Endangered and Threatened Wildlife and Plants; 12-Month Finding for Petitions To List the Greater Sage-Grouse as Threatened or Endangered, 2244-2282 [05-583]
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Federal Register / Vol. 70, No. 8 / Wednesday, January 12, 2005 / Proposed Rules
DEPARTMENT OF THE INTERIOR
Fish and Wildlife Service
50 CFR Part 17
Endangered and Threatened Wildlife
and Plants; 12-Month Finding for
Petitions To List the Greater SageGrouse as Threatened or Endangered
Fish and Wildlife Service,
Interior.
ACTION: Notice of a 12-month petition
finding.
AGENCY:
SUMMARY: We, the U.S. Fish and
Wildlife Service (Service), announce a
12-month finding for three petitions to
list the greater sage-grouse
(Centrocercus urophasianus) as
threatened or endangered under the
Endangered Species Act of 1973, as
amended. After reviewing the best
available scientific and commercial
information, we find that listing is not
warranted. We ask the public to submit
to us any new information that becomes
available concerning the status of or
threats to the species. This information
will help us monitor and encourage the
conservation of this species.
DATES: The finding announced in this
document was made on January 6, 2005.
Although further listing action will not
result from this finding, we request that
you submit new information concerning
the status of or threats to this species
whenever it becomes available.
ADDRESSES: Comments and materials
received, as well as supporting
documentation used in the preparation
of this 12-month finding, will be
available for inspection, by
appointment, during normal business
hours at the Wyoming Ecological
Services Field Office, U.S. Fish and
Wildlife Service, 4000 Airport Parkway,
Cheyenne, Wyoming 82001. Submit
new information, materials, comments,
or questions concerning this species to
the Service at the above address.
FOR FURTHER INFORMATION CONTACT: The
Wyoming Field Office (see ADDRESSES
section above), by telephone at (307)
772–2374, by facsimile at (307) 772–
2358, or by electronic mail at
fw6_sagegrouse@fws.gov.
SUPPLEMENTARY INFORMATION:
Background
Section 4(b)(3)(B) of the Endangered
Species Act of 1973, as amended (Act)
(16 U.S.C. 1531 et seq.), requires that,
for any petition to revise the Lists of
Threatened and Endangered Wildlife
and Plants that contains substantial
scientific or commercial information
that the action may be warranted, we
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make a finding within 12 months of the
date of the receipt of the petition on
whether the petitioned action is: (a) Not
warranted, (b) warranted, or (c)
warranted but precluded by other
pending proposals. Such 12-month
findings are to be published promptly in
the Federal Register.
On July 2, 2002, we received a
petition from Craig C. Dremann
requesting that we list the greater sagegrouse (Centrocercus urophasianus) as
endangered across its entire range. We
received a second petition from the
Institute for Wildlife Protection on
March 24, 2003 (Webb 2002) requesting
that the greater sage-grouse be listed
rangewide. On December 29, 2003, we
received a third petition from the
American Lands Alliance and 20
additional conservation organizations
(American Lands Alliance et al.) to list
the greater sage-grouse as threatened or
endangered rangewide. On April 21,
2004, we announced our 90-day petition
finding in the Federal Register (69 FR
21484) that these petitions taken
collectively, as well as information in
our files, presented substantial
information indicating that the
petitioned actions may be warranted. In
accordance with section 4(b)(3)(A) of
the Act, we have now completed a
status review of the best available
scientific and commercial information
on the species, and have reached a
determination regarding the petitioned
action.
This status review of the greater sagegrouse does not address our prior
finding with regard to the Columbia
Basin distinct population segment
(DPS). On May 7, 2001, we published a
12-month finding on a petition to list
the Washington population of the
western subspecies of the greater sagegrouse as a distinct population segment
(DPS) (66 FR 22984). Our finding
included a summary of the historic
distribution of what we then considered
to be the western subspecies of the
greater sage-grouse (see ‘‘Species
Information’’ below regarding
taxonomy). In our finding we
determined that the population segment
that remains in central Washington met
the requirements of our policy for
recognition as a distinct population
segment (61 FR 4722) and that listing
the DPS was warranted but precluded
by other higher priority listing actions.
Because the population in central
Washington occurs entirely within the
historic distribution of sage-grouse
within the Columbia Basin ecosystem,
we referred to it as the Columbia Basin
DPS (66 FR 22984; May 7, 2001). In
subsequent candidate notices of review
(CNORs), including the most recent one
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published in the Federal Register on
May 4, 2004 (69 FR 24875), we found
that a listing proposal for this DPS was
still warranted but precluded by higher
priorities. Since that time new
information has become available
through this status review of the greater
sage-grouse. We will use the best
scientific and commercial information
available (including, but not limited to
information that became available
during this rangewide status review) to
reevaluate whether the Columbia Basin
population still qualifies as a DPS under
our DPS policy, and if it does, whether
the DPS still warrants a listing proposal.
Once that evaluation is completed, we
will publish an updated finding for the
Columbia Basin population in the
Federal Register either in the next
CNOR or in a separate notice.
Responses to Comments Received
We received 889 responses to our
request for additional information in our
90-day finding for the greater sagegrouse (69 FR 21484). Those responses
which contained new, updated, or
additional information were thoroughly
considered in this 12-month finding. We
received a large number of identical or
similar comments. We consolidated the
comments into several categories, and
provide responses as follows.
Comment 1: It is premature for the
Service to consider listing the sagegrouse until the impact of local and
State conservation efforts are realized.
Response 1: The Service is required
under section 4 of the Act to determine
whether or not listing is warranted
within 12 months of receiving a petition
to list a species. By publishing a
positive 90-day finding in April, 2004
(69 FR 21484), we were required by the
Act to immediately proceed with the
completion of a 12-month finding. We
have examined ongoing and future
conservation efforts in our status
review. This included using our Policy
for Evaluation of Conservation Efforts
When Making Listing Decisions
(‘‘PECE’’) (68 FR 15100; March 28, 2003)
to evaluate conservation efforts by State
and local governments and other
entities that have been planned but have
not been implemented, or have been
implemented but have not yet
demonstrated effectiveness, to
determine which such efforts met the
standard in PECE for contributing to our
finding. Our analysis of the best
available scientific data revealed that
the greater sage-grouse is not a
threatened species, and in making this
finding it was not necessary to rely on
the contributions of any of the local,
State, or other planned conservation
efforts that met the standard in PECE. A
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summary of our process with regard to
PECE is provided in the section ‘‘Status
Review Process,’’ below.
Comment 2: Listing the sage-grouse
could have a negative impact on the
conservation efforts being implemented
by States for this species.
Response 2: We appreciate the fact
that prior to acceptance of the listing
petitions, States within the range of the
greater sage-grouse are fully engaged in
developing and implementing
conservation efforts for this species, and
we encourage them to continue these
efforts. Conservation actions which have
already been implemented have been
considered in this decision. However,
our determination regarding whether or
not this species warrants listing under
the Act must be based on our
assessment of population status and
threats to the species, the species’
population status, and the status and
trend of the species’ habitat as they are
known at the time of the decision.
Comment 3: The facts do not support
the need for listing this species.
Response 3: The Service has
considered all factors potentially
affecting the greater sage-grouse in our
decision and agree that the listing is not
warranted. We have made our decision
based on the best available scientific
and commercial data, as required by the
Act.
Comment 4: In most western states,
sage-grouse populations have been fairly
steady and in some cases, increasing
over the past decade.
Response 4: The Service has
considered population trends in all
States and Provinces, and across the
entire range of the species in our status
review, including localized increases.
Comment 5: Locally managed efforts
are best suited to preserve and protect
the greater sage-grouse.
Response 5: We acknowledge that
local conservation efforts for this
species are important to long-term
conservation, particularly given the
widespread distribution and the variety
of habitats and threats. However, most
of these efforts have not yet been
implemented, or have not been
demonstrated to be effective.
Conservation actions that have already
been implemented and for which
effectiveness is known have been
considered in this decision. Our
determination of whether or not this
species warrants listing under the Act
must be based on our assessment of the
threats to the species, the species’
population status, and the status and
trend of the species’ habitat as they are
known at the time of the decision. There
is no one best strategy for sage-grouse
conservation and we encourage the
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continuation of all conservation efforts
to conserve the greater sage-grouse. The
Service continues to support the
development of a Conservation Strategy
for the Greater Sage-grouse by Western
Association of Fish and Wildlife
Agencies (WAFWA), and supports
voluntary conservation as the most
effective method to protect species and
their habitats.
Comment 6: The recovery process
under the Endangered Species Act has
a very low success rate.
Response 6: Our decision regarding
the greater sage-grouse is a listing, not
a recovery decision. Our determination
regarding whether or not this species
warrants listing under the Act must be
based on our assessment of the threats
to the species, the species’ population
status, and the status and trend of the
species’ habitat as they are known at the
time of the decision, not its potential for
recovery under the Act. Therefore, this
comment may not be considered in this
finding.
Comment 7: If the greater sage-grouse
is listed there will be a reduction of
freedom and private property rights and
public land use, and therefore a negative
impact on the country. Listing the
grouse will also result in economic
damage to many entities.
Response 7: Our decision regarding
the greater sage-grouse is based on the
best available scientific and commercial
data, as required by the Act. Our
determination regarding whether or not
this species warrants listing must be
based on our assessment of the threats
to the species, the species’ population
status, and the status and trend of the
species’ habitat as they are known at the
time of the decision, not the potential
social or economic implications of
listing. Therefore, this comment may
not be considered in this finding.
Comment 8: There will be a loss of
management options for the greater
sage-grouse if this species is listed.
Response 8: We are not aware of any
management options that are beneficial
to the greater sage-grouse that would
need to be eliminated if this species is
listed under the Act-an action we
believe to be not warranted at this time.
Comment 9: Listing the greater sagegrouse will divide and polarize local
communities.
Response 9: Our decision regarding
the greater sage-grouse is based on the
best available scientific and commercial
data, as required by the Act. Our
determination regarding whether or not
this species warrants listing under the
Act must be based on our assessment of
the threats to the species, the species’
population status, and the status and
trend of the species’ habitat as they are
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known at the time of the decision, not
the potential socio-political
implications of listing. Therefore, this
comment may not be considered in this
finding.
Comment 10: Listing the greater sagegrouse will increase the workload for
the U.S. Fish and Wildlife Service.
Response 10: Our decision regarding
the greater sage-grouse is based on the
best available scientific and commercial
data, as required by the Act. Our
determination regarding whether or not
this species warrants listing under the
Act must be based on our assessment of
the threats to the species, the species’
population status, and the status and
trend of the species’ habitat as they are
known at the time of the decision, not
the potential increase in workload for
the Service. Therefore, this comment
may not be considered in this finding.
Comment 11: Listing the greater sagegrouse will result in Federal budget
limitations for other Federal agencies
and projects.
Response 11: Our decision regarding
the greater sage-grouse is based on the
best available scientific and commercial
data, as required by the Act. Our
determination regarding whether or not
this species warrants listing under the
Act must be based on our assessment of
the threats to the species, the species’
population status, and the status and
trend of the species’ habitat as they are
known at the time of the decision, not
the potential implications for the
Federal budget of listing. Therefore, this
comment may not be considered in this
finding.
Comment 12: Conservation planning
efforts and current Federal agency
actions are sufficient to conserve the
greater sage-grouse.
Response 12: We acknowledge that
many Federal agencies are
implementing conservation measures
for the greater sage-grouse, and that
several conservation efforts for this
species are underway. Current federal
conservation efforts have been reviewed
and considered in our analysis. We
evaluated planned conservation efforts
under PECE (see Response 1); most of
the planned conservation efforts for the
greater sage-grouse have not yet been
implemented. However, because our
analysis of the best available scientific
and commercial data revealed that the
greater sage-grouse is not warranted for
listing under the ESA, it was not
necessary to evaluate whether the
planned conservation efforts that met
PECE reduced the threats to the species.
Comment 13: The petition was
subjected to an independent analysis
and serious problems were found with
the science.
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Response 13: Our 90-day finding was
based on the determination that the
three petitions submitted met the
‘‘substantial information’’ threshold as
defined under section 4(b)(3)(A) of the
Act. At the time of the 90-day finding,
we did acknowledge that two of the
three petitions contained some
misstatements (69 FR 21484). However,
the petitions were only one information
source of many we used in our review
for the 90-day finding. For the current
12-month finding, we conducted an
exhaustive review of the scientific
literature, and included State, industry,
and Federal agency data. This finding
does not rely on the petitions, but rather
the best scientific and commercial data
available, as required by the Act.
Comment 14: The Western Governor’s
Association report provides additional
information which should be
considered.
Response 14: The Western Governor’s
Association report was considered in
this finding.
Comment 15: Many private sector
groups are taking steps to protect sagegrouse habitat.
Response 15: We acknowledge that
local conservation efforts for this
species are important to long-term
conservation and strongly support the
continuation of these efforts. Most of the
planned conservation efforts for the
greater sage-grouse have not yet been
implemented. As explained above, in
making this finding it was not necessary
to rely on the contributions of any of the
local, State, or other planned
conservation efforts that met the
standard in PECE (see Response 1).
Comment 16: Scientific reports
detailing the sage-grouse’s decline
consistently declare more work is
necessary to adequately assess the status
of sage-grouse populations.
Response 16: We agree that additional
information on populations would be
useful. However, as required by the Act,
the Service must use the best scientific
and commercial information available
when making a 12-month finding. The
law does not provide a mechanism for
the Service to improve the available
information.
Comment 17: Hunting is allowed in
most states and provides a benefit to
hunters and state wildlife programs
without a negative impact on sagegrouse populations.
Response 17: At this time, it is
unclear what area-specific impacts sagegrouse hunting has on sage-grouse
populations. Most States are currently
managing their populations in
conformance with the WAFWA
guidelines, which contain the most upto-date guidelines for sage-grouse
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management. Our review indicated that
regulated hunting of sage-grouse does
not pose a threat that would lead to the
likely endangerment of the species in
the foreseeable future.
Comment 18: Now that there is a
coordinated effort to further protect the
species, there is no reason to suspect
that this progress will not continue.
Response 18: We acknowledge that
many Federal, State, and local working
groups are implementing protective
measures for the greater sage-grouse,
and that several conservation efforts for
this species are underway, have been
planned, or are in the process of being
planned. Most of the planned
conservation efforts for the greater sagegrouse have not yet been implemented.
As explained above, in making this
finding it was not necessary to rely on
the contributions of any of the local,
State, or other planned conservation
efforts that met the standard in PECE
(see Response 1). We strongly encourage
continued efforts to preserve and protect
the greater sage-grouse and its habitat.
Comment 19: The Conservation
Assessment of Greater Sage-grouse and
Sagebrush Habitats provides additional
information which should be
considered.
Response 19: The Conservation
Assessment of Greater Sage-grouse and
Sagebrush Habitats report was
considered in this finding.
Comment 20: The worst possible
outcome is to list the sage-grouse.
Response 20: Our determination of
whether or not this species warrants
listing under the Act must be based on
our assessment of the threats to the
species, the species’ population status,
and the status and trend of the species’
habitat as they are known at the time of
the decision. We strongly encourage all
efforts to conserve the greater sagegrouse and its habitat.
Comment 21: Predators are causing
the decline of sage-grouse.
Response 21: We have considered the
effects of predators and predator control
in our sage-grouse analysis.
Comment 22: We need to consider the
effects of hunting on sage-grouse.
Response 22: We have considered the
effects of hunting in our sage-grouse
analysis.
Comment 23: Sage-grouse are doing
well in some areas and therefore, they
should not be listed in those areas. Also,
the Service should consider the need to
list sage-grouse on a state-by-state basis.
Response 23: The petitions requested
that we determine if the species needed
to be listed across its entire range.
Therefore, we have to consider the sagegrouse population range-wide.
Additionally, our Policy Regarding the
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Recognition of Distinct Vertebrate
Populations (61 FR 4722) requires that
in order to consider separate
populations within a species for listing
under the Act, such populations must
(1) be discrete in relation to the
remainder of the species to which it
belongs, and (2) have biological and
ecological significance for the taxon. We
have received no information that
suggests any population of the greater
sage-grouse is isolated from conspecific
populations, with the exception of the
Columbia Basin population in central
Washington. As described above, we
previously determined that a proposal
to list the Columbia Basin distinct
population segment is warranted but
precluded by other higher priority
listing actions (66 FR 22984), and in the
near future we will reevaluate that
determination to consider new
information, including (but not limited
to) information available as a result of
this status review and finding on
petitions to list the greater sage-grouse.
Comment 24: Drought and other
weather conditions have had a major
effect on sage-grouse populations.
Response 24: We acknowledge that
drought and other weather conditions
are a natural occurrence in the west and
we have considered the effects of
drought in our sage-grouse analysis.
Comment 25: It was interesting to see
flocks of dozens of grouse near fences,
since conventional wisdom sees fences
as perches for raptors and hence areas
of avoidance for raptor-wary grouse.
Response 25: We acknowledge that
raptors do use fences as perch sites.
Sage-grouse tend to avoid perch sites
like fences but threats of raptors do not
totally exclude sage-grouse use of
habitat near fences.
Comment 26: The size of sage-grouse
populations can be affected by habitat
condition.
Response 26: We acknowledge that
habitat conditions can affect local sagegrouse numbers. We have considered
this information in the finding.
Comment 27: Disease is a natural
event that may be negatively affecting
sage-grouse.
Response 27: We have considered the
effects of disease on greater sage-grouse
in this finding. As identified in the Act,
it is one of the threat factors we are
required to consider in our status
review.
Comment 28: Listing the greater sagegrouse will remove the flexibility of
local planning efforts.
Response 28: We recognize that listing
may affect local planning efforts, due to
its effect on voluntary conservation
efforts. However, we may not consider
those effects under this status review.
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Comment 29: Maintaining and
improving habitat is the answer to
increasing sage-grouse numbers.
Response 29: We concur that
maintaining habitat is important for the
long-term conservation of the greater
sage-grouse. We strongly encourage
efforts to conserve sage-grouse and
sagebrush habitat.
Comment 30: Greater sage-grouse
numbers and distribution have
significantly declined since 1900.
Response 30: The information
pertaining to the status and distribution
of the greater sage-grouse has been
reviewed and incorporated in our
analysis. Sage-grouse abundance has
been scientifically documented as
declining since the 1950s, but the rate
of decline has decreased since the 1980s
and in some places has stabilized, or
even increased.
Comment 31: Destructive land use
practices and management on public
and private lands are negatively
affecting the greater sage-grouse.
Response 31: We have considered the
effects of various uses of private and
public lands on the status of the greater
sage-grouse in this finding.
Comment 32: Negative impacts to the
greater sage-grouse continue irrespective
of efforts by State and local working
groups.
Response 32: Most State and local
working group conservation efforts for
the greater sage-grouse have not yet
been implemented, and the certainty of
implementation and effectiveness of
such efforts is unclear. However, we
have considered all conservation efforts
which have been implemented and
shown to be effective. As explained
above, in making this finding it was not
necessary to rely on the contributions of
any of the local, state, or other planned
conservation efforts that met the
standard in PECE (see Response 1).
Comment 33: Listing the sage-grouse
would affect much-needed land
management reform.
Response 33: Our decision regarding
the greater sage-grouse is based on the
best available scientific and commercial
data, as required by the Act. Our
determination regarding whether or not
this species warrants listing under the
Act must be based on our assessment of
the threats to the species, the species’
population status, and the status and
trend of the species’ habitat as they are
known at the time of the decision, not
the potential land management
implications of listing. Therefore, this
comment may not be considered in this
finding.
Comment 34: The ESA requires that
listing decisions be based solely on the
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best science and biological information
about the species and its habitats.
Response 34: Our decision regarding
the greater sage-grouse is based on the
best available scientific and commercial
data, as required by the Act.
Comment 35: Meaningful regulatory
mechanisms are non-existent and
existing management is inadequate to
conserve the bird.
Response 35: We have considered
existing regulatory mechanisms and
management activities in this finding.
Comment 36: Only listing the greater
sage-grouse under the Endangered
Species Act will save the birds and its
habitat.
Response 36: Our determination of
whether or not this species warrants
listing under the Act must be based on
our assessment of the threats to the
species, the species’ population status,
and the status and trend of the species’
habitat as they are known at the time of
the decision. We strongly encourage all
efforts to conserve the greater sagegrouse and its habitat.
Comment 37: Listing the greater sagegrouse would benefit a variety of other
sagebrush obligates and sagebrushdependent species.
Response 37: This finding is for the
greater sage-grouse only. Therefore, we
cannot consider the potential impact of
listing the greater sage-grouse on the
status of other sagebrush-dependent
species in our decision.
Comment 38: The WAFWA
Conservation Assessment is disturbing
in that its findings show a wide
discrepancy in how States monitor
greater sage-grouse.
Response 38: The WAFWA
Conservation Assessment represents one
component of the best available
scientific and commercial data that we
used in our analysis, as required by the
Act. The fact that the States vary
somewhat in how they conduct
monitoring of this species was
considered in this finding.
Comment 39: The loss of small
populations of sage-grouse increases the
species’ risk of extinction when the
species occurs primarily in spread out,
island-like patches of habitat.
Response 39: We have considered the
effects of small population sizes and
isolated populations in our finding.
Comment 40: Current regulatory
frameworks are sufficient to protect the
greater sage-grouse.
Response 40: We have considered
existing regulatory mechanisms and
management activities in this finding
and determined that existing regulatory
protections in combination with the
existing threats do not warrant listing
the greater sage-grouse range-wide.
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Comment 41: Grazing is good for sagegrouse. Improvements to grazing
practices have been positive for sagegrouse.
Response 41: We have considered all
aspects of grazing impacts on the greater
sage-grouse in our finding.
Comment 42: Listing the greater sagegrouse will curtail energy development.
Response 42: Our decision regarding
the greater sage-grouse is based on the
best available scientific and commercial
data, as required by the Act. Our
determination regarding whether or not
this species warrants listing under the
Act must be based on our assessment of
the threats to the species, the species’
population status, and the status and
trend of the species’ habitat as they are
known at the time of the decision, not
the potential land management
implications of listing. We did evaluate
the threat of energy development to
greater sage-grouse in this finding.
Comment 43: ESA is prohibitively
expensive to implement.
Response 43: Our decision regarding
the greater sage-grouse is based on the
best available scientific and commercial
data, as required by the Act. Our
determination regarding whether or not
this species warrants listing under the
Act must be based on our assessment of
the threats to the species, the species’
population status, and the status and
trend of the species’ habitat as they are
known at the time of the decision, not
the potential cost of listing. Therefore,
this comment may not be considered in
this finding.
Comment 44: There is adequate
funding available for future
conservation efforts for the greater sagegrouse.
Response 44: We evaluated the
certainty of funding for future
conservation efforts as part of our
evaluation of efforts that were subject to
PECE. We encourage the continued
implementation of conservation efforts
for the greater sage-grouse.
Comment 45: We have additional
information for your analysis.
Response 45: All relevant additional,
new, or updated information received in
comments submitted was thoroughly
considered in this 12-month finding.
Comment 46: We have information
regarding proposed actions for your
analysis.
Response 46: We have examined
proposed actions, consistent with PECE
(68 FR 15100) in our status review. Our
analysis of the best available scientific
and commercial data revealed that
listing the greater sage-grouse as
threatened or endangered is not
warranted, and in making this finding it
was not necessary to rely on the
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contribution of any of the local, State, or
other planned conservation efforts that
met the standard in PECE (see Response
1).
Comment 47: The Service’s 90-day
finding did not consider all available
information.
Response 47: For a 90-day finding, we
are required to review the information
in the petition(s), our files, and any
information provided by States and
Tribes. Based upon this information, the
Service determines whether there is
substantial information indicating that
further review is necessary. We are
required to consider the best available
scientific and commercial data in our
12-month status review. This finding
represents our conclusions based on
that information.
Comment 48: Falconers take very few
sage-grouse. They are a preferred
species for only one extremely
specialized form of falconry.
Response 48: We have considered this
information in our analysis.
Comment 49: If the Service
determines that listing the sage-grouse is
appropriate, they will have to designate
critical habitat.
Response 49: Our decision regarding
the greater sage-grouse is based on the
best available scientific and commercial
data, as required by the Act. Our
determination regarding whether or not
this species warrants listing under the
Act must be based on our assessment of
the threats to the species, the species’
population status, and the status and
trend of the species’ habitat as they are
known at the time of the decision. We
designate critical habitat for listed
species as required by the Act.
Comment 50: The Service must
consider the status of the sage-grouse
across the entirety of its range.
Response 50: We have considered the
status of the greater sage-grouse across
the entirety of its range, as petitioned.
Comment 51: We do not believe that
the designation of the Washington
population of sage-grouse as a Distinct
Population Segment (DPS) is
appropriate.
Response 51: This status review of the
greater sage-grouse does not address our
prior finding with regard to the
Columbia Basin distinct population
segment (DPS). New information which
has become available through this status
review of the greater sage-grouse will be
considered when we re-evaluate the
status of the Columbia Basin
population, either through an updated
finding or in the next Candidate Notice
of Review.
Comment 52: Managing agencies lack
Best Management Practices due to the
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lack of support, manpower, and
funding.
Response 52: We acknowledge that
the extent of support, manpower, and
funding may influence some aspects of
the implementation of Best Management
Practices (BMPs) for sage-grouse. As
currently described, most BMPs are very
broadly stated mitigation measures that
involve incorporating project design
features when various resource
management activities are planned, in
order to reduce or avoid impacts to
species.
Comment 53: Industry has
implemented many mitigation and
protection measures for sage-grouse.
Response 53: We acknowledge that
industries are implementing some
mitigation and protective measures for
sage-grouse. We evaluated all such
information that was available to us. We
strongly encourage the continuation of
all efforts to conserve the greater sagegrouse and its habitat.
Comment 54: Listing the sage-grouse
could have profound impacts on a
number of military facilities.
Response 54: Our decision regarding
the greater sage-grouse is based on the
best available scientific and commercial
data, as required by the Act. Our
determination regarding whether or not
this species warrants listing under the
Act must be based on our assessment of
the threats to the species, the species’
population status, and the status and
trend of the species’ habitat as they are
known at the time of the decision, not
the potential impact of listing on
military facilities. Therefore, this
comment may not be considered in this
finding.
Comment 55: Loss of habitat to
cheatgrass and juniper invasion are
major threats to sage-grouse habitat. The
technologies and know-how exist to
eliminate or reduce the cheatgrass and
juniper invasion trends.
Response 55: We acknowledge that
cheatgrass and juniper invasions are
threats to sage-grouse habitats.
Currently, technologies have been
developed or are being developed to
treat problems of cheatgrass and juniper
invasions. Our review found mixed
results in the current technologies’
ability to treat cheatgrass and juniper
problems.
Comment 56: Historic declines and
habitat loss are not relevant to the
current listing decision.
Response 56: Our decision regarding
the greater sage-grouse is based on the
best available scientific and commercial
data, as required by the Act. Our
determination regarding whether or not
this species warrants listing under the
Act must be based on our assessment of
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the threats to the species, the species’
population status, and the status and
trend of the species’ habitat as they are
known at the time of the decision,
including information on historic
declines and habitat loss to the extent
that they contribute to current threats.
Comment 57: There is no peerreviewed science to support a listing.
Response 57: We have reviewed
scientific, peer-reviewed literature in
our analysis, as well as commercial and
unpublished data. The cumulative
review of this information was used to
determine if the greater sage-grouse
warrants listing under the Endangered
Species Act.
Comment 58: Most sage-grouse habitat
loss due to agriculture (i.e., conversion
to cropland, seeding to crested
wheatgrass, etc.) has been eliminated or
greatly reduced. Large-scale conversions
to agriculture are decreasing.
Response 58: We acknowledge that
there have been changes in the rate of
loss of sage-grouse habitat due to
various agricultural conversions. We
have considered this information in our
analysis.
Comment 59: The Service must
consider all listing factors when making
a determination.
Response 59: Our determination
regarding whether or not this species
warrants listing under the Act must be
based on our assessment of the threats
to the species, the species’ population
status, and the status and trend of the
species’ habitat as they are known at the
time of the decision. We consider the
effects of all threats on the status of the
species when we make our
determination.
Comment 60: Present habitat provides
the necessary elements to sustain a
highly viable sage-grouse population.
Response 60: We have considered
existing habitat conditions for the
greater sage-grouse throughout its range
in this finding.
Comment 61: There is insufficient
funding available to adequately fund
existing and proposed conservation
plans for the greater sage-grouse.
Response 61: We have examined
ongoing and future conservation efforts
in our status review. We have examined
proposed actions, consistent with PECE
(68 FR 15100), in our status review, and
this included consideration of funding,
consistent with one of the criteria in
PECE. (See also Response 1, above).
Comment 62: Wildfire is a threat to
sage-grouse habitat and can result in
habitat elimination across the species’
range.
Response 62: We have considered the
effects of wildfire on sage-grouse habitat
in this finding.
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Information Quality Act
In addition to the comments received,
two Information Quality Act challenges
were submitted. The challenge received
from the Partnership for the West was
addressed through a response directly to
that organization. The second challenge
from the Owyhee County
Commissioners (Idaho) primarily stated
that we failed to conduct an exhaustive
search of all scientific literature, and
other information in the completion of
our 90-day finding. Section 4(b)(3)(A) of
the Act only requires that the petitions
present ‘‘substantial scientific or
commercial information indicating that
the petitioned action may be
warranted.’’ The Act does not require an
exhaustive search of all available
information at that time. Other concerns
identified in the Owyhee County
Commissioner’s challenge are addressed
in our comment responses above, and
an overall summary regarding the steps
we have taken to ensure conformance
with our Information Quality Guidelines
is provided below.
The Service’s Information Quality
Guidelines define quality as an
encompassing term that includes utility,
objectivity, and integrity. Utility refers
to the usefulness of the information to
its intended users, including the public.
Objectivity includes disseminating
information in an accurate, clear,
complete, and unbiased manner and
ensuring accurate, reliable, and
unbiased information. If data and
analytic results have been subjected to
formal, independent, external peer
review, we generally will presume that
the information is of acceptable
objectivity. Integrity refers to the
security of information—protection of
the information from unauthorized
access or revision, to ensure that the
information is not compromised
through corruption or falsification.
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The Service conducted a thorough
pre-dissemination review of the data it
is relying on to make this 12-month
finding. In particular, the Service used
the information in the WAWFA
Conservation Assessment, which is a
peer-reviewed science document. The
WAWFA assessment was based on data
provided by the states, provinces, land
management agencies, as well as data in
published, peer-reviewed manuscripts
and other verified sources available to
the authors of the assessment. The draft
final assessment was reviewed by State
agency wildlife biologists to ensure that
data submitted by each State were
presented accurately and completely.
The assessment also was peer reviewed
by an independent group of scientists
selected by the Ecological Society of
America. These reviewers were experts
from academia, government, and nongovernmental organizations, and
included researchers as well as wildlife
managers.
The WAWFA Conservation
Assessment assembles in one place
almost all of the available pertinent data
that addresses the current biological and
ecological condition of the sage-grouse
and its habitat. This compilation of
material allows the public to see a large
body of information all in one
document, making the information more
useful than the many separate sources of
information would be. Since the
document has been subject to an
independent, external peer review, the
Service believes it is of acceptable
objectivity. For these reasons the
Service believes this information meets
our Information Quality Guidelines.
Status Review Process
Section 4(b)(1)(A) of the Act requires
us to consider the best scientific and
commercial data available as well as
efforts being made by States or other
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entities to protect a species when
making a listing decision. To meet this
standard we systematically collected
information on the greater sage-grouse,
its habitats, and environmental factors
affecting the species, from a wide array
of sources. The scientific literature on
greater sage-grouse and sagebrush
habitats is extensive. In addition we
received a substantial amount of
unpublished information from other
Federal agencies, States, private
industry and individuals. We also
solicited information on all Federal,
State, or local conservation efforts
currently in operation or planned for
either the greater sage-grouse or its
habitats.
The current distribution of greater
sage-grouse and sagebrush habitat
encompasses parts of 11 states in the
western United States and 2 Canadian
provinces (Figure 1). This large
geographical scale combined with major
ecological differences in sagebrush
habitat and myriad of activities
occurring across this large area required
that the Service employ a structured
analysis approach. Given the very large
body of information available to us for
our decision, structuring our analysis
ensured we could explicitly assess the
relative risk of changes occurring across
the range of the sage-grouse, and
integrate those individual assessments,
be they regional or rangewide in nature,
into an estimate of the probability that
sage-grouse would go extinct at defined
timeframes in the future. Using such
extinction risk analysis to frame listing
decisions under the Act has been
recommended (National Research
Council 1995), and was adopted by the
Service as an important component of a
structured analysis of the status review
of the greater sage-grouse.
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As part of the structuring of this status
review, the Service compiled from the
best scientific and commercial data
available a summary of the changes or
impacts occurring to the sagebrush
ecosystem that could potentially affect
the sage-grouse directly or indirectly.
This summary, or synthesis of biological
information, was one of many sources of
information provided to a panel of
seven experts, who, through a two-day
facilitated process discussed threats to
the species and each generated an
estimate of extinction risk for the greater
sage-grouse at different timeframes in
the future. This information and all
other available information were then
considered by Service biologists and
managers to frame a listing
recommendation, and ultimately the
decision reported in this finding.
Expert panels are not a required
component of structured analysis but
are used to help inform decision makers
when there is uncertainty (National
Research Council 1995). Typically, this
uncertainty is due to a lack of
information. While the scientific
information on greater sage-grouse and
their habitats is extensive, substantial
gaps and uncertainty remain in the
scientific community’s knowledge of all
the factors that may affect sage-grouse
populations across such a wide
geographical range encompassing major
ecological differences in sagebrush
habitats. Further, scientific knowledge
of how the species may respond to those
factors over time is incomplete. For
these reasons, we requested input from
scientific experts outside the Service to
help us make a reasonable projection of
the species’ potential extinction risk.
The panel consisted of experts in sagegrouse biology and ecology, sagebrush
community ecology, and range ecology
and management.
The organization of this finding
reflects this basic approach. We first
describe in more detail the structured
process; present a summary of the
threats to the species organized
according to the 5 listing factors in the
Act; then we present results from the
facilitated expert panel process,
including estimates of extinction risk;
and finally present how a team of
Service biologists and managers
interpreted the extinction risk analysis,
the threat ranking of the expert
panelists, and other available
information in the context of a listing
decision under the Act. In order to
ensure that the process we used to reach
our finding is transparent, discussion of
the biological significance of each threat
listed under the 5 listing factors, and the
geographical scale at which they affect
sage-grouse is based on results of the
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expert panel and decision support team
process. A thorough description of this
process and its results is presented later
in the finding along with the decision
support team’s evaluation of the threats
in the context of a listing decision under
the Act. However, we felt it was
important to include a brief discussion
of the spatial and biological significance
of each threat as they are presented by
listing factor.
Following compilation of the best
available scientific and commercial
information, which is summarized in
other sections of this finding and
available in full in our administrative
record, we conducted three phases of
information synthesis and evaluation.
First, the information on individual
planned conservation efforts was
evaluated under PECE to determine
which efforts met the following
standard in PECE: ‘‘To consider that a
formalized conservation effort(s)
contributes to forming a basis for not
listing a species or listing a species as
threatened rather than endangered, we
must find that the conservation effort is
sufficiently certain to be implemented
and effective so as to have contributed
to the elimination or adequate reduction
of one or more threats to the species
identified through the section 4(a)(1)
analysis’’ (see 68 FR 15115). Second, we
completed a structured analysis of
greater sage-grouse extinction risk
including the evaluation of all factors
that may be contributing to the species’
population trends and the likelihood of
the species’ extinction at various
timeframes into the future. Finally, we
evaluated whether the available
information on status, trends, ongoing
conservation efforts, and potential
extinction risk indicate that the greater
sage-grouse should be listed as a
threatened or endangered species. We
further structured these three phases by
differentiating two distinct stages of the
status review: (1) A risk analysis phase
which consisted of compiling biological
information, conducting the PECE
analysis, and assessing the risk of
extinction of greater sage-grouse, and (2)
a risk management phase where a
decision support team of senior Service
biologists and managers evaluated
whether or not the potential threats
identified as part of our section 4(a)(1)
analysis, and summarized in this
finding, are significant enough to
qualify the greater sage-grouse as a
threatened or endangered species under
the Act.
For the PECE analysis, we received
and reviewed 27 plans, or conservation
strategies, outlining more than 300
individual efforts. Most of the plans
were from States, but we also received
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information from the Department of
Energy (DOE), Bureau of Land
Management (BLM), U.S. Forest Service
(USFS), Department of Defense (DOD),
Natural Resources Conservation Service
(NRCS), Western Governor’s Association
(WGA), and the North American Grouse
Partnership (NAGP).
Each effort within each plan was
evaluated under PECE, which provides
a framework and criteria for evaluating
conservation efforts that have not yet
been implemented or have not yet
demonstrated whether they are effective
at the time of a listing decision.
Recognizing that the certainty of
implementation and effectiveness of
various efforts within a conservation
plan, strategy, or agreement may vary,
PECE requires that we evaluate each
effort individually, and the policy
provides criteria to direct our analysis.
PECE specifies that ‘‘Those conservation
efforts that are not sufficiently certain to
be implemented and effective cannot
contribute to a determination that listing
is unnecessary or a determination to list
as threatened rather than endangered’’
(see 68 FR 15115). As described above,
when determining whether or not a
species warrants listing, with regard to
conservation efforts that are subject to
PECE we may only consider those
efforts that we are sufficiently certain to
be implemented and effective so as to
have contributed to the elimination or
reduction of one or more threats to the
species. Using the criteria provided in
PECE, we determined that 20 of the
individual efforts we evaluated met the
standard for being sufficiently certain to
be implemented and effective in
reducing threats. Hence, we included
those 20 efforts in the information used
for the extinction risk evaluation.
The expert panelists participated
together in a series of facilitated
exercises and discussions addressing
first the species’ inherent biological
vulnerability and resilience, then the
potential, relative influence of extrinsic
or environmental factors on
populations, and finally the experts’
projections of extinction risk at different
geographical scales both with and
without the 20 planned conservation
efforts from the PECE analysis. The
Service would only consider the effect
of the conservation efforts that met
PECE in our decision if our review of
the best available scientific and
commercial data revealed that listing
the greater sage-grouse under the Act
was warranted. The experts participated
only in the assessment of biological and
environmental factors and related
extinction risk without any
consideration or discussion of the
petition or regulatory classification of
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the species. Structuring of the
assessment facilitated thorough and
careful deliberation by the experts and
observing Service biologists and
managers on the decision support team,
including clarification of what
information was critical to forming the
experts’ views of, where knowledge
gaps and areas of uncertainty exist, and
confidence experts felt in the biological
judgments they expressed. Structuring
also facilitated independent
contributions from the experts.
In the final status review stage,
following the compilation of biological
information, PECE analysis of
conservation efforts, and the facilitated
extinction risk assessment by the expert
panel, Service biologists and managers
met and conducted a separate facilitated
process to assess whether or not the
threats to the greater sage-grouse
described in this finding were
significant enough at this time to meet
the definition of a threatened or
endangered species under the Act.
Specific results from both the facilitated
risk analysis stage of the status review
and the facilitated risk management
stage of the status review are presented
later in the finding to clarify how the
Service reached its decision. The
Service’s finding considered all of the
available information on record.
Species Information
The sage-grouse is the largest North
American grouse species. Adult males
range in length from 66 to 76
centimeters (cm) (26 to 30 inches (in))
and weigh between 2 and 3 kilograms
(kg) (4 and 7 pounds (lb)). Adult females
range in length from 48 to 58 cm (19 to
23 in) and weigh between 1 and 2 kg (2
and 4 lb). Males and females have dark
grayish-brown body plumage with many
small gray and white speckles, fleshy
yellow combs over the eyes, long
pointed tails, and dark green toes. Males
also have blackish chin and throat
feathers, conspicuous phylloplumes
(specialized erectile feathers) at the back
of the head and neck, and white feathers
forming a ruff around the neck and
upper belly. During breeding displays,
males exhibit olive-green apteria (fleshy
bare patches of skin) on their breasts
(Schroeder et al. 1999).
In 2000, the species was separated
into 2 distinct species, the greater sagegrouse (C. urophasianus) and the
Gunnison sage-grouse (C. minimus)
based on genetic, morphological and
behavioral differences (Young et al.
2000). This finding only addresses the
greater sage-grouse.
Although the American
Ornithological Union (AOU) recognizes
two subspecies of the greater sage-
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grouse, the eastern (C. u. urophasianus)
and western (C. u. phaios), based on
research by Aldrich (1946), recent
genetic analyses do not support this
delineation (Benedict et al. 2003; OylerMcCance et al. in press). There are no
known delimiting differences in habitat
use, natural history, or behavior
between the two subspecies. Therefore,
the Service no longer acknowledges the
subspecies designation (68 FR 6500;
February 7, 2003; 69 FR 933; January 7,
2004).
Sage-grouse depend on a variety of
shrub-steppe habitats throughout their
life cycle, and are considered obligate
users of several species of sagebrush
(e.g., Wyoming big sagebrush (Artemisia
tridentata wyomingensis), mountain big
sagebrush (A. t. vaseyana), and basin big
sagebrush (A. t. tridentata) (Patterson
1952; Braun et al. 1976; Connelly et al.
2000a; Connelly et al. 2004)). Sagegrouse also use other sagebrush species
such as low sagebrush (A. arbuscula),
black sagebrush (A. nova), fringed
sagebrush (A. frigida) and silver
sagebrush (A. cana) (Schroeder et al.
1999; Connelly et al. 2004). Thus, sagegrouse distribution is strongly correlated
with the distribution of sagebrush
habitats (Schroeder et al. 2004). While
sage-grouse are dependent on large,
interconnected expanses of sagebrush
(Patterson 1952; Connelly et al. 2004),
information is not available regarding
minimum sagebrush patch sizes
required to support populations of sagegrouse. Sage-grouse exhibit strong site
fidelity (loyalty to a particular area) for
breeding and nesting areas (Connelly et
al. 2004).
During the spring breeding season,
male sage-grouse gather together to
perform courtship displays on display
areas called leks. Areas of bare soil,
short-grass steppe, windswept ridges,
exposed knolls, or other relatively open
sites may serve as leks (Patterson 1952;
Connelly et al. 2004 and references
therein). Leks are often surrounded by
denser shrub-steppe cover, which is
used for escape, thermal and feeding
cover. Leks can be formed
opportunistically at any appropriate site
within or adjacent to nesting habitat
(Connelly et al. 2000a), and therefore
lek habitat availability is not considered
to be a limiting factor for sage-grouse
(Schroeder 1997). Leks range in size
from less than 0.04 hectare (ha) (0.1 acre
(ac)) to over 36 ha (90 ac) (Connelly et
al. 2004) and can host from several to
hundreds of males (Johnsgard 2002).
Males defend individual territories
within leks and perform elaborate
displays with their specialized plumage
and vocalizations to attract females for
mating. A relatively small number of
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dominant males accounts for the
majority of breeding on each lek
(Schroeder et al. 1999).
Sage-grouse typically select nest sites
under sagebrush cover, although other
shrub or bunchgrass species are
sometimes used (Klebenow 1969;
Connelly et al. 2000a; Connelly et al.
2004). The sagebrush understory of
productive nesting areas contains native
grasses and forbs, with horizontal and
vertical structural diversity that
provides an insect prey base,
herbaceous forage for pre-laying and
nesting hens, and cover for the hen
while she is incubating (Gregg 1991;
Schroeder et al. 1999; Connelly et al.
2000a; Connelly et al. 2004). Shrub
canopy and grass cover provide
concealment for sage-grouse nests and
young, and are critical for reproductive
success (Barnett and Crawford 1994;
Gregg et al. 1994; DeLong et al.1995;
Connelly et al. 2004). Vegetation
characteristics of nest sites, as reported
in the scientific literature have been
summarized by Connelly et al. (2000a).
Females have been documented to
travel more than 20 km (12.5 mi) to their
nest site after mating (Connelly et al.
2000a), but distances between a nest site
and the lek on which breeding occurred
is variable (Connelly et al. 2004). While
earlier studies indicated that most hens
nest within 3.2 km (2 mi) of a lek, more
recent research indicates that many
hens actually move much further from
leks to nest based on nesting habitat
quality (Connelly et al. 2004). Research
by Bradbury et al. (1989) and Wakkinen
et al. (1992) demonstrated that nest sites
are selected independent of lek
locations.
Sage-grouse clutch size ranges from 6
to 13 eggs (Schroeder et al. 2000). Nest
success (one or more eggs hatching from
a nest), as reported in the scientific
literature, ranges from 15 to 86 percent
of initiated nests (Schroeder et al. 1999),
and is typically lower than other prairie
grouse species (Connelly et al. 2000a)
and therefore indicative of a lower
intrinsic (potential) population growth
rate than in most game bird species
(Schroeder et al. 1999). Renesting rates
following nest loss range from 5 to 41
percent (Schroeder 1997).
Hens rear their broods in the vicinity
of the nest site for the first 2 to 3 weeks
following hatching (Connelly et al.
2004). Forbs and insects are essential
nutritional components for chicks
(Klebenow and Gray 1968; Johnson and
Boyce 1991; Connelly et al. 2004).
Therefore, early brood-rearing habitat
must provide adequate cover adjacent to
areas rich in forbs and insects to assure
chick survival during this period
(Connelly et al. 2004).
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Sage-grouse move from sagebrush
uplands to more mesic areas during the
late brood-rearing period (3 weeks posthatch) in response to summer
desiccation of herbaceous vegetation
(Connelly et al. 2000a). Summer use
areas can include sagebrush habitats as
well as riparian areas, wet meadows and
alfalfa fields (Schroeder et al. 1999).
These areas provide an abundance of
forbs and insects for both hens and
chicks (Schroeder et al. 1999; Connelly
et al. 2000a). Sage-grouse will use free
water although they do not require it
since they obtain their water needs from
the food they eat. However, natural
water bodies and reservoirs can provide
mesic areas for succulent forb and insect
production, thereby attracting sagegrouse hens with broods (Connelly et al.
2004). Broodless hens and cocks will
also use more mesic areas in close
proximity to sagebrush cover during the
late summer (Connelly et al. 2004).
As vegetation continues to desiccate
through the late summer and fall, sagegrouse shift their diet entirely to
sagebrush (Schroeder et al. 1999). Sagegrouse depend entirely on sagebrush
throughout the winter for both food and
cover. Sagebrush stand selection is
influenced by snow depth (Patterson
1952; Connelly 1982 as cited in
Connelly et al. 2000a), and, in some
areas, topography (Beck 1977; Crawford
et al. 2004).
Many populations of sage-grouse
migrate between seasonal ranges in
response to habitat distribution
(Connelly et al. 2004). Migration can
occur between winter and breeding/
summer areas, between breeding,
summer and winter areas, or not at all.
Migration distances of up to 161
kilometers (km) (100 mi) have been
recorded (Patterson 1952); however,
average individual movements are
generally less than 34 km (21 mi)
(Schroeder et al. 1999). Migration
distances for female sage-grouse
generally are less than for males
(Connelly et al. 2004). Almost no
information is available regarding the
distribution and characteristics of
migration corridors for sage-grouse
(Connelly et al. 2004). Sage-grouse
dispersal (permanent moves to other
areas) is poorly understood (Connelly et
al. 2004) and appears to be sporadic
(Dunn and Braun 1986).
Sage-grouse typically live between 1
and 4 years, but individuals up to 10
years of age have been recorded in the
wild (Schroeder et al. 1999). Juvenile
survival (from hatch to first breeding
season) is affected by food availability,
habitat quality, harvest, and weather.
Documented juvenile survival rates
have ranged between 7 and 60 percent
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in a review of many field studies
(Crawford et al. 2004). The average
annual survival rate for male sagegrouse (all ages combined) documented
in various studies ranged from 38 to 60
percent (Schroeder et al. 1999), and for
females 55 to 75 percent (Schroeder
1997; Schroeder et al. 1999). Survival
rates are high compared with other
prairie grouse species (Schroeder et al.
1999). Higher female survival rates
account for a female-biased sex ratio in
adult birds (Schroeder 1997; Johnsgard
2002). Although seasonal patterns of
mortality have not been thoroughly
examined, over-winter mortality is low
(Connelly et al. 2004).
Range and Distribution
Prior to settlement of the western
North America by European immigrants
in the 19th century, greater sage-grouse
lived in 13 States and 3 Canadian
provinces—Washington, Oregon,
California, Nevada, Idaho, Montana,
Wyoming, Colorado, Utah, South
Dakota, North Dakota, Nebraska,
Arizona, British Columbia, Alberta, and
Saskatchewan (Schroeder et al. 1999;
Young et al. 2000; Schroeder et al.
2004). Sagebrush habitats that
potentially supported sage-grouse
occurred over approximately 1,200,483
km2 (463,509 mi2) before 1800
(Schroeder et al. 2004). Currently, sagegrouse occur in 11 States and 2
Canadian provinces, ranging from
extreme southeastern Alberta and
southwestern Saskatchewan, south to
western Colorado, and west to eastern
California, Oregon, and Washington.
Sage-grouse have been extirpated from
Nebraska, British Columbia, and
possibly Arizona (Schroeder et al. 1999;
Young et al. 2000; Schroeder et al.
2004). Current distribution of the greater
sage-grouse is estimated at 668,412 km2
(258,075 mi2) or 56 percent of the
potential pre-settlement distribution
(Schroeder et al. 2004; Connelly et al.
2004). The vast majority of the current
distribution of the greater sage-grouse is
within the United States.
Estimates of current total sage-grouse
abundance vary, but are all much lower
than the historical estimates of a million
or more birds. Braun (1998) estimated
that the 1998 rangewide spring
population numbered about 142,000
sage-grouse, derived from numbers of
males counted on leks. The Service
estimated the rangewide abundance of
sage-grouse in 2000 was at least 100,000
(taken from Braun (1998)) and up to
500,000 birds (based on harvest data
from Idaho, Montana, Oregon and
Wyoming, with the assumption that 10
percent of the population is typically
harvested) (65 FR 51578). Survey
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intensity has increased markedly in
recent years and, in 2003, more than
50,000 males were counted on leks
(Connelly et al. 2004). Therefore,
Connelly et al. (2004) concluded that
rangewide population numbers in 2003
were likely much greater than the
142,000 estimated in 1998 but was
unable to generate a rangewide
population estimate. Sampling methods
used across the range of the sage-grouse
differ, resulting in too much variation to
reliably estimate sage-grouse numbers
(Connelly et al. 2004). Since neither presettlement nor current numbers of sagegrouse are known with complete
precision, the actual rate and extent of
decline cannot be exactly estimated.
Periods of historical decline in sagegrouse abundance occurred from the
late 1800s to the early-1900s (Hornaday
1916; Crawford 1982; Drut 1994;
Washington Department of Fish and
Wildlife 1995; Braun 1998; Schroeder et
al. 1999). Other declines in sage-grouse
populations apparently occurred in the
1920s and 1930s, and then again in the
1960s and 1970s (Connelly and Braun
1997; Braun 1998). State wildlife
agencies were sufficiently concerned
with the decline in the 1920s and 1930s
that many closed their hunting seasons
and others significantly reduced bag
limits and season lengths (Braun 1998)
as a precautionary measure.
Following review of published
literature and anecdotal reports,
Connelly et al. (2004) concluded that
the abundance and distribution of sagegrouse have declined from presettlement numbers to present
abundance. Most of the historic
population changes were the result of
local extirpations, which has been
inferred from a 44 percent reduction in
sage-grouse distribution described by
Schroeder et al. 2004 (Connelly et al.
2004). In an analysis of lek counts,
Connelly et al. (2004) found substantial
declines from 1965 through 2003.
Average declines were 2 percent of the
population per year from 1965 to 2003.
The decline was more dramatic from
1965 through 1985, with an average
annual change of 3.5 percent. Sagegrouse population numbers in the late
1960s and early 1970s were likely two
to three times greater than current
numbers (Connelly et al. 2004).
However, the rate of decline rangewide
slowed from 1986 to 2003 to 0.37
percent annually, and some populations
increased (Connelly et al. 2004).
According to Connelly et al. (2004), of
41 populations delineated rangewide on
geographical, not political boundaries, 5
have been extirpated and 14 are at high
risk of extirpation due to small numbers
(only one active lek). Twelve additional
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populations also have small numbers (7
to 18 known active leks), and 9 of those
are declining at a statistically significant
rate. However, the remaining 10
populations contained the majority (92
percent) of the known active leks and
were distributed across the current
range. Five of these populations were so
large and expansive that they were
divided into 24 subpopulations to
facilitate the analysis for a rangewide
assessment (Connelly et al. 2004).
Habitat
Sagebrush is the most widespread
vegetation in the intermountain
lowlands in the western United States
(West and Young 2000). Scientists
recognize many species and subspecies
of sagebrush (Connelly et al. 2004), each
with unique habitat requirements and
responses to perturbations (West and
Young 2000). Sagebrush species and
subspecies occurrence in an area is
dictated by local soil type, soil moisture,
and climatic conditions (West 1983;
West and Young 2000), and the degree
of dominance by sagebrush varies with
local site conditions and disturbance
history. Plant associations, typically
defined by perennial grasses, further
define distinctive sagebrush
communities (Miller and Eddleman
2000; Connelly et al. 2004), and are
influenced by topography, elevation,
precipitation and soil type.
All species of sagebrush produce large
ephemeral leaves in the spring, which
persist until soil moisture stress
develops in the summer. Most species
also produce smaller, over-wintering
leaves in the late spring that last
through summer and winter. Sagebrush
have fibrous, tap root systems, which
allow the plants to draw surface soil
moisture, but also access water deep
within the soil profile when surface
water is limiting (West and Young
2000). Most sagebrush flower in the fall.
However, during years of drought or
other moisture stress, flowering may not
occur. Although seed viability and
germination are high, seed dispersal is
limited. Additionally, for unknown
reasons, sagebrush seeds do not persist
in seed banks beyond the year of their
production (West and Young 2000).
Sagebrush are long-lived, with plants
of some species surviving up to 150
years (West 1983). They produce
allelopathic chemicals that reduce seed
germination, seedling growth and root
respiration of competing plant species
and inhibit the activity of soil microbes
and nitrogen fixation. Sagebrush has
resistance to environmental extremes,
with the exception of fire and
occasionally defoliating insects (e.g., the
webworm (Aroga spp.; West 1983)).
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Most species of sagebrush are killed by
fire (Miller and Eddleman 2000; West
1983; West and Young 2000). Natural
sagebrush re-colonization in burned
areas depends on the presence of
adjacent live plants for a seed source or
on the seed bank, if present (Miller and
Eddleman 2000).
Sagebrush is typically divided into
two groups, big sagebrush and low
sagebrush, based on their affinities for
different soil types (West and Young
2000). Big sagebrush species and
subspecies are limited to coarsetextured and/or well-drained sediments,
whereas low sagebrush subspecies
typically occur where erosion has
exposed clay or calcified soil horizons
(West 1983; West and Young 2000).
Reflecting these soil differences, big
sagebrush will die if surfaces are
saturated long enough to create
anaerobic conditions for 2 to 3 days
(West and Young 2000). Some of the
low sagebrush are more tolerant of
occasionally supersaturated soils, and
many low sage sites are partially
flooded during spring snowmelt. None
of the sagebrush taxa tolerate soils with
high salinity (West and Young 2000).
Both groups of sagebrush are used by
sage-grouse.
The response of sagebrush and
sagebrush ecosystems to natural and
human-influenced disturbances varies
based on the species of sagebrush and
its understory component, as well as
abiotic factors such as soil types and
precipitation. For example, mountain
big sagebrush can generally recover
more quickly and robustly following
disturbance than Wyoming big
sagebrush (Miller and Eddleman 2000),
likely due to its occurrence on moist,
well drained soils, versus the very dry
soils typical of Wyoming big sagebrush
communities. Soil associations have
also resulted in disproportionate levels
of habitat conversion across different
sagebrush communities. For example,
basin big sage is found at lower
elevations, in soils that retain moisture
two to four weeks longer than in well
drained, but dry and higher elevation
soils typical of Wyoming big sagebrush
locations. Therefore, sagebrush
communities dominated by basin big
sagebrush have been converted to
agriculture more extensively than have
communities on poorer soil sites
(Winward 2004).
The effects of disturbance to
sagebrush are not constant across the
range of the sage-grouse. Connelly et al.
(2004) presented sage-grouse population
data by the described delineations of
sagebrush ecosystems and communities
(Miller and Eddleman 2000, from
Kuchler’s 1985 map; and West 1983).
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Unfortunately, information on impacts
to the habitats has not been collected in
a compatible manner, making analyses
of these impacts specifically within
each distinct ecosystem and community
impossible. Therefore, while we
acknowledge habitat differences across
the greater sage-grouse range, we were
unable to conduct our review at that
level.
Discussion of Listing Factors
Section 4 of the Act (16 U.S.C. 1531)
and implementing regulations at 50 CFR
part 424 set forth procedures for adding
species to the Federal endangered and
threatened species list. A species may
be determined to be an endangered or
threatened species due to one or more
of the five factors described in section
4(a)(1) of the Act. These factors and
their application to the greater sagegrouse are as follows:
A. The Present or Threatened
Destruction, Modification, or
Curtailment of Its Habitat or Range
Habitat Conversion
Sagebrush is estimated to have
covered roughly 120 million ha (296
million ac; Schroeder et al. 2004) in
western North America, but millions of
those hectares have been cultivated for
the production of potatoes, wheat, and
other crops (Schroeder et al. 1999,
2000). Western rangelands were
converted to agricultural lands on a
large scale beginning with the series of
Homestead Acts in the 1800s (Braun
1998, Hays et al. 1998), especially
where suitable deep soil terrain and
water were available (Rogers 1964).
Connelly et al. (2004) estimated that
24.9 million ha (61.5 million ac) within
their assessment area for sage-grouse is
now comprised of agricultural lands
(note, not all of the species’ total range
is sagebrush habitat, and the assessment
area is larger than the sage-grouse
current distribution). Influences
resulting from agricultural activities
adjoining sagebrush habitats extend into
those habitats, and include increased
predation and reduced nest success due
to predators associated with agriculture
(Connelly et al. 2004). Adding a 6.9 km
(4.3 mi) buffer around agricultural areas
(for the potential foraging distance of
domestic cats and red foxes (Vulpes
vulpes)), Connelly et al. (2004)
estimated 115.2 million ha (284.7
million ac) (56 percent) within their
assessment area for the greater sagegrouse is influenced by agriculture.
In some States, the loss of sagebrush
shrub-steppe habitats through
conversion to agricultural crops has
been dramatic. This impact has been
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especially apparent in the Columbia
Basin of the Northwest and the Snake
River Plain of Idaho (Schroeder et al.
2004). Hironaka et al. (1983) estimated
that 99 percent of basin big sagebrush
(A. t. tridentata) habitat in the Snake
River Plain has been converted to
cropland. Prior to European immigrant
settlement in the 19th century,
Washington had an estimated 42 million
ha (103.8 million ac) of shrub-steppe
(Connelly et al. 2004). Dobler (1994)
estimated that approximately 60 percent
of the original shrub-steppe habitat in
Washington has been converted to
primarily agricultural uses. In eastern
Washington, land conversion to dryland
farming occurred mostly between 1900
and the 1940s (Hays et al. 1998) and
then in the 1950s and 1960s large-scale
irrigation projects (made possible
through the construction of dams)
reduced sage-grouse habitat even further
(Hofmann 1991 in Hays et al. 1998).
Deep soils supporting shrub-steppe
communities in Washington continue to
be converted to agricultural uses
(Vander Haegen et al. 2000), resulting in
habitat loss. In north central Oregon,
approximately 2.6 million ha (6.4
million ac) of habitat were converted for
agricultural purposes, essentially
eliminating sage-grouse from this area
(Willis et al. 1993). More broadly, across
the Interior Columbia Basin of southern
Idaho, northern Utah, northern Nevada,
eastern Oregon and Washington,
approximately 6 million ha (14.8
million ac) of shrub-steppe habitat has
been converted to agricultural crops
(Altman and Holmes 2000).
Development of irrigation projects to
support agricultural production, in
some cases conjointly with
hydroelectric dam construction, has
resulted in additional sage-grouse
habitat loss (Braun 1998). The reservoirs
formed by these projects impacted
native shrub-steppe habitat adjacent to
the rivers in addition to supporting the
irrigation and direct conversion of
shrub-steppe lands to agriculture. The
projects precipitated conversion of large
expanses of upland shrub-steppe habitat
in the Columbia Basin for irrigated
agriculture (August 24, 2000; 65 FR
51578). The creation of these reservoirs
also inundated hundreds of kilometers
of riparian habitats used by sage-grouse
broods (Braun 1998). However, other
small and isolated reclamation projects
(4,000 to 8,000 ha [10,000 to 20,000 ac])
were responsible for three-fold localized
increases in sage-grouse populations
(Patterson 1952) by providing water in
a semi-arid environment which
provided additional insect and forb food
resources (e.g., Eden Reclamation
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Project in Wyoming). Shrub-steppe
habitat continues to be converted for
both dryland and irrigated crop
production, albeit at much-reduced
levels (65 FR 51578; Braun 1998).
Although conversion of shrub-steppe
habitat to agricultural crops impacts
sage-grouse through the loss of
sagebrush on a broad scale, some
studies report the use of agricultural
crops (e.g., alfalfa) by sage-grouse. When
alfalfa fields and other croplands are
adjacent to extant sagebrush habitat,
sage-grouse have been observed feeding
in these fields, especially during broodrearing (Patterson 1952, Rogers 1964,
Wallestad 1971, Connelly et al. 1988,
Fischer et al. 1997). Connelly et al.
(1988) reported seasonal movements of
sage-grouse to agricultural crops as
sagebrush habitats desiccated during the
summer.
Sagebrush removal to increase
herbaceous forage and grasses for
domestic and wild ungulates is a
common practice in sagebrush
ecosystems (Connelly et al. 2004). By
the 1970s, over 2 million ha (5 million
ac) of sagebrush had been mechanically
treated, sprayed with herbicide, or
burned (Crawford et al. 2004). Braun
(1998) concluded that since European
settlement of western North America, all
sagebrush habitats used by greater sagegrouse have been treated in some way
to reduce shrub cover. The use of
chemicals to control sagebrush was
initiated in the 1940s and intensified in
the 1960s and early 1970s (Braun 1987).
The extent to which mechanical and
chemical removal or control of
sagebrush currently occurs is not
known, particularly with regard to
private lands. However, the BLM has
stated that with rare exceptions, they no
longer are involved in actions that
convert sagebrush to other habitat types,
and that mechanical or chemical
treatments in sagebrush habitat on BLM
lands currently focus on improving the
diversity of the native plant community,
reducing conifer encroachment, or
reducing the risk of a large wildfire
(BLM 2004a).
Greater sage-grouse response to
herbicide treatments depends on the
extent to which forbs and sagebrush are
killed. Chemical control of sagebrush
has resulted in declines of sage-grouse
breeding populations through the loss of
live sagebrush cover (Connelly et al.
2000a). Herbicide treatment also can
result in sage-grouse emigration from
affected areas (Connelly et al. 2000a),
and has been documented to have a
negative effect on nesting, brood
carrying capacity (Klebenow 1970), and
winter shrub cover essential for food
and thermal cover (Pyrah 1972 and
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Higby 1969 as cited in Connelly et al.
2000a). Conversely, small treatments
interspersed with non-treated sagebrush
habitats did not affect sage-grouse use,
presumably due to minimal effects on
food or cover (Braun 1998). Also
application of herbicides in early spring
to reduce sagebrush cover may enhance
some brood-rearing habitats by
increasing the coverage of herbaceous
plant foods (Autenrieth 1981).
Mechanical treatments are designed to
either remove the aboveground portion
of the sagebrush plant (mowing, roller
chopping, and rotobeating), or to uproot
the plant from the soil (grubbing,
bulldozing, anchor chaining, cabling,
railing, raking, and plowing; Connelly et
al. 2004). These treatments were begun
in the 1930s and continued at relatively
low levels to the late 1990s (Braun
1998). Mechanical treatments, if
carefully designed and executed, can be
beneficial to sage-grouse by improving
herbaceous cover, forb production, and
resprouting of sagebrush (Braun 1998).
However, adverse effects also have been
documented (Connelly et al. 2000a). For
example, in Montana, the number of
breeding males declined by 73 percent
after 16 percent of the 202 km2 (78 mi2)
study area was plowed (Swenson et al.
1987). Mechanical treatments in blocks
greater than 100 ha (247 ac), or of any
size seeded with exotic grasses, degrade
sage-grouse habitat by altering the
structure and composition of the
vegetative community (Braun 1998).
While many square miles of sagebrush
habitat has been lost during the past 150
years to conversion of sagebrush habitat
to agriculture, this conversion occurs at
such relatively low levels today, that we
do not consider it a threat to the greater
sage-grouse on a rangewide basis.
Habitat Fragmentation
This section considers the various
natural and anthropogenic forces that
influence sage-grouse habitat and can
result in habitat fragmentation. Habitat
fragmentation is the separation or
splitting apart of previously contiguous,
functional habitat components of a
species. Fragmentation can result from
direct habitat losses that leave the
remaining habitat in non-contiguous
patches, or from alteration of habitat
areas that render the altered patches
unusable to a species (i.e., functional
habitat loss). Functional habitat losses
include disturbances that change a
habitat’s successional state or remove
one or more habitat functions, physical
barriers that preclude use of otherwise
suitable areas, and activities that
prevent animals from using suitable
habitats patches due to behavioral
avoidance.
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Sagebrush communities exhibit a high
degree of variation in their resistance
and resilience to change, beyond natural
variation. Resistance (the ability to
withstand disturbing forces without
changing) and resilience (the ability to
recover once altered) generally increase
with increasing moisture and decreasing
temperatures, and can also be linked to
soil characteristics (Connelly et al.
2004). However, most extant sagebrush
habitat has been altered since European
immigrant settlement of the West (Baker
et al. 1976; Braun 1998; Knick et al.
2003; Connelly et al. 2004), and
sagebrush habitat continues to be
fragmented and lost (Knick et al. 2003)
through the factors described below.
The cumulative effects of habitat
fragmentation have not been quantified
over the range of sagebrush and most
fragmentation cannot be attributed to
specific land uses (Knick et al. 2003).
Fragmentation of sagebrush habitats
has been cited as a primary cause of the
decline of sage-grouse populations since
the species requires large expanses of
contiguous sagebrush (Patterson 1952;
Connelly and Braun 1997; Braun 1998;
Johnson and Braun 1999; Connelly et al.
2000a; Miller and Eddleman 2000;
Schroeder and Baydack 2001; Johnsgard
2002; Aldridge and Brigham 2003; Beck
et al. 2003; Pedersen et al. 2003;
Connelly et al. 2004; Schroeder et al.
2004). However, there is a lack of data
to assess how fragmentation influences
specific greater sage-grouse life history
parameters such as productivity,
density, and home range. While sagegrouse are dependent on interconnected
expanses of sagebrush (Patterson 1952;
Connelly et al. 2004), data are not
available regarding minimum sagebrush
patch sizes to support populations of
sage-grouse. Estimating the impact of
habitat fragmentation on sage-grouse is
complicated by time lags in response to
habitat changes, particularly since these
long-lived birds will continue to return
to altered breeding areas (leks, nesting
areas, and early brood-rearing areas) due
to strong site fidelity despite nesting or
productivity failures (Wiens and
Rotenberry 1985).
Powerlines
Power grids were first constructed in
the United States in the late 1800s. The
public demand for electricity has grown
as human population and industrial
activities have expanded (Manville
2002), resulting in more than 804,500
km (500,000 mi) of transmission lines
(lines carrying ≥ 115,000 volts/115kV)
by 2002 within the United States
(Manville 2002). A similar estimate is
not available for distribution lines (lines
carrying ≤ 69,000 volts/69kV), and we
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are not aware of data for Canada. Within
their analysis area (i.e., the preEuropean settlement distribution of
greater sage-grouse, including Canada,
plus a 50-km (31.3-mi) buffer (buffer is
to allow for external factors that may
have contributed to current trends in
populations or habitats)), Connelly et al.
(2004) state there is a minimum of
15,296 km2 (5,904 mi2) of land (less than
1 percent of their assessment area) in
transmission powerline corridors, but
could provide no estimate of the density
of distribution lines in their assessment
area.
Powerlines can directly affect greater
sage-grouse by posing a collision and
electrocution hazard (Braun 1998;
Connelly et al. 2000a), and can have
indirect effects by increasing predation
(Connelly et al. 2004), fragmenting
habitat (Braun 1998), and facilitating the
invasion of exotic annual plants (Knick
et al. 2003; Connelly et al. 2004). In
1939, Borell reported the deaths of 3
adult sage-grouse as a result of colliding
with a telegraph line in Utah (Borell
1939). Both Braun (1998) and Connelly
et al. (2000a) report that sage-grouse
collisions with powerlines occur,
although no specific instances were
presented. Other than an unpublished
observation reported by Aldridge and
Brigham (2003), we were unable to find
documentations of other collisions and/
or electrocutions of sage-grouse
resulting from powerlines.
In areas where the vegetation is low
and the terrain relatively flat, power
poles provide an attractive hunting and
roosting perch, as well as nesting
stratum for many species of raptors
(Steenhof et al. 1993; Connelly et al.
2000a; Manville 2002; Vander Haegen et
al. 2002). Power poles increase a
raptor’s range of vision, allow for greater
speed during attacks on prey, and serve
as territorial markers (Steenhof et al.
1993; Manville 2002). Raptors may
actively seek out power poles where
natural perches are limited. For
example, within one year of
construction of a 596-km (372.5-mi)
transmission line in southern Idaho and
Oregon, raptors and common ravens
(Corvus corax) began nesting on the
supporting poles (Steenhof et al. 1993).
Within 10 years of construction, 133
pairs of raptors and ravens were nesting
along this stretch (Steenhof et al. 1993).
The increased abundance of raptors and
corvids within occupied sage-grouse
habitats can result in increased
predation. Ellis (1985) reported that
golden eagle predation on sage-grouse
on leks increased from 26 to 73 percent
of the total predation after completion of
a transmission line within 200 m (220
yd) of an active sage-grouse lek in
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northeastern Utah. The lek was
eventually abandoned, and Ellis (1985)
concluded that the presence of the
powerline resulted in changes in sagegrouse dispersal patterns and
fragmentation of the habitat. Leks
within 0.4 km (0.25 mi) of new
powerlines constructed for coalbed
methane development in the Powder
River Basin of Wyoming had
significantly lower growth rates, as
measured by recruitment of new males
onto the lek, compared to leks further
from these lines, which was presumed
to be the result of increased raptor
predation (Braun et al. 2002). Within
their analysis area, Connelly et al.
(2004) estimated that the area
potentially influenced by additional
perches for corvids and raptors
provided by powerlines, assuming a 5 to
6.9-km (3.1 to 4.3-mi) radius buffer
around the perches based on the average
foraging distance of these predators, was
672,644 to 837,390 km2 (259,641 to
323,317 mi2), or 32 to 40 percent of their
assessment area. The actual impact on
the area would depend on corvid and
raptor densities within the area. The
presence of a powerline may fragment
sage-grouse habitats even if raptors are
not present. Braun (1998; unpublished
data) found that use of otherwise
suitable habitat by sage-grouse near
powerlines increased as distance from
the powerline increased for up to 600 m
(660 yd) and based on that unpublished
data reported that the presence of
powerlines may limit sage-grouse use
within 1 km (0.6 mi) in otherwise
suitable habitat.
Linear corridors through sagebrush
habitats can facilitate the spread of
invasive species, such as cheatgrass
(Bromus tectorum) (Gelbard and Belnap
2003; Knick et al. 2003; Connelly et al.
2004). However, we were unable to find
any information regarding the amount of
invasive species incursion as a result of
powerline construction.
Powerlines are common to nearly
every type of anthropogenic habitat use,
except perhaps some forms of
agricultural development (e.g., livestock
grazing) and fire. Although we were
unable to find an estimate of all future
proposed powerlines within currently
occupied sage-grouse habitats, we
anticipate that powerlines will increase,
particularly given the increasing
development of energy resources and
urban areas. For example, up to 8,579
km (5,311 mi) of new powerlines are
predicted for the development of the
Powder River Basin coal-bed methane
field in northeastern Wyoming (BLM
2003a) in addition to the approximately
9,656 km (6,000 mi) already constructed
in that area. Although raptors associated
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with powerlines may negatively impact
individual greater sage-grouse and
habitats, we could find no information
regarding the effect of this impact on a
rangewide basis.
Communication Towers
Within sage-grouse habitats, 9,510
new communication towers have been
constructed within recent years
(Connelly et al. 2004). While millions of
birds are killed annually in the United
States through collisions with
communication towers and their
associated structures (guy wires, lights,
etc.; Manville 2002), most documented
mortalities are of migratory songbirds.
We were unable to determine if any
sage-grouse mortalities occur as a result
of collision with communication towers
or their supporting structures, as most
towers are not monitored and those that
are lie outside the range of the species
(Shire et al. 2000; Kerlinger 2000).
However, communication towers also
provide perches for corvids and raptors
(Steenhof et al. 1993; Connelly et al.
2004). We could find no information
regarding the potential impacts of
communication towers to the greater
sage-grouse on a rangewide basis.
Fences
Fences are used to delineate property
boundaries and for livestock
management (Braun 1998; Connelly et
al. 2000a). The effects of fencing on
sage-grouse include direct mortality
through collisions, creation of predator
(raptor) perch sites, the potential
creation of a predator corridor along
fences (particularly if a road is
maintained next to the fence), incursion
of exotic species along the fencing
corridor, and habitat fragmentation (Call
and Maser 1985; Braun 1998; Connelly
et al. 2000a; Beck et al. 2003; Knick et
al. 2003; Connelly et al. 2004).
Sage-grouse frequently fly low and
fast across sagebrush flats and new
fences can create a collision hazard (Call
and Maser 1985). Thirty-six carcasses of
sage-grouse were found near Randolph,
Utah, along a 3.2 km (2 mi) fence within
three months of its construction (Call
and Maser 1985). Twenty-one incidents
of mortality through fence collisions
near Pinedale, Wyoming, were reported
in 2003 to the BLM (Connelly et al.
2004). Fence collisions continue to be
identified as a source of mortality
(Braun 1998; Connelly et al. 2000a;
Oyler-McCance et al. 2001; Connelly et
al. 2004), although effects on
populations are not understood. Fence
posts also create perching places for
raptors and corvids, which may increase
their ability to prey on sage-grouse
(Braun 1998; Connelly et al. 2000b;
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Oyler-McCance et al. 2001; Connelly et
al. 2004). We anticipate that the effect
on sage-grouse populations through the
creation of new raptor perches and
predator corridors into sagebrush
habitats are similar to that of powerlines
discussed previously (Braun 1998;
Connelly et al. 2004). Fences and their
associated roads also facilitate the
spread of invasive plant species that
replace sagebrush plants upon which
sage-grouse depend (Braun 1998;
Connelly et al. 2000a; Gelbard and
Belnap 2003; Connelly et al. 2004).
Greater sage-grouse avoidance of habitat
adjacent to fences, presumably to
minimize the risk of predation,
effectively results in habitat
fragmentation even if the actual habitat
is not removed (Braun 1998). More than
1,000 km (625 mi) of fences were
constructed annually in sagebrush
habitats from 1996 through 2002, mostly
in Montana, Nevada, Oregon and
Wyoming (Connelly et al. 2004). Over
51,000 km (31,690 mi) of fences were
constructed on BLM lands supporting
sage-grouse populations between 1962
and 1997 (Connelly et al. 2000a).
However, some of the new 1–3 wire
fencing being erected across the range
may pose less of a collision risk to sage
grouse than woven fences.
Roads and Railroads
Impacts from roads may include
direct habitat loss, direct mortality,
create barriers to migration corridors or
seasonal habitats, facilitation of
predators and spread of invasive
vegetative species, and other indirect
influences such as noise (Forman and
Alexander 1998). Interstates and major
paved roads cover approximately 14,272
km2 (22,835 mi2), less then 1 percent of
their assessment area (Connelly et al.
2004). Secondary paved road densities
within this area range to greater than 2
km/km2 (3.24 mi/mi2). Sage-grouse
mortality resulting from collisions with
vehicles does occur (Patterson 1952),
but mortalities are typically not
monitored or recorded. Therefore, we
are unable to determine the importance
of this factor on sage-grouse
populations. Data regarding how roads
affect seasonal habitat availability for
individual sage-grouse populations by
creating barriers and the ability of sagegrouse to reach these areas were not
available. Road development within
Gunnison sage-grouse habitats
precluded movement of local
populations between the resultant
patches, presumably to minimize their
exposure to predation (Oyler-McCance
et al. 2001).
Roads can provide corridors for
predators to move into previously
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unoccupied areas. For some mammalian
species, dispersal along roads has
greatly increased their distribution
(Forman and Alexander 1998; Forman
2000). Corvids also use linear features
such as primary and secondary roads as
travel routes, expanding their
movements into previously unused
regions (Connelly et al. 2000b; Aldridge
and Brigham 2003; Connelly et al.
2004). In an analysis of anthropogenic
impacts, Connelly et al. (2004) reported
that at least 58 percent of their analysis
area has a high or medium presence of
corvids, known sage-grouse nest and
chick predators (Schroeder and Baydack
2001). We have no information on the
extent to which corvids prey on sagegrouse chicks and eggs. Additionally,
highway rest areas provide a source of
food and perches for corvids and
raptors, and facilitate their movements
into surrounding areas (Connelly et al.
2004). It has not been documented that
sage-grouse populations are affected by
predators using roads as corridors into
sagebrush habitats.
The presence of roads also increases
human access and their resulting
disturbance effects in remote areas
(Forman and Alexander 1998; Forman
2000; Connelly et al. 2004). Increases in
legal and illegal hunting activities
resulting from the use of roads built into
sagebrush habitats have been
documented (Patterson 1952; Connelly
et al. 2004). However, the actual current
effect of these increased activities on
sage-grouse populations has not been
determined. Roads may also facilitate
access for habitat treatments (Connelly
et al. 2004), resulting in subsequent
direct habitat losses. New roads are
being constructed to support
development activities within the
greater sage-grouse extant range. For
example, in the Powder River Basin of
Wyoming, up to 28,572 km (17,754 mi)
of roads to support coalbed methane
development are proposed (BLM 2003a).
The expansion of road networks has
been documented to contribute to exotic
plant invasions via introduced roadfill,
vehicle transport, and road maintenance
activities (Forman and Alexander 1998;
Forman 2000; Gelbard and Belnap 2003;
Knick et al. 2003; Connelly et al. 2004).
Invasive species are not limited to
roadsides (or verges), but have also
encroached into the surrounding
habitats (Forman and Alexander 1998;
Forman 2000; Gelbard and Belnap
2003). In their study of roads on the
Colorado Plateau of southern Utah,
Gelbard and Belnap (2003) found that
improving unpaved four-wheel drive
roads to paved roads resulted in
increased cover of exotic plant species
within the interior of adjacent vegetative
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communities. This effect was associated
with road construction and maintenance
activities and vehicle traffic, and not
with differences in site characteristics.
The incursion of exotic plants into
native sagebrush systems can negatively
affect greater sage-grouse through
habitat losses and conversions (see
further discussion below).
Additional indirect effects of roads
may result from birds’ behavioral
avoidance of road areas because of
noise, visual disturbance, pollutants,
and predators moving along a road. The
absence of screening vegetation in arid
and semiarid regions further exacerbates
the problem (Suter 1978). Male sagegrouse depend on acoustical signals to
attract females to leks (Gibson and
Bradbury 1985; Gratson 1993). If noise
interferes with mating displays, and
thereby female attendance, younger
males will not be drawn to the lek and
eventually leks will become inactive
(Amstrup and Phillips 1977; Braun
1986). Dust from roads and exposed
roadsides can damage vegetation
through interference with
photosynthetic activities; the actual
amount of potential damage depends on
winds, wind direction, the type of
surrounding vegetation and topography
(Forman and Alexander 1998).
Chemicals used for road maintenance,
particularly in areas with snowy or icy
precipitation, can affect the composition
of roadside vegetation (Forman and
Alexander 1998). We were unable to
find any data relating these potential
effects to impacts on sage-grouse
population parameters.
In a study on the Pinedale Anticline
in Wyoming, sage-grouse hens that bred
on leks within 3 km (1.9 mi) of roads
associated with oil and gas development
traveled twice as far to nest as did hens
bred on leks greater than 3 km (1.9 mi)
from roads. Nest initiation rates for hens
bred on leks ‘‘close’’ to roads were also
lower (50 vs 65 percent) affecting
population recruitment (33 vs. 44
percent) (Lyon 2000; Lyon and
Anderson 2003). Lyon and Anderson
(2003) suggested that roads may be the
primary impact of oil and gas
development to sage-grouse, due to their
persistence and continued use even
after drilling and production have
ceased. Braun et al. (2002) suggested
that daily vehicular traffic along road
networks for oil wells can impact sagegrouse breeding activities based on lek
abandonment patterns. In a study of 804
leks within 100 km (62.5 mi) of
Interstate 80 in southern Wyoming and
northeastern Utah, Connelly et al.
(2004) found that there were no leks
within 2 km (1.25 mi) of the interstate
and only 9 leks were found between 2
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and 4 km (1.25 and 2.5 mi) along this
same highway. The number of active
leks increased with increasing distance
from the interstate. Lek persistence and
activity relative to distance from the
interstate were also measured. The
distance of a lek from the interstate was
a significant predictor of lek activity,
with leks further from the interstate
more likely to be active. An analysis of
long-term changes in populations
between 1970 and 2003 showed that
leks closest to the interstate declined at
a greater rate than those further away
(Connelly et al. 2004). What is not clear
from these studies is what specific
factor relative to roads (e.g., noise,
changes in vegetation, etc.) sage-grouse
are responding to, and Connelly et al.
(2004) caution that they have not
included other potential sources of
indirect disturbance (e.g., powerlines) in
their analyses.
Railroads presumably have the same
potential impacts to sage-grouse as do
roads since they create linear corridors
within sagebrush habitats. Railways
were primarily responsible for the
initial spread of cheatgrass in the
intermountain region (Connelly et al.
2004). Cheatgrass, an exotic species that
is unsuitable as sage-grouse habitat,
readily invaded the disturbed soils
adjacent to railroads, being distributed
by trains and the cattle they transported.
Fires created by trains facilitated the
spread of cheatgrass into adjacent areas.
Railroads cover 137 km2 (53 mi2) of the
sage-grouse in Connelly et al.’s (2004)
assessment area, but are estimated to
influence an area of 183,915 km2
(71,000 mi2), assuming a 3 km (1.9 mi)
zone of influence (9 percent of their
assessment area). Avian collisions with
trains occur, although no estimates of
mortality rates are documented in the
literature (Erickson et al. 2001).
The effects of infrastructure,
particularly as related to energy
development and urbanization, were
identified by some members of the
expert panel as an important factor
contributing to the extinction risk for
greater sage-grouse, particularly in the
eastern part of the species range
(Montana, Wyoming and Colorado).
Across the entire range of the greater
sage-grouse, infrastructure ranked
second as an extinction risk factor by
the expert panel.
Grazing
Bison, antelope and other ungulates
grazed lands occupied by sage-grouse
prior to European immigrant settlement
of the western United States in the mid
to late 1800s. With settlement, from
1870 to the early 1900s, the numbers of
cattle, sheep, and horses rapidly
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increased, peaking at the turn of the
century (Oliphant 1968, Young et al.
1976) with an estimated 26 million
cattle and 20 million sheep in the West
(Wilkenson 1992). Livestock grazing is
the most widespread type of land use
across the sagebrush biome (Connelly et
al. 2004); almost all sagebrush areas are
managed for livestock grazing (Knick et
al. 2003). Cattle and sheep animal unit
months (AUMs; the amount of forage
required to feed one cow with calf, one
horse, five sheep, or five goats for one
month) on all Federal land have
declined since the early 1900s (Laycock
et al. 1996). By the 1940s AUMs on all
Federal lands were estimated to be 14.6
million, increasing to 16.5 million in the
1950s, and gradually declining to 10.2
million by the 1990s (Miller and
Eddleman 2000). As of 2003, active
AUMs for BLM lands in States where
sage-grouse occur totaled about 10.1
million (BLM 2003b). Most of the 78.3
million acres of BLM-administered land
within the current range of the greater
sage-grouse are open to livestock grazing
(BLM 2004a). Knick et al. (2003) state
that excessive grazing by domestic
livestock during the late 1800s and early
1900s, along with severe drought,
significantly impacted sagebrush
ecosystems. Long-term effects from this
overgrazing, including changes in plant
communities and soils persist today.
Few studies have directly addressed
the effect of livestock grazing on sagegrouse (Beck and Mitchell 2000,
Wamboldt et al. 2002, Crawford et al.
2004), and there is little direct
experimental evidence linking grazing
practices to sage-grouse population
levels (Braun 1987, Connelly and Braun
1997). Native herbivores, such as
pronghorn antelope (Antilocarpo
americana), were present in the
sagebrush steppe region prior to
European settlement of western States
(Miller et al. 1994), and sage-grouse coevolved with these animals. However,
many areas of sagebrush-steppe did not
support herds of large ungulates, as
large native herbivores disappeared
12,000 years before present (Knick et al.
2003). Therefore, native vegetation
communities within the sagebrush
ecosystem developed in the absence of
significant grazing presence (Knick et al.
2003).
It has been demonstrated that the
reduction of grass heights due to
livestock grazing of sage-grouse nesting
and brood-rearing areas negatively
affects nesting success by reducing
cover necessary for predator avoidance
(Gregg et al. 1994; Delong et al. 1995;
Connelly et al. 2000a). In addition,
livestock consumption of forbs may
reduce food availability for sage-grouse.
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This is particularly important for prelaying hens, as forbs provide essential
calcium, phosphorus, and protein. A
hen’s nutritional condition affects nest
initiation rate, clutch size, and
subsequent reproductive success
(Connelly et al. 2000a). This
information indicates that grazing by
livestock could reduce the suitability of
breeding and brood-rearing habitat,
subsequently negatively affecting sagegrouse populations (Braun 1987, Dobkin
1995, Beck and Mitchell 2000).
Exclosure studies have demonstrated
that domestic livestock grazing also
reduces water infiltration rates and
cover of herbaceous plants and litter, as
well as compacting soils and increasing
soil erosion (Braun 1998). This results
in a change in the proportion of shrub,
grass, and forb components in the
affected area, and an increased invasion
of exotic plant species that do not
provide suitable habitat for sage-grouse
(Miller and Eddleman 2000). Hulet
(1983, as cited in Connelly et al. 2000a)
found that heavy grazing could lead to
increases in ground squirrels that
depredate sage-grouse nests. Thus,
important factors of livestock operations
related to impacts on sage-grouse
include stocking levels, season of use,
and utilization levels.
Other consequences of grazing
include several related to livestock
trampling. Outright nest destruction by
livestock trampling does occur and the
presence of livestock can cause sagegrouse to abandon their nests
(Rasmussen and Griner 1938, Patterson
1952, Call and Maser 1985, Crawford et
al. 2004). Call and Maser (1985) indicate
that forced movements of cattle and
sheep could have significant effects on
nesting hens and young broods caught
in the path of these drives. Livestock
may also trample sagebrush seedlings
thereby removing a source of future
sage-grouse food and cover (Connelly et
al. 2000a), and trampling of soil by
livestock can reduce or eliminate
biological soil crusts making these areas
susceptible to cheatgrass invasion (Mack
1981 as cited in Miller and Eddleman
2000; Young and Allen 1997; Forman
and Alexander 1998).
Livestock grazing may also compete
directly with sage-grouse for rangeland
resources. Cattle are grazers, feeding
mostly on grasses, but they will make
seasonal use of forbs and browse species
like sagebrush (Vallentine 2001).
Domestic sheep are intermediate feeders
making high use of forbs, but also use
a large volume of grass and browse
species like sagebrush (Vallentine 2001).
Pedersen et al. (2003) documented
sheep consumption of rangeland forbs
in areas where sage-grouse occur. The
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effects of direct competition between
livestock and sage-grouse depend on
condition of the habitat and grazing
practices, and thus vary across the range
of the species. For example, Aldridge
and Brigham (2003) suggest that poor
livestock management in mesic sites,
which are considered limited habitats
for sage-grouse in Alberta, results in a
reduction of forbs and grasses available
to sage-grouse chicks, thereby affecting
chick survival.
Some effects of livestock grazing may
have positive consequences for sagegrouse. Evans (1986) found that sagegrouse used grazed meadows
significantly more during late summer
than ungrazed meadows because grazing
had stimulated the regrowth of forbs.
Klebenow (1981) noted that sage-grouse
sought out and used openings in
meadows created by cattle grazing in
northern Nevada. Finally both sheep
and goats have been used to control
invasive weeds (Mosely 1996 as cited in
Connelly et al. 2004; Olson and
Wallander 2001; Merritt et al. 2001) and
woody plant encroachment (Riggs and
Urness 1989) in sage-grouse habitat.
Although there are few studies which
directly examine the effects of livestock
grazing on greater sage-grouse, and no
studies on a rangewide scale, the expert
panel ranked grazing as a potential
extinction risk factor. This ranking
incorporates not only the direct effects
of grazing, but all associated activities,
such as vegetation management,
fencing, overuse of riparian habitats by
domestic livestock, etc. The expert
panel also noted that the recovery of
greater sage-grouse populations from the
1930s to the 1950s occurred during a
period of a reduction in livestock
grazing as well as a change in weather
resulting in wetter conditions. However,
the panel also noted that proper grazing
management may be a beneficial tool for
enhancing greater sage-grouse habitats
where maintenance and enhancement of
these habitats is identified as an
objective, although this has not been
rigorously tested.
Free-roaming horses and burros have
been a component of sagebrush and
other arid communities since they were
brought to North America at the end of
the 16th century (Wagner 1983; Beever
2003). About 31,000 wild horses occur
in 10 western States, with herd sizes
being largest in States with the most
extensive sagebrush cover (Nevada,
Wyoming, and Oregon; Connelly et al.
2004). Burros occur in five western
States, with about 5,000 of these present
(Connelly et al. 2004). Due to
physiological differences, a horse
consumes 20 to 65 percent more forage
than would a cow of equivalent body
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mass (Wagner 1983; Menard et al. 2002).
We are unaware of any studies that
directly address the impact of wild
horses or burros on sagebrush and sagegrouse. However some authors have
suggested that wild horses could
negatively impact important meadow
and spring brood-rearing habitats used
by sage-grouse (Crawford et al. 2004;
Connelly et al. 2004). Other impacts
from wild horse grazing may be similar
to the impacts resulting from domestic
livestock in sagebrush habitats, but
these have not been documented.
Sagebrush removal to increase
herbaceous forage and grasses for
domestic and wild ungulates is a
common practice in sagebrush
ecosystems (Connelly et al. 2004).
Removal from chemical and mechanical
means has been discussed previously.
The elimination of sagebrush is usually
followed with rangeland seedings to
improve forage for livestock grazing
operations (Knick et al. 2003; Connelly
et al. 2004). Large expanses of sagebrush
have been removed and reseeded with
non-native grasses, such as crested
wheatgrass (Agropyron cristatum), to
increase forage production on public
lands (Shane et al. 1983, cited in Knick
et al. 2003; Connelly et al. 2004). These
treatments had the effect of reducing or
eliminating many native grasses and
forbs present prior to the seedings. Sagegrouse are affected indirectly through
the loss of native forbs that serve as food
and the loss of native grasses that
provide concealment or hiding cover
within the understories of the former
sagebrush stands (Connelly et al. 2004).
BLM reports that they no longer
implement actions that result in
removing large expanses of sagebrush
and reseeding with non-native grasses
(BLM 2004a).
Water developments for the benefit of
livestock on public lands are common
(Connelly et al. 2004). Development of
springs and other water sources to
support livestock in upland shrubsteppe habitats can artificially
concentrate domestic and wild
ungulates in important sage-grouse
habitats, thereby exacerbating grazing
impacts in those areas through
vegetation trampling, etc. (Braun 1998).
Diverting the water sources has the
secondary effect of changing the habitat
present at the water source before
diversion. This could result in the loss
of either riparian or wet meadow habitat
important to sage-grouse as sources of
forbs or insects.
Mining
Development of mines within the
distribution of the sage-grouse began
before 1900 (Robbins and Ward 1994,
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cited in Braun 1998). Surface mining for
any mineral resource (coal, uranium,
copper, bentonite, gypsum, oil shale,
phosphate, limestone, gravel, etc.) will
result in direct habitat loss for sagegrouse if the mining occurs in occupied
sagebrush habitats. Direct loss of sagegrouse habitat can also occur if the
overburden and/or topsoil resulting
from mining activities are stored in
sagebrush habitats. The actual effect of
this loss depends on the quality,
amount, and type of habitat disturbed,
the scale of the disturbance, and if nonbreeding habitat is affected, the
availability of adjacent habitats (Proctor
et al. 1983; Remington and Braun 1991).
Sage-grouse habitat losses from all
sources of mining have occurred in Utah
(Beck et al. 2003), Colorado (Braun
1986), and Wyoming (Hayden-Wing
Associates 1983), but the actual amount
of habitat loss has not been tabulated.
Sagebrush habitat has also been lost to
mining in other states within the range
of sage-grouse although reliable
estimates of the amount of loss are not
available.
Mined land reclamation is required by
either the Federal or State governments
in the greater sage-grouse states and
Canada (Smyth and Dearden 1998). Due
to the relatively recent nature of federal
coal and Canadian regulation (27 and 41
years, respectively; Smyth and Dearden
1998) there is limited long-term
monitoring data. The laws generally
allow for a change in post-mining land
use from pre-mining conditions, and
restoration of pre-mining sagebrush
habitat may not occur if the surface
owner determines an alternative habitat
type is preferable. However, Federal
coal reclamation requires restoration of
diversity and density standards if the
private landowner agrees. Early efforts
to restore sage-grouse habitats on mined
lands focused on creating artificial leks,
which was largely unsuccessful (Tate et
al. 1979; Proctor et al. 1983). Most
efforts now rely on seasonal restrictions
for lek destruction and restoration of
sagebrush habitats (Proctor et al. 1983;
Parrish and Anderson 1994). Regulation
of non-coal mining in the United States
is at the discretion of the individual
States, and may or may not include
wildlife habitat restoration as a criterion
(Pat Deibert, U.S. Fish and Wildlife
Service, pers. comm. 2004).
New vegetation types including exotic
species may become established on
mined areas (Moore and Mills 1977),
altering their suitability for sage-grouse.
Temporary habitat loss can stem from
intentional planting to minimize erosion
or for nurse crops (those crops planted
to create suitable microhabitat
conditions for the desired vegetative
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species). The length of this temporary
conversion depends on the life of the
mine, the success of reclamation, and
whether or not reclamation is
concurrent with mining disturbance. If
reclamation plans call for the permanent
conversion of the mined area to a
different habitat type (e.g., agriculture)
the habitat loss becomes permanent.
Invasive exotic plants may also establish
on the disturbed surfaces. Removal of
the overburden and target mineral may
result in changes in topography,
subsequently resulting in changes in
microclimates and microhabitats (Moore
and Mills 1977). Significant
topographical changes can affect the
ability to successfully restore the mined
area to pre-existing vegetative
conditions (Moore and Mills 1977).
Additional habitat losses can occur if
supporting infrastructure, such as roads,
railroads, utility corridors, etc., become
permanent landscape features after
mining and reclamation are completed
(Moore and Mills 1977).
In Wyoming and Montana an
estimated 38,833 ha (96,000 ac) of
disturbed Federal and non-Federal
surface are associated with existing coal
mining operations (Kermit Witherbee,
Bureau of Land Management, pers.
comm. 2004). Over the next ten years,
it has been estimated that approximately
20,243 ha (50,000 ac) will be disturbed
for coal mining activities. This is less
than 1 percent of the Connelly et al.
(2004) assessment area. Of that, 14,170
ha (35,000 ac) should be reclaimed
within the same time-period, resulting
in a net annual disturbance of 607 ha
(1,500 ac). The actual impact to sagegrouse may be longer, as it takes 15 to
30 years for sagebrush regeneration to
usable conditions (Connelly and Braun
1997). There will likely be additional
losses of sagebrush habitat in other
states as a result of mining activities (all
types) although we are unable to
quantify this.
Mining infrastructure, such as roads,
railroads, powerlines, etc., may impact
sage-grouse, although those effects are
not expected to be different than
previously described. Presumably,
direct habitat loss will not be as large
from subsurface mining. However, the
amount of supporting infrastructure and
indirect effects may be similar as for
surface mines (Thomas and Leistritz
1981). Other indirect effects from
mining can include reduced air quality
from gaseous emissions and fugitive
dust, degradation of surface water
quality and quantity, changes in
vegetation, topography, land-use
practices, and disturbance from noise,
ground shock and human presence, and
mortality from collision with mining
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equipment (Moore and Mills 1977;
Brown and Clayton 2004). Gaseous
emissions, created from the operation of
heavy equipment, trains, etc., are
usually quickly dissipated in the windy,
open areas typical of sagebrush. Fugitive
dust could affect local vegetative and
insect resources through coating
important respiratory surfaces. In
extreme cases, plant photosynthesis
may be restricted (Moore and Mills
1977). This may result in reduced food
and cover resources for sage-grouse.
Fugitive dust may also affect sagegrouse through direct irritation of
mucus membranes and/or exposure to
toxic minerals that are otherwise
trapped in the soils (Moore and Mills
1977). Most large surface mines are
required to control fugitive dust, so
these impacts are probably limited.
Water quality can generally be
reduced through increased sediment
loads, leaching of toxic compounds or
elements from exposed ore, waste rock
and overburden, introduction of excess
nutrients from blasting and fertilizers, or
introduction of pathogens from septic
systems and waste disposal associated
with mining activity (Moore and Mills
1977). Contamination of water supplies
through toxic elements can result in
either direct mortality to wildlife, or
long-term chronic health problems.
Pathogens can also have a similar
detrimental effect on wildlife. Water
supplies may decline either through
direct removal of wetlands from mining
activity or reduction from use for
fugitive dust suppression. Remaining
wetlands may subsequently receive
increased use from other wildlife or
domestic livestock, resulting in habitat
degradation. In Nevada, extensive dewatering of ground water results from
open pit gold mining (Kevin Kritz, U.S.
Fish and Wildlife Service, pers. comm.
2004). The actual impact of these effects
on sage-grouse is unknown. Since sagegrouse do not require free water
(Schroeder et al. 1999), we anticipate
that impacts to water quality from
mining activities have minimal
population-level effects. The possible
exception is degradation of riparian
areas, which could result in brood
habitat loss.
If blasting is necessary for removal of
overburden or the target mineral,
ground shock may occur. The full
effects of ground shock on wildlife are
unknown, but given its temporary
duration and localized impact area,
impacts are considered minimal (Moore
and Mills 1977). One possible exception
is the repeated use of explosives during
lekking or nesting, which could
potentially result in nest and/or lek
abandonment (Moore and Mills 1977).
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We are unaware of any research on the
impact of these factors to sage-grouse.
Noise from mining activities may limit
sage-grouse use of surrounding suitable
habitat. In a study of sharp-tailed grouse
(Pedioecetes phasianellus) leks in
northeastern Wyoming, data suggested
that noise from an adjacent coal mine
adversely affected leks by masking
vocalizations, which resulted in
reduced female attendance and yearling
recruitment (Amstrup and Phillips
1977). In that study, the authors found
that mining noise was continuous across
days and seasons, and did not dissipate
as it traveled across the adjacent
landscape. The effects on sage-grouse of
noise from mining are unknown, but
sage-grouse also depend on acoustical
signals to attract females to leks (Gibson
and Bradbury 1985; Gratson 1993). If
noise does interfere with mating
displays, and thereby female
attendance, younger males will not
attend the lek, and eventually leks will
become inactive (Amstrup and Phillips
1977; Braun 1986).
Mining can also impact sage-grouse
through the increased presence of
human activity, either through
avoidance of suitable habitat adjacent to
mines or through collisions with
vehicles associated with mining
operations (Moore and Mills 1977;
Brown and Clayton 2004). An increased
human population in an area, as a result
of mine extraction activities, may result
in increased hunting pressure, both
legal and poaching (Moore and Mills
1977). Although these effects have not
been quantified on sage-grouse
populations, the State of Wyoming
requires coal operators to educate their
employees about wildlife regulations
when they are hired. Sage-grouse may
also be at increased risk for collision
with vehicles simply due to the
increased traffic associated with mining
activities and transport (Moore and
Mills 1977; Brown and Clayton 2004).
However, we were unable to find any
information regarding increased
mortality of sage-grouse near mines as a
result of this effect.
We were only able to locate a few
studies that specifically examined the
effects of coal mining on greater sagegrouse (Tate et al. 1979; Hayden-Wing
Associates 1983; Braun 1986;
Remington and Braun 1991; Brown and
Clayton 2004). In a study in North Park,
Colorado, overall population numbers of
sage-grouse were not reduced, but there
was a reduction in the number of males
attending leks within 2 km (0.8 miles)
of three coal mines, as well as a failure
to recruit yearling males to these
existing leks (Braun 1986; Remington
and Braun 1991). New leks formed
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further from the mining disturbance
(Remington and Braun 1991).
Additionally, some leks adjacent to
mine areas that had been abandoned at
the onset of mining were re-established
when mining activities ceased,
suggesting disturbance rather than loss
of habitat was the limiting factor. There
was no decline in hen survival in a
population of sage-grouse near large
surface coal mines in northeastern
Wyoming and nest success was
apparently unaffected by the adjacent
mining activity (Brown and Clayton
2004). However, the authors concluded
that this population could only be
sustained by aggressive land
management to maintain suitable
habitat, as the existing habitat will
become fragmented by continued
mining.
Braun (1998) concluded that surface
coal mining and all associated activities
have negative short-term impacts on
sage-grouse numbers and habitats near
the mines. Sage-grouse will reestablish
on mined areas once mining has ceased,
but there is no evidence that population
levels will reach their previous size.
Additionally, the time span for
population re-establishment may be 20
to 30 years (Braun 1998). Hayden-Wing
Associates (1983) concluded that the
loss of one or two leks in a regional area
from coal mining was likely not limiting
to local populations in their study on
the Caballo Rojo Mine in northeastern
Wyoming. However, if several leks are
affected, local population numbers may
decline (Hayden-Wing Associates 1983).
Hard rock mining impacts greater
sage-grouse at the local level. The expert
panel identified hard rock mining as a
threat of relatively low importance
compared to other threats. The effect of
hard rock mining, when considered
independently of other threats to the
species, is likely of relatively low
importance to the status of the species
range-wide.
Non-Renewable and Renewable Energy
Development
Non-renewable energy development
(petroleum products, coal) has been
occurring in sage-grouse habitats since
the late 1800s (Connelly et al. 2004).
Interest in development of oil and gas
has been sporadic and typically focused
in limited geographical areas (Braun et
al. 2002). The re-authorization of the
Energy Policy and Conservation Act in
2000 dictated re-inventory of Federal oil
and gas reserves, which identified
extensive reserves in the Greater Green
River Basin of Colorado, Utah, and
Wyoming, the San Juan Basin of New
Mexico and Colorado, and the Montana
Thrust Belt and the Powder River Basin
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of Wyoming and Montana (Connelly et
al. 2004). All of these basins are located
in primarily sagebrush-dominated
landscapes (Knick et al. 2003; Connelly
et al. 2004).
The development of oil and gas
resources requires surveys for
economically recoverable reserves,
construction of well pads and access
roads, subsequent drilling and
extraction, and transport of oil and gas,
typically through pipelines. Ancillary
facilities can include compressor
stations, pumping stations and electrical
facilities (Connelly et al. 2004). Surveys
for recoverable resources occur
primarily through seismic activities,
using vibroesis buggies (thumpers) or
shothole explosives. Well pads vary in
size from 0.10 ha (0.25 ac) for coalbed
natural gas wells in areas of level
topography to greater than 7 ha (17.3 ac)
for deep gas wells (Connelly et al.
(2004). Pads for compressor stations
require 5 to 7 ha (12.4 to 17.3 ac;
Connelly et al. 2004). Well densities and
spacing are typically designed to
maximize recovery of the resource and
are administered by State and Provincial
oil and gas agencies and the BLM (on
Native American lands) (Connelly et al.
2004). Based on their review of project
EIS’s, Connelly et al. (2004) concluded
that the economic life of a coalbed
methane well averages 12 to 18 years
and 20 to 100 years for deep oil and gas
wells.
Connelly et al. (2004) reviewed oil
and gas development environmental
impacts statements to determine that
approximately 4,000 oil and gas wells
have been approved in the Green River
Basin of Wyoming, Colorado and Utah,
with approval of an additional 9,700
wells pending. In the Powder River
Basin of Wyoming and Montana, 15,811
wells have been approved, and an
additional 65,635 are being considered
(Connelly et al. 2004). In the Uinta/
Piceance Basin of Utah, 3,500 wells
have been drilled and another 2,600 are
pending (Connelly et al. 2004).
Approximately 3,000 more permits will
be issued annually for Montana,
Colorado, Utah and Wyoming (Connelly
et al. 2004). Nine million hectares (22.2
million ac) in Montana, Wyoming,
Colorado, Utah and New Mexico are
available for oil and gas leasing, and
approval for 29,000 new oil and gas
leases is anticipated by 2005 (BLM
2003c). The BLM has not quantified the
portion of these lands that provide sagegrouse habitat. In September, 2004, the
Utah BLM office sold 279 oil and gas
leases, incorporating approximately
195,000 ha (481,000 ac) on both BLM
and Forest Service surfaces (BLM
2004c). Based on a review of National
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Environmental Policy Act (NEPA)
documents, there are 27,231 existing oil
and gas wells in sagebrush habitats, and
another 78,938 to 79,647 are proposed.
Potential impacts to sage-grouse and
sagebrush habitats from the
development of oil and gas resources
include direct habitat loss, habitat
fragmentation from vegetation removal,
roads, powerlines and pipeline
corridors, noise, gaseous emissions,
changes in water availability and
quality, and increased human presence
(Suter 1978; Aldridge 1998; Braun 1998;
Aldridge and Brigham 2003; Knick et al.
2003; Lyon and Anderson 2003;
Connelly et al. 2004). We found no
information regarding the effects of
gaseous emissions produced by oil and
gas development. Presumably, as with
surface mining, these emissions are
quickly dispersed in the windy, open
conditions of sagebrush habitats (Moore
and Mills 1977), minimizing the
potential effects on sage-grouse.
Direct habitat losses result from
construction of well pads, roads,
pipelines, powerlines, and potentially
through the crushing of vegetation
during seismic surveys. For example,
coal-bed methane development in the
Powder River Basin of Wyoming is
expected to result in the loss of an
additional 21,711 ha (53,626 ac) of
sagebrush habitat by 2011 (BLM 2003a).
This is less than 1 percent of the
Connelly et al. (2004) assessment area.
Current sage-grouse habitat loss in the
Basin from coal-bed methane is
estimated at 2,024 ha (5,000 ac) (Braun
et al. 2002).
Connelly et al. (2004) estimated that
habitat loss from all existing natural gas
pipelines in the conservation
assessment area was a minimum of
4,740 km2 (1,852 mi2, 1.17 million ac,
474,000 ha; less than 1 percent of their
assessment area). Proposed pipelines to
support future oil and gas developments
are not included in this figure. Although
reclamation of short-term disturbances
is often concurrent with project
development, habitats would not be
restored to pre-disturbance conditions
for an extended period (BLM 2003a).
The amount of direct habitat loss within
an area will ultimately be determined by
well densities and the associated loss
from ancillary facilities. Most Federal
land management agencies impose
stipulations to preclude exploration in
suitable habitat during the nesting
season.
Reclamation of areas disturbed by oil
and gas development can be concurrent
with field development. As disturbed
areas are reclaimed, sage-grouse may
repopulate the area. However, there is
no evidence that populations will attain
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their previous size, and re-population
may take 20 to 30 years, as habitat
conditions are not immediately restored
(Braun 1998). For most developments,
return to pre-disturbance population
levels is not expected due to a net loss
and fragmentation of habitat (Braun et
al. 2002). After 20 years, sage-grouse
have not recovered to pre-development
numbers in Alberta, even though well
pads in these areas have been reclaimed
(Braun et al. 2002). In some reclaimed
areas, sage-grouse have not returned
(Aldridge and Brigham 2003).
Habitat fragmentation impacts to sagegrouse resulting from vegetation
removal, roads, powerlines and pipeline
corridors are similar to those described
previously. Fragmentation resulting
from oil and gas development and the
associated introduced infrastructure
may have more effects on greater sagegrouse than the associated direct habitat
losses, which may not be extensive. For
example, of the total 904,109 ha
(2,234,103 ac) project area in the
Powder River Basin, an estimated
23,735 ha (58,625 ac) of habitat will be
directly disturbed by well construction
(BLM 2003a). However, up to 8,579 km
(5,311 mi) of powerlines, 28,572 km
(17,754 mi) of roads, and 33,548 km
(20,846 mi) of pipelines are also
proposed for this project. The presence
of these ancillary facilities may preclude
sage-grouse from using suitable adjacent
habitats (see previous discussion). As
previously discussed, roads associated
with oil and gas development were
suggested to be the primary impact to
greater sage-grouse due to their
persistence and continued use even
after drilling and production has ceased
(Lyon and Anderson 2003).
Noise can drive away wildlife, cause
physiological stress and interfere with
auditory cues and intraspecific
communication, as discussed
previously. Aldridge and Brigham
(2003) reported that, in the absence of
stipulations to minimize the effects,
mechanical activities at well sites may
disrupt sage-grouse breeding and
nesting activities. Hens bred on leks
within 3 km (1.9 miles) of oil and gas
development in the upper Green River
Basin of Wyoming selected nest sites
with higher total shrub canopy cover
and average live sagebrush height than
hens nesting away from disturbance
(Lyon 2000). The author hypothesized
that exposure to road noise associated
with oil and gas drilling may have been
one cause for the difference in habitat
selection. However, noise could not be
separated from the potential effects of
increased predation resulting from the
presence of a new road. Above-ground
noise is typically not regulated to
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mitigate effects to sage-grouse or other
wildlife (Connelly et al. 2004). Ground
shock from seismic activities may affect
sage-grouse if it occurs during the
lekking or nesting seasons (Moore and
Mills 1977). We are unaware of any
research on the impact of ground shock
to sage-grouse.
Water quality and quantity may be
affected in oil and gas development
areas. The impacts are similar relative to
the contamination of water supplies by
toxic elements and pathogens (see
previous discussion), with the addition
of potential oil contamination in settling
and/or condensate ponds. In many large
field developments, water produced
during the gas dehydration process is
stored in tanks, removing this potential
threat. Where oil contamination of open
water pits has occurred, no sage-grouse
mortalities are known (Pedro Ramirez,
U.S. Fish and Wildlife Service, pers.
comm. 2004). Water may also be
depleted from natural sources for
drilling or dust suppression purposes.
Remaining wetlands may subsequently
receive increased use from other
wildlife or domestic livestock, resulting
in habitat degradation. Since, sagegrouse do not require free water
(Schroeder et al. 1999) we anticipate
that impacts to water quality from
mining activities have minimal effects
on them. The possible exceptions are a
reduction in habitat quality (e.g.,
trampling of vegetation, changes in
water filtration rates), habitat
degradation (e.g., poor vegetation
growth), which could result in brood
habitat loss. However, we have no data
to suggest this is a limiting factor to
sage-grouse.
Water produced by coal-bed methane
drilling may benefit sage-grouse through
expansion of existing wetland and
riparian areas, and creation of new areas
(BLM 2003a). These habitats could
provide additional brood rearing and
summering habitats for sage-grouse.
However, based on the recent discovery
of West Nile virus in the Powder River
Basin, and the resulting mortalities of
sage-grouse (Naugle et al. 2004), there is
concern that produced water could be a
negative impact if it creates suitable
breeding reservoirs for the mosquito
vector of this disease. There is currently
no evidence supporting a link between
West Nile virus and coal-bed methane
development (Naugle et al. 2004).
Produced water could also result in
direct habitat loss through prolonged
flooding of sagebrush areas, or if the
discharged water is of poor quality
because of high salt or other mineral
content, either of which could result in
the loss of sagebrush and/or grasses and
forbs necessary for foraging broods
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(BLM 2003a). We do not have
quantitative information on the extent of
habitat influenced by produced water,
nor the net effects on sage-grouse
populations.
Increased human presence resulting
from oil and gas development can also
impact sage-grouse either through
avoidance of suitable habitat, disruption
of breeding activities, or increased
hunting and poaching pressure
(Aldridge and Brigham 2003; Braun et
al. 2002; BLM 2003a). Sage-grouse may
also be at increased risk for collision
with vehicles simply due to the
increased traffic associated with oil and
gas activities (BLM 2003a).
Only a few studies have examined the
effects of oil and gas development on
sage-grouse. While each of these studies
reported sage-grouse population
declines, specific causes for the negative
impacts were not determined. In
Alberta, Canada, the development of
well pads and associated roads in the
mid-1980s resulted in the abandonment
of three lek complexes within 200 m
(220 yd) of these features (Braun et al.
2002). Those leks have not been active
since that time. A fourth lek complex
has gone from three to one lek with
fewer numbers of sage-grouse on it
(Braun et al. 2002). The well pads have
since been reclaimed, but sage-grouse
numbers have not recovered (we do not
have information on post-reclamation
vegetation). Subsequent to the
development of the Manyberries Oil
Field in high quality sage-grouse habitat
in Alberta, male sage-grouse counts fell
to the lowest known level (Braun et al.
2002). Two additional leks were directly
disturbed, and neither of these leks has
been active within the past 10 years
(Braun et al. 2002). The development of
oil reserves in Jackson County,
Colorado, was concurrent with decline
of sage-grouse numbers in the oil field
area (Braun 1998). Sage-grouse
populations still occur in at least one
long-term oil field development in
Colorado where leks are not within lineof-sight of an active well or powerline
(Braun et al. 2002). Although the
number of active leks has declined in
this field, sage-grouse have been
consistently documented there since
1973.
Of particular relevance to estimating
oil and gas development impacts is the
fidelity of sage-grouse hens to nesting
and summer brood rearing areas
demonstrated by Lyon and Anderson
(2003). Hens that have successfully
nested will return to the same areas to
nest every year. If these habitats are
affected by oil and gas development,
there is a strong potential that
previously successful hens will return
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but not initiate nests (Lyon 2000).
Depending on the number of hens
affected, local populations could
decline.
Over 200 known leks occur within the
coal-bed methane development area in
Powder River Basin of northeastern
Wyoming. Those leks have been affected
by direct habitat losses, higher human
activity, and powerlines (Braun et al.
2002). Since initiation of field
development, 28 percent of known sagegrouse habitat within the project area
has been affected. On 30 leks within 0.4
km (0.25 mi) of a well, significantly
fewer males have been recorded when
compared with other, undisturbed leks.
The rate of recruitment to the male
breeding population on these leks is
also lower when compared with
increases on less disturbed leks (Braun
et al. 2002; BLM 2003a). Powerlines
have been constructed within 0.4 km
(0.25 mi) of 40 leks within the project
area. These leks also have lower
recruitment rates, possibly due to
increased raptor predation. Lower
numbers of grouse have also been
counted on leks within 1.6 km (1 mi) of
compressor stations (Braun et al. 2002).
In the Final EIS for this project, the BLM
stated that local sage-grouse extirpations
may occur as a result of the synergistic
effects of all aspects of coal-bed
methane development in this area (BLM
2003a).
In the Jonah natural gas field in
southwestern Wyoming, 10 of 24 leks in
or near the project area are no longer
active, although data collection has not
been consistent on 4 of those leks (BLM
2004d). Two leks were destroyed by the
placement of well pads on the leks, and
re-establishment of those leks at that
location is not anticipated (BLM 2004d).
Based on nest initiation and habitat
fidelity results, Lyon and Anderson
(2003) concluded that impacts occur
greater than 0.4 km (0.25 mi) from well
pads, thus current no-surface-occupancy
buffers around active sage-grouse based
on that distance may not be adequate to
avoid adverse effects. However, to our
knowledge no information exists
concerning whether leks are
subsequently re-established.
Protective wildlife stipulations are
typically placed on individual oil and
gas leases at the time of sale, including
seasonal and temporal restrictions
around important sage-grouse habitats
(Connelly et al. 2004). The protection
afforded by these stipulations depends
on the specific prescriptions, and
whether or not important sage-grouse
habitats are identified in the area
proposed for development. Additional
stipulations may be placed on oil and
gas development, as identified in BLM
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land use plans, and through the NEPA
process. Most lease stipulations have
exception, waiver, and/or modification
criteria that are included in BLM land
use plans. Waivers, which are a
permanent exemption, and
modifications, which are changes to the
terms of a stipulation, are described by
BLM as being rare, and they also may
require public notice (BLM 2004a).
Exceptions are a one-time exemption to
a lease stipulation. An example cited by
BLM is a timing stipulation designed to
avoid activity in wintering habitat,
which could be the subject of an
exception in a mild winter if a company
requests an early entry to drill and BLM
or the local wildlife agency make an onthe-ground survey and find sage-grouse
are not using the winter habitat or have
left the area earlier than normal (BLM
2004a).
On June 22, 2004, BLM issued an
Instruction Memorandum (IM)
establishing policy that BLM field
offices consider Best Management
Practices (BMPs) for oil and gas and
other fluid mineral operations as part of
NEPA documents. The purpose of the
BMPs is to mitigate anticipated effects
to surface and subsurface resources, and
to encourage operators to consider
BMPs during the application process for
permits to drill (BLM 2004e). BLM
expects that wells drilled using BMPs
will have fewer impacted acres of
sagebrush habitat than has been
estimated in EISs (e.g., for the Powder
River EIS) and consequently there will
be less habitat loss and fragmentation
(BLM 2004a). The effect of the IM and
the BMPs is difficult to predict.
Although the IM makes it BLM policy
to consider the BMPs, their adoption is
voluntary, not mandatory. The Service
is available to provide BLM with
technical assistance as they implement
BMPs.
The Forest Service can place
additional seasonal or temporal
stipulations to protect sage-grouse on oil
and gas developments on lands they
manage (Forest Service in litt. 2004).
Development of oil and gas resources on
private lands does not always require
mitigation (Braun 1998; Connelly et al.
2004), and most States do not place
wildlife stipulations on development
occurring on their lands. In Canada, no
current legislation commits energy
development to adhere to
recommendations by Alberta Fish and
Wildlife to reduce impacts of drilling in
important sage-grouse habitats (Braun et
al. 2002).
Renewable energy resources, such as
windpower and geothermal energy,
require many of the same features for
construction and operation as do non-
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renewable energy resources. Therefore,
we anticipate that potential impacts
from direct habitat losses, habitat
fragmentation through roads and
powerlines, noise, and increased human
presence (Connelly et al. 2004) will
generally be the same as already
discussed for nonrenewable energy
development. Windpower may have
additional mortalities resulting from
sage-grouse flying into turbine rotors or
meteorological towers (Erickson et al.
2001). One sage-grouse was found dead
within 45 m (148 ft) of a turbine on the
Foote Creek Rim wind facility in southcentral Wyoming, presumably from
flying into a turbine (Young et al. 2003).
During 3 years of monitoring operation,
this is the only known sage-grouse
mortality at this facility. Sage-grouse
hens with broods have been observed
using Foote Creek Rim, under the
turbines, during surveys for other
species (David Young, WEST, Inc., pers.
comm. 2004). Mortalities at other
facilities within sagebrush habitats are
unknown and may not be monitored.
However, most developed windpower
facilities are not located within
sagebrush habitats, and the average
above-ground height of windpower
facilities is 107 m (350 ft; Erickson et al.
2001), above the normal height of shortdistance sage-grouse flights (Johnson et
al. 2000).
Fifteen thousand wind turbines were
projected to be operational in the United
States by the end of 2001, not including
the wind turbines located in California
(Erickson et al. 2001). On September 10,
2004, the BLM released a draft
programmatic EIS regarding the
modification of land use plans in
western States (including all States
within the extant sage-grouse range) for
the increased development of wind
resources (BLM 2004f). Locations and
potential impacts to sage-grouse were
not discussed in specific detail.
Development of hydropower energy
may impact sage-grouse through direct
habitat losses, and increases in human
traffic and activity if a resulting
reservoir provides recreational
resources. During construction, there
may also be additional impacts of
fugitive dust, gaseous emissions, road
construction, increased traffic, and
increased poaching activities. We do not
anticipate that the potential for impacts
from these activities to sage-grouse are
different from those discussed
previously for infrastructure issues.
During the mid-1900s, a number of
hydroelectric dams were developed on
the Columbia and Snake Rivers in
Washington and Oregon. More than 400
dams were constructed on the Columbia
River system alone. The irrigation
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projects formed by these reservoirs
precipitated conversion of large
expanses of upland shrub-steppe habitat
in the Columbia Basin for irrigated
agriculture adjacent to the rivers as
discussed previously in the Agriculture
section (65 FR 51578). The creation of
these reservoirs also directly inundated
hundreds of kilometers of riparian
habitats used by sage-grouse broods
(Braun 1998). We were unable to find
any information regarding the amount of
sage-grouse habitat affected by
hydropower projects in other areas of
the species range beyond the Columbia
Basin. We do not anticipate that future
dam construction will result in large
losses of sagebrush habitats. Although
dam removal has been proposed for
some areas, upland restoration goals,
and the potential benefit to sage-grouse,
are unknown.
The development of geothermal
energy requires intensive human
activity during field development (Suter
1978). Toxic gases may be released, and
the type and effect of these gases
depends on the geological formation in
which drilling occurs. The amount of
water necessary for drilling and
condenser cooling may be high (Suter
1978). Therefore, water depletions may
be a concern if such depletions result in
the loss of limiting brood-rearing
habitats (see discussion above).
Geothermal activity on public lands is
primarily in California, with over 23
producing leases. Nevada, and Utah also
have producing leases (BLM 2004g).
Impacts to sage-grouse were not
identified.
We were unable to find any
information regarding the commercial
development of solar energy. We
anticipate the effects from this resource
will be those associated with direct
habitat loss, fragmentation, roads,
powerlines, increased human presence,
and disturbance during facility
construction, where solar energy
development occurs.
Energy development was identified by
the expert panel as the most significant
extinction risk to the greater sage-grouse
in the eastern portion of its range
(Colorado, Wyoming and Montana).
Their primary concern was the rapidity
of development and the persistent
demand for petroleum products. On a
rangewide scale, however, energy
development alone (not including the
infrastructure associated with it—see
Roads and Railroads above) ranked as
the sixth most important extinction risk
factor. To better understand the actual
mechanism by which energy
development affects greater sage-grouse,
the panel suggested excluding some
areas from extraction activities so that
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comparative analyses could be
conducted.
Fire
The effects of fire on sagebrush
habitats vary according to the species of
sagebrush present, other plant species
present (e.g., the understory) and the
frequency, size and intensity of fires.
Widely variable estimates of mean fire
intervals have been described in the
literature: 35 to 100 years (Brown 2000),
greater than 50 years for big sagebrush
communities (McArthur 1994), 12 to 15
years for mountain big sagebrush (Miller
and Rose 1999), 20 to 100 years (Peters
and Bunting 1994), 10 to 110 years
depending on sagebrush species and
specific geographic area (Kilpatrick
2000), and 13 to 25 years (Frost 1998
cited in Connelly et al. 2004).
In general, fire tends to extensively
reduce the sagebrush component within
the burned areas. Big sagebrush (A.
tridentata spp.), the most widespread
species of sagebrush (McArthur 1994), is
killed by fire. It does not re-sprout after
burning (Agee 1994, Braun 1998,
Wrobleski and Kauffman 2003), and can
take as many as 30 to 50 years to
recolonize an area (Agee 1994, Telfer
2000, Wambolt et al. 2001). This
suggests that these sagebrush subspecies
evolved in an environment where
wildfire was infrequent (interval of 30 to
50 years) and patchy in distribution
(Braun 1998). However, as noted by the
expert panel, fire has been an important
component in sagebrush systems.
A characteristic of natural fire in
sagebrush stands is the incomplete
burning that leaves areas of unburned
sagebrush (sometimes referred to as
islands of habitat) (Huff and Smith
2000). Huff and Smith (2000) noted that
these unburned islands appear to be
important to the future recolonization of
the sagebrush community by providing
sources of sagebrush seed. Prior to
settlement by European immigrants, fire
patterns in sagebrush communities were
patchy, particularly in Wyoming big
sagebrush, due to the discontinuous and
limited fuels and unburned islands that
remained after a fire (Miller and
Eddleman 2000).
Connelly et al. (2004) summarized fire
statistics from records obtained for the
sagebrush biome (both wild and
prescribed fires). The total area burned
and the number of fires increased across
the sagebrush ecoregions from 1960 to
2003. In the Southern Great Basin and
Wyoming basins, average fire size
increased. In the 40.5 million ha (100
million ac) sagebrush-steppe ecoregion
(essentially the northern distribution of
sagebrush), or drier sagebrush areas fire
regimes have shifted to more frequent
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fire episodes (Brown 2000). Fire was
identified as the primary factor resulting
in sage-grouse habitat conversion in
Oregon (1.4 million ac; Oregon
Department of Fish and Wildlife in litt.
2004).
In parts of the Great Basin (Nevada,
Oregon and Utah) a decline in fire
occurrence since the late 1800s has been
reported in several studies, which
coincides with fire suppression and
reduction of fuels by introducing
livestock (Touchan et al. 1995, Miller
and Rose 1999, Kilpatrick 2000,
Connelly et al. 2004). Long fire intervals
and fire suppression can result in
increased dominance of woody conifer
species, such as western juniper
(Juniperus occidentalis) (Wrobleski and
Kauffman 2003), resulting in a near total
loss of shrubs and sage-grouse habitat in
localized areas (Miller and Eddleman
2000). Alternatively, invasion of exotic
annuals, such as cheatgrass and
medusahead (Taeniatherum asperum),
has resulted in increases in the
frequency and number of fires within
the range of the greater sage-grouse
(Young and Evans 1973, Brown 2000,
Wrobleski and Kauffman 2003, Connelly
et al. 2004). Following fire, sagebrush
will not re-establish on its own for long
time intervals, while non-native grasses
quickly recover from fire and increase,
effectively preventing sagebrush return.
Management to restore an area to
sagebrush after cheatgrass becomes
established is difficult and usually
ineffective (Paysen et al. 2000). As a
result of this direct relationship between
wildfire and the spread of invasive
plants, large areas of habitat in the
western distribution of the greater sagegrouse have already been converted to
cheatgrass (Connelly et al. 2000c). The
loss of habitat due to establishment of
and dominance by non-native annual
grasses results in the loss of sage-grouse
populations (Connelly et al. 2000c).
Wildfires have removed extensive
areas of sagebrush habitat in recent
years. For example, 30 to 40 percent of
the sage-grouse habitat in southern
Idaho was destroyed in a 5-year period
(1997–2001) due to range fires (Signe
Sather-Blair, U.S. Bureau of Land
Management, quoted in Healy 2001).
The largest contiguous patch of
sagebrush habitat in southern Idaho
occupied approximately 283,000 ha
(700,000 ac), (Michael Pellant, U.S.
Bureau of Land Management, quoted in
Healy 2001). Of that total area, about
202,000 ha (500,000 ac) burned in the
years 1999 to 2001; half of the acres that
burned for the first 3 to 5 years post fire,
but accompanying forbs and surviving
grasses increased biomass production.
In another study, productivity of
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perennial herbs had increased by the
second year post-burn to an average 2.2
times higher on burned verses control
areas (Cook et al. 1994). In a 1998
prescribed burn on the Hart Mountain
National Antelope Refuge, Crawford
(1999) observed little change in species
composition between unburned and
burned areas. In the same general area,
fall burning had no apparent effect on
most primary foods although some
Cichorieae species did increase (Pyle
1992). Fischer et al. (1996) also noted
that vegetative cover of important forbs
in the diets of sage-grouse was similar
in unburned and burned habitat. In a
review of 13 sites that had burned
during a span of 2 to 32 years, Wambolt
et al. (2001) reported that perennial
grasses and forbs did not benefit from
prescribed burning.
A variety of techniques have been
attempted at re-establishing sagebrush
post-fire, with mixed success (Cadwell
et al. 1996, Quinney et al. 1996,
Livingston 1998). Restoration of the
sagebrush biome following a fire has
been complicated not only by the
invasion of exotic annual plant species,
but the difficulty associated with
establishing sagebrush seedlings (Boltz
1994). Wirth and Pyke (2003) reported
that forb response post-fire is dependant
on the forb community pre-burn.
Habitat rehabilitation following fires has
become a major activity in recent years,
increasing from 281 km2 (109 mi2 ) in
1997 to 16,135 km2 (6,230 mi2 ) in 2002
with most treatments in Oregon, Idaho,
and Nevada (Connelly et al. 2004), but
we have no data on the extent of actual
sagebrush restoration.
A clear positive response of greater
sage-grouse to fire has not been
demonstrated (Braun 1998). Call and
Maser (1985) noted that fires could
cause adverse conditions where cover is
limited. Studies of prescribed fire in
mountain big sagebrush at Hart
Mountain National Antelope Refuge
demonstrate short-term benefits in
certain forbs, but the reduction in
sagebrush cover potentially rendered
habitat less suitable for nesting and
brood rearing (Rowland and Wisdom
2002). Similarly, Nelle et al. (2000)
reported that the removal of sage-grouse
nesting and brood-rearing habitat by fire
resulted in no increase in invertebrate
abundance in the first year post-fire and
hence, no benefit for sage-grouse chick
foraging. This loss of nesting habitat
created a long-term negative impact
which would require 20 years of
sagebrush re-growth before sufficient
canopy cover was available for nesting
birds (Nelle et al. 2000). Byrne (2002)
reported the general avoidance of
available burned habitats by nesting,
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brood-rearing, and broodless females.
Connelly et al. (2000c) and Fischer et al.
(1996) found that prescribed burning
did not improve brood rearing habitat in
Wyoming big sagebrush, as forbs did not
increase and insect populations
declined as a result of the treatment.
Hence fire in this sagebrush type may
negatively affect brood rearing habitat
rather than improve it (Connelly and
Braun 1997). However, Klebenow
(1970), Gates (1983, as cited in Connelly
et al. 2000c), Sime (1991 as cited in
Connelly et al. 2000a), and Pyle and
Crawford (1996) all indicated that fire
could improve brood-rearing habitat.
Slater (2003) reported that sage-grouse
using burned areas were rarely found
more than 60 m (200 feet) from the edge
of the burn. In southeastern Idaho,
Connelly et al. (2000c) concluded that,
even though age-grouse populations
were in decline across the study area,
population declines were more severe in
the post-fire years. Fischer et al. (1997)
concluded that habitat fragmentation, as
a result of fire, may influence
distribution or migratory patterns in
sage-grouse. Hulet (1983, as cited in
Connelly et al. 2000a) documented the
loss of leks as a result of fire.
The expert panel ranked wildfire as
the second most important extinction
risk factor for the greater sage-grouse in
western portions of its range (the Great
Basin—Utah, Idaho, Nevada, eastern
Oregon), primarily due to the
subsequent establishment of invasive
species such as cheatgrass (see
following discussion). Since invasive
species has not become the problem in
the eastern part of the greater sagegrouse range, the expert panel did not
rank wildfire as high in that area. Across
the species range, wildfire was
identified as the third most important
extinction risk factor by the expert
panel.
Invasive Species/Noxious Weeds
Invasive species have been defined as
those that are not native to an ecosystem
and whose introduction causes, or is
likely to cause, economic or
environmental harm or harm to human
health (Executive Order 13112, 1999). A
wide variety of plants are considered
invasive within the range of sagebrush
ecosystems that the greater sage-grouse
occupies (Wamboldt et al. 2002,
Crawford et al. 2004, Connelly et al.
2004). Invasive species often cause
declines in native plant populations by
reducing light, water, and nutrients, and
they grow so quickly that they
outcompete other species (Wooten et al.
1996). The rate of spread for noxious
weeds is approximately 931 ha (2,300
ac) per day on BLM lands and 1862 ha
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(4,600 ac) per day on all public lands in
the West (Knick et al. 2003). The area
infested with exotic (non-native)
invasive plants increased from 1.1
million ha (2.7 million ac) in 1985 to 3.2
million ha (7.9 million ac) in 1994 on
BLM lands (Knick et al. 2003). The
replacement of sagebrush vegetation
communities with exotic species such
as Russian thistle (Salsola spp.),
halogeton (Halogeton glomeratus) and
medusahead, has resulted in sage-grouse
habitat loss (Miller and Eddleman
2000).
Young et al. (1972) found that plant
communities of the Great Basin are
highly susceptible to invasion by alien
plants since native annuals are not
adapted to occupy conditions created by
intensive livestock grazing. Exotic
plants can reduce and eliminate
populations of plants that sage-grouse
use for food and cover. As previously
discussed, frequent fires with short
intervals within sagebrush habitats favor
invasion of cheatgrass, which is
unsuitable as sage-grouse habitat
(Schroeder et al. 1999). Cheatgrass then
shortens the fire interval (from
approximately 30 years down to 5
years), perpetuating its own persistence
and spread, and exacerbating the effects
of fire in remaining sage-grouse habitats
(Connelly et al. 2004). Rehabilitation of
an area to sagebrush after cheatgrass
becomes established is extremely
difficult (Connelly et al. 2004).
Large areas of habitat in the western
distribution of the greater sage-grouse
have already been converted to
cheatgrass (Connelly et al. 2000a).
Exotic plant communities are now
dominant on more than 40 million ha in
the Intermountain West (Mack 1981, as
cited in Miller and Eddleman 2000).
This invasive species also occurs in
lower abundance throughout the entire
range of the sage-grouse. Connelly et al.
(2004) estimated the risk of cheatgrass
invasion into sagebrush and other
natural vegetation areas in the western
part of the range of greater sage-grouse
(Southern and Northern Great Basin,
part of the Columbia Basin, and most of
the Snake River Plain), where cheatgrass
currently is concentrated. Based on
elevation, landform, and south-facing
slope parameters, Connelly et al. (2004)
projected that 80 percent of this land
area is susceptible to displacement by
cheatgrass and that in 65 percent of this
area cheatgrass is either already present
or will be within 30 years. Wyomingbasin big sagebrush and salt desert
scrub, which occupy over 40 percent of
the Great Basin, are the cover types most
susceptible to cheatgrass displacement
(Connelly et al. 2004).
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We could not find any studies that
document or attempted to document a
direct relationship between cheatgrass
expansion and sage-grouse population
declines. Yet the available evidence is
clear that cheatgrass has invaded
extensive areas in western parts of
greater sage-grouse range, supplanting
sagebrush plants upon which sagegrouse depend. Although there is a lack
of evidence documenting that cheatgrass
invasion causes sage-grouse declines,
Connelly et al. (2000a) indicated that
some sage-grouse populations have been
affected and some will decline due to
projected, continuing spread of
cheatgrass domination in the absence of
effective management.
Invasive species was ranked as the
primary extinction risk factor for the
greater sage-grouse by the expert panel.
This concern was based on the ability of
invasive species to outcompete
sagebrush, the inability to effectively
control invasives once they become
established, and the ease with which
invasive species are spread through
other factors on the landscape, such as
wildfire and infrastructure construction.
Additionally, one member of the panel
indicated that once invasive species
become established, the ecology of the
system can be changed, resulting in
increased opportunities for other
invasive species to establish, and
subsequently, permanent habitat loss.
Although cheatgrass has been identified
as the primary invasive species resulting
in sagebrush habitat conversion, the
expert panel also cautioned that many
other invasive species (i.e., Japanese
brome and various species of mustards
and knapweeds) may be a greater threat
in the future. The expert panel advised
that based on current knowledge,
prevention is the only effective tool to
preclude large-scale habitat loss from
invasive species in the future. However,
they did not believe that the current rate
of invasive species spread was sufficient
to result in the complete loss of
sagebrush, and therefore the extinction
of sage grouse within the reasonably
foreseeable future.
Pinyon-juniper
There has been an unprecedented
expansion of pinyon-juniper
woodlands, a native habitat type
dominated by pinyon pine (Pinus
edulis) and various juniper species
(Juniperus spp.), with an estimated 10fold increase in the Intermountain West
since European immigrant settlement
(Miller and Tausch 2001). The
expansion of pinyon-juniper forests has
resulted in the loss of many bunchgrass
and sagebrush-bunchgrass communities
that formerly dominated the
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Intermountain West (Miller and Tausch
2001). The major factor cited for the
increase in the pinyon-juniper forest
type is a decrease in fire return intervals
(Miller and Tausch 2001). Other factors
facilitating the increase include
historical livestock grazing patterns,
which reduced the buildup of fine fuels
that more readily carry fire, and
possibly increases in global carbon
dioxide concentrations and climate
change (Miller and Rose 1999, Miller
and Tausch 2001).
Connelly et al. (2004) estimated the
risk of pinyon-juniper displacement of
sagebrush for a large portion of the Great
Basin, based on site elevation, proximity
to extant pinyon-juniper, precipitation,
and topography. Using these
parameters, Connelly et al. (2004)
projected the risk that sagebrush
habitats would be displaced by pinyonjuniper within the next 30 years. They
found that about 60 percent of
sagebrush in the Great Basin was at low
risk of being displaced by pinyonjuniper, 6 percent of sagebrush is at
moderate risk, and 35 percent of
sagebrush habitats are at high risk of
displacement (Connelly et al. 2004).
Connelly et al. (2004) also found that
mountain big sagebrush appears to be
the sagebrush type most at risk for
pinyon-juniper displacement. When
juniper increases in mountain big
sagebrush communities, shrub cover
declines and the season of available
succulent forbs is shortened due to soil
moisture depletion (Crawford et al.
2004). Connelly et al. (2004) caution
that additional field research is needed
to support their estimates.
Pinyon-juniper expansion into
sagebrush habitats, with subsequent
replacement of sagebrush shrub
communities by woodland has been
documented (Miller et al. 1999, Miller
and Tausch 2001, Crawford et al. 2004,
Connelly et al. 2004). It is likely that
further losses of sagebrush habitat due
to pinyon-juniper expansion will occur
within the western part of greater sagegrouse range, especially the southern
Great Basin. We could find no
documentation, however, that pinyonjuniper expansion is a factor affecting
sage-grouse habitat persistence in the
eastern portion of the range (Wyoming
Basin, Colorado Plateau, and silver
sagebrush areas (Connelly et al. 2004)).
Although we could not locate any
studies that documented the effect of
pinyon-juniper expansion on greater
sage-grouse, Commons et al. (1999)
found that the number of male
Gunnison sage-grouse on leks in
southwest Colorado doubled after
pinyon-juniper removal and mechanical
treatment of mountain sagebrush and
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deciduous brush. Hence we can infer
that some sage-grouse populations have
been affected and some will decline due
to projected increases in the pinyonjuniper type, at least within parts of the
Great Basin. The expert panel
considered pinyon-juniper as an
extinction risk for the greater sagegrouse in the western portion of its
range, but only ranked it as a moderate
risk across the entire species’ range.
Urbanization
Low densities of indigenous peoples
have been present for more than 12,000
years in the historical range of sagegrouse. By 1900, Connelly et al. (2004)
reported that less than 1 person/km2
resided in 51 percent of the 325
counties within their assessment area,
and densities greater than 10 persons/
km occurred in 4 percent of the
counties. By 2000, counties with less
than 1 person/km2 occurred in 31
percent of the 325 counties and
densities greater than 10 persons/km2
occurred in 22 percent of the counties
(Connelly et al. 2004). Today, the
dominant urban areas are located in the
Bear River Valley of Utah, the portion of
Bonneville Basin southeast of the Great
Salt Lake, the Snake River Valley of
southern Idaho, and in the Columbia
River Valley of Washington (Rand
McNally Road Atlas 2003, Connelly et
al. 2004).
Urban development has eliminated
some sage-grouse habitat (Braun 1998).
Interrelated effects from urban/suburban
development include construction of
associated infrastructure (roads,
powerlines, and pipelines) and
predation threats from the introduction
of domestic pets and increases in
predators subsidized by human
activities (e.g., landfills). More recent
urban expansion into rural subdivisions
is also resulting in direct habitat loss
and conversion, as well as alteration of
remaining sage-grouse habitats around
these areas due to the presence of
humans and pets (Braun 1998; Connelly
et al. 2000a). In some Colorado counties,
up to 50 percent of sage-grouse habitat
is under rural subdivision development,
and it is estimated that 3 to 5 percent
of all sage-grouse historical habitat in
Colorado has already been converted
into urban areas (Braun 1998). We are
unaware of similar estimates for other
States within the range of the greater
sage-grouse, and therefore cannot
determine the effects of this factor on a
rangewide basis.
Municipal solid waste landfills
(landfills) have been shown to
contribute to increases in common
raven populations (Knight et al. 1993,
Restani et al. 2001, Webb et al. 2004).
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Ravens are known to prey on sagegrouse and have been considered a
restraint on sage-grouse population
growth in some locations (Batterson and
Morse 1948, Autenrieth 1981, Altstatt
1995). Landfills are found in every State
and a number of these are located
within or adjacent to sage-grouse
habitat. However, no studies could be
found that linked landfill presence,
common raven populations, and sagegrouse population levels. Urbanization
was considered as a moderate extinction
risk for the greater sage-grouse by the
expert panel, primarily as a result of
habitat loss and fragmentation from
increasing resource needs to support
expanding human populations.
Summary of Factor A
Loss of sagebrush and greater sagegrouse habitat has been occurring since
arrival of European settlers in the 1800s,
as evidenced by the change in the sagegrouse’s distribution and loss of local
populations (Schroeder et al. 2004).
Habitat loss and fragmentation
continues today as a result of the many
factors described in the preceding
paragraphs. When the expert panel was
asked to identify and rank extinction
risk factors for the greater sage-grouse,
the threats ranked highest in importance
were, in order: invasive species,
infrastructure as related to energy
development and urbanization, wildfire,
agriculture, grazing, energy
development, urbanization, strip/coal
mining, weather, and pinyon-juniper
expansion. However, the majority of the
expert panel did not believe that these
threats were occurring at such a rate to
cause the extinction of the greater sagegrouse within the next 60 to 100 years.
Other threats (e.g., disease and
predation, hard-rock mining, hunting,
contaminants) were considered by the
expert panel to be of lesser importance
to the sage-grouse. Several experts
identified concerns with the synergistic
effects of threat factors (e.g.,
infrastructure increases and invasive
species expansion). The expert panelists
also discussed that the range of the
greater sage-grouse would likely
contract and fragment due to habitat
modifications and losses.
Based on the information gathered
through the scientific literature,
industry, public comments and State
and Federal agencies, as well as the
opinions of the expert panel, Service
biologists determined that the principal
habitat-related threats are not
proceeding at a rate that will threaten
the continued existence of the species
within the foreseeable future. In
addition, the wide distribution of the
species, presence of large ‘‘core’’
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populations, recent population trends in
some areas throughout the species range
(indicating that populations are stable
and/or increasing), and large blocks of
sagebrush habitat are all factors that
contributed to the determination that
the greater sage-grouse is not in danger
of extinction within the foreseeable
future. Thus, based on the best available
scientific and commercial data, we have
concluded that present or threatened
destruction, modification, or
curtailment of the sage-grouse’s habitat
or range is not a factor that threatens or
endangers the species over all or a
significant portion of its range. In
reaching this conclusion, we did
identify that continued efforts to
conserve sagebrush ecosystems and
address habitat threats are important to
long-term persistence of the greater
sage-grouse.
B. Overutilization for Commercial,
Recreational, Scientific, or Educational
Purposes
Presently, there is no commercial
trade in greater sage-grouse, and under
State and Federal laws the sale of sagegrouse meat, feathers and body parts is
illegal. Historically, the greater sagegrouse was heavily exploited by
commercial and sport hunting in the
late 1800s and early 1900s (Patterson
1952; Autenrieth 1981). Hornaday
(1916) and others alerted the public to
the risk of extinction to the species as
a result of this overharvest. In response,
many States closed sage-grouse hunting
seasons by the 1930s (Patterson 1952,
Autenrieth 1981). The impacts of
hunting on greater sage-grouse during
those historical decades may have been
exacerbated by impacts from human
expansion into sagebrush-steppe
habitats (Girard 1937). With the increase
of sage-grouse populations by the 1950s,
limited hunting seasons were again
allowed in most portions of the species
range (Patterson 1952, Autenrieth 1981).
Hunting
Greater sage-grouse are currently
legally sport-hunted in 10 of 11 States
where they occur (Connelly et al. 2004),
and hunting is regulated by State
wildlife agencies. The hunting season
for sage-grouse in Washington was
closed in 1988 (Stinson et al. 2004). In
Canada sage-grouse hunting is not
allowed (Connelly et al. 2004). Most
State agencies base their hunting
regulations on local population
information and peer-reviewed
scientific literature regarding the
impacts of hunting on greater sagegrouse (Bohne in litt., Wyoming Game
and Fish Department, 2003 ). Hunting
seasons are reviewed annually, and
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States change harvest management
based on harvest and population data
(Bohne in litt, Wyoming Game and Fish
Department, 2003). For example,
Wyoming delayed their season to allow
for more equitable distribution of
hunting mortality across all age and sex
classes, thereby reducing female
mortality as compared to previous
seasons (Bohne in litt., Wyoming Game
and Fish Department, 2003).
Relatively few studies have addressed
the effect of recreational hunting on
sage-grouse populations. These studies
suggest that hunting may be
compensatory (i.e., mortality that
replaces deaths that would have
happened otherwise due to other causes
such as predation, or mortality that is
compensated by increased productivity;
Crawford 1982), have no measurable
effect on spring sage-grouse densities
(Braun and Beck 1996), or may be
additive (i.e., mortality that adds more
deaths per year to the total otherwise
attributable to other causes, and is not
compensated by increased productivity;
Zunino 1989, Connelly et al. 2000a).
Johnson and Braun (1999) concluded
that harvest mortality may be additive
for the species if brood hens and young
birds sustain the highest hunting
mortality within a population. No
studies have demonstrated that
regulated hunting is a primary cause of
widespread reduced numbers of greater
sage-grouse (Connelly et al. 2004).
Hunting seasons that are managed so
as to evenly distribute mortality across
all age and sex classes are less likely to
negatively affect subsequent breeding
populations (Braun 1998). Connelly et
al. (2000a) state that most greater sagegrouse populations can sustain hunting
if the seasons are carefully regulated to
keep total mortality within sustainable
levels—but do not evaluate the extent to
which such careful regulation has been
successfully implemented. A maximum
sustainable harvest rate has not been
determined for greater sage-grouse
populations (Connelly et al. 2004). All
States with hunting seasons have
changed limits and season dates to more
evenly distribute hunting mortality
across the entire population structure by
harvesting birds after females have left
their broods (Bohne in litt., Wyoming
Game and Fish Department, 2003). Total
annual gun harvest of sage-grouse across
the 10 western States that have seasons
was approximately 24,000 birds in 2003
(Connelly et al. 2004). We could not
locate any data to assess how those
changes correlate with population
trends.
All 10 States that allow gun hunting
of sage-grouse also allow falconers to
hunt sage-grouse, although no falconers
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are currently hunting sage-grouse in
South and North Dakota (John Wrede,
South Dakota Game, Fish and Parks,
pers. comm. 2004; Gerald Kobriger,
North Dakota Game and Fish Dept.,
pers. comm. 2004). Montana (Rick
Northrup, Montana Dept. Fish, Wildl.
Parks, pers. comm. 2004), Oregon (Dave
Budeau, Oregon Dept. Fish and
Wildlife, pers. comm. 2004), and Idaho
(Tom Hemker, Idaho Dept. Fish and
Game, pers. comm. 2004) indicated that
they do not have data on the level of
harvest through falconry, but believe
such harvest is low due to the few
numbers of falconers and their
dispersed activities. Wyoming reported
a take of 63 sage-grouse by falconers. We
are not aware of any studies that
demonstrate that falconry take of greater
sage-grouse influences population
trends.
We surveyed the State fish and
wildlife agencies within the range of
greater sage-grouse to determine what
information they had on illegal harvest
(poaching) of the species. Two states,
South Dakota and North Dakota
indicated that they had no known
incidents of poaching (John Wrede,
South Dakota Game, Fish and Parks,
pers. comm. 2004; Gerald Kobriger,
North Dakota Game and Fish Dept.,
pers. comm. 2004). None of the
remaining States had any quantitative
data on the level of poaching in their
States. Based on these results, illegal
harvest of greater sage-grouse poaching
appears to occur at low levels. We are
not aware of any studies or other data
that demonstrate that poaching has
contributed to sage-grouse population
declines.
Religious, Scientific, and Recreational
Use
Some Native American tribes harvest
sage-grouse as part of their religious or
ceremonial practices. In Wyoming,
Native American hunting occurs on the
Wind River Indian Reservation, with
about 20 males per year taken off of leks
in the spring (Tom Christiansen,
Wyoming Game and Fish Dept., pers
comm. 2004), and a harvest of 30 males
in the fall (U.S. Fish and Wildlife
Service, in litt. 2004). No harvest by
Native Americans for religious or
ceremonial purposes occurs in South
Dakota, North Dakota, Colorado,
Washington, or Oregon (John Wrede,
South Dakota Game, Fish and Parks
affiliation pers. comm. 2004; Gerald
Kobriger North Dakota Game and Fish
Dept., pers. comm. 2004; Anthony Apa,
Colorado Div. Wildl., pers. comm. 2004;
Michael Schroeder, Washington Dept.
Fish and Wildlife, pers. comm. 2004;
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and Dave Budeau, Oregon Dept. Wildl.,
pers. comm. 2004).
Greater sage-grouse are the subject of
many scientific research studies and
some of these field studies include the
capture and handling of the species. Of
the 11 western States where sage-grouse
occur, all except South Dakota and
North Dakota (John Wrede, South
Dakota Game, Fish and Parks, pers.
comm. 2004; Gerald Kobriger, North
Dakota Game and Fish Dept., pers.
comm. 2004) reported some type of field
studies on sage-grouse between 1999 to
2004 that included the capture,
handling, and subsequent banding, or
banding and radio-tagging of sagegrouse. For these 9 States, 2,491 birds
were captured and processed over six
years, of which 68 birds (about 2.7
percent of handled birds) died due to
capture, handling, or radio-tagging
processes. We are not aware of any
studies that document that this level of
taking has affected any sage-grouse
population trends.
Greater sage-grouse have been
translocated in several States and the
Province of British Columbia (Reese and
Connelly 1997). Reese and Connelly
(1997) documented the translocation of
over 7,200 birds between 1933 and
1990, and additional translocation
efforts have taken place since 1990.
Only 5 percent of the translocation
efforts documented by Reese and
Connelly (1997) were considered to be
successful in producing sustained,
resident populations at the translocation
sites. In 2004 the State of Nevada
supplied the State of Washington with
greater sage-grouse to increase the
genetic diversity of geographically
isolated populations. No information is
available at this time regarding the
success or effectiveness of this
translocation. Given the low numbers of
birds that have been used for
translocation spread over many decades
it is unlikely that the removals from
source populations have contributed to
greater sage-grouse declines, while the
limited success of translocations has
also likely had nominal impact on
rangewide population trends.
Greater sage-grouse are also subject to
a variety of non-consumptive uses such
as bird watching or tour groups visiting
leks, general wildlife viewing, and
photography. Daily human disturbances
on sage-grouse leks could cause a
reduction in mating, and some
reduction in total production (Call and
Maser 1985). Only a few leks in each
state receive regular viewing use
visitation by humans during the
strutting season, and most States report
no known impacts from this use (John
Wrede, South Dakota Game, Fish and
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Parks, pers. comm. 2004; Rick Northrup,
Montana Dept. Fish, Wildl. Parks, pers.
comm. 2004; Tom Christiansen,
Wyoming Game and Fish Dept., pers.
comm. 2004; Tom Hemker, Idaho Dept.
Fish and Game, pers. comm. 2004).
Only Colorado had data regarding the
effects of non-consumptive use, which
suggested that controlled lek visitation
has not impacted sage-grouse (Anthony
Apa, Colorado Div. Wildl., pers. comm.
2004). State agencies in Oregon, Nevada,
and North Dakota report that there is
potential for impacts at individual leks
that are the most heavily used for
viewing (Dave Budeau, Oregon Dept.
Wildl., pers. comm. 2004; Shawn
Espinosa, Nevada Divison of Wildl.,
pers. comm., 2004; Gerald Kobriger
North Dakota Game and Fish Dept.,
pers. comm. 2004). The BLM has
reported movement of a sage-grouse lek,
and decreasing male numbers on the
same lek apparently in response to lek
viewing at that location (Jan Hanf, BLM,
pers. comm. 2004). We were not able to
locate any studies documenting how lek
viewing, or other forms of nonconsumptive recreational uses, of sagegrouse are related to sage-grouse
population trends and we have no
indication that they are contributing to
declining trends.
Summary of Factor B
The expert panel did not identify
hunting as a primary threat factor for the
greater sage-grouse. In their discussion
of extrinsic threat factors, the expert
panel identified that hunting occurs
within a limited timeframe and at a time
of the year when productivity is
unlikely to be affected significantly. In
addition, they noted that hunting is a
regulated management technique that
can be quickly adjusted to changing
conditions. No data were collected
suggesting that poaching, nonconsumptive use, or scientific use limit
greater sage-grouse populations
rangewide. Based on the best scientific
and commercial data available,
including input from the expert panel,
we have concluded that overutilization
for commercial, recreational, scientific,
or educational purposes is not a factor
that endangers or threatens the sagegrouse throughout all or a significant
portion of its range.
C. Disease or Predation
Disease
There have been few systematic
surveys for parasites or infectious
diseases of the greater sage-grouse, and
therefore, their role in population
declines is unknown for this species
(Connelly et al. 2004). Some early
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studies have suggested that sage-grouse
populations are adversely affected by
parasitic infections (Batterson and
Morse 1948). Parasites have also been
implicated in sage-grouse mate
selection, with potentially subsequent
effects on the genetic diversity of this
species (Boyce 1990; Deibert 1995), but
Connelly et al. (2004) note that while
these relationships may be important to
the long-term ecology of greater sagegrouse, they have not been shown to be
significant to the immediate status of
populations. Connelly et al. (2004) have
suggested that diseases and parasites
may limit isolated sage-grouse
populations. The potential effects of
emerging diseases require additional
study.
Sage-grouse are hosts to many
parasites (Connelly et al. 2004; Thorne
et al. 1982). Only the protozoan, Eimeria
spp., which causes coccidiosis
(Connelly et al. 2004), has proven to be
fatal, but mortality is not 100 percent,
and young birds that survive an initial
infection typically do not succumb to
subsequent infections (Thorne et al.
1982). Infections tend to be localized to
specific geographic areas. Most cases of
coccidiosis in greater sage-grouse have
been found where large numbers of
birds congregated, resulting in soil and
water contamination by fecal material
(Connelly et al. 2004). While the role of
this parasite in population changes is
unknown, Petersen (2004) hypothesized
that coccidiosis could be limiting for
local populations, as this parasite causes
decreased growth and significant
mortality in young birds, thereby
potentially limiting recruitment.
However, no cases of sage-grouse
mortality resulting from coccidiosis
have been documented since the early
1960s (Connelly et al. 2004).
Other parasites which have been
documented in the greater sage-grouse
include, Sarcosystis ssp (another form of
coccidea), blood parasites (including
avian malaria, Leucocytozoon spp.,
Haemoproteus spp., and Trypanosoma
avium), Tritrichomonas simoni,
tapeworms, gizzard worms (Habronema
spp. and Acuaria spp.), cecal worms,
and filarid nematodes (Thorne et al.
1982; Connelly et al. 2004; Petersen
2004). None of these parasites have been
known to cause mortality in the greater
sage-grouse. Sub-lethal effects of these
parasitic infection on sage-grouse have
never been studied.
Greater sage-grouse host many
external parasites, including lice, ticks,
and dipterans (midges, flies,
mosquitoes, and keds) (Connelly et al.
2004). Most ectoparasites do not
produce disease, but can serve as
disease vectors or cause mechanical
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injury and irritation (Thorne et al.
1982). Many biologists contend that
ectoparasites can be detrimental to their
hosts, particularly when the bird is
stressed by inadequate habitat or
nutritional conditions (Petersen 2004).
Some studies have suggested that lice
infestations can affect sage-grouse mate
selection (Boyce 1990; Spurrier et al.
1991; Deibert 1995), but population
impacts are not known (Connelly et al.
2004).
Greater sage-grouse are also subject to
a variety of bacterial, fungal, and viral
pathogens. The bacteria Salmonella
spp., has caused mortality in the greater
sage-grouse; the bacteria apparently
contracted through of exposure to
contaminated water supplies around
livestock stock tanks (Connelly et al.
2004). Other bacteria found in sagegrouse include Escherichia coli,
botulism (Clostridium spp.), avian
tuberculosis (Mycobacterium avium),
and avian cholera (Pasteurella
multocida). These bacteria have never
been identified as a cause of mortality
in greater sage-grouse and the risk of
exposure and hence, population effects,
is low (Connelly et al. 2004). One case
of aspergillosis, a fungal disease, has
been documented in sage-grouse, but
there is no evidence to suggest this
fungus plays a role in limiting greater
sage-grouse populations (Connelly et al.
2004; Petersen 2004).
Viral diseases could cause serious
diseases in grouse species and
potentially influence population
dynamics (Petersen 2004). However,
prior to 2003 only avian infectious
bronchitis (caused by a coronavirus) had
been identified in the greater sagegrouse. No clinical signs of the disease
were observed.
West Nile virus (WNv; Flavivirus) was
introduced into the northeastern United
States in 1999 and has subsequently
spread across North America (Marra et
al. 2004). This virus was first diagnosed
in greater sage-grouse in 2003, and has
been shown to affect sage-grouse
survival rates. Data from four studies in
the eastern half of the sage-grouse range
(Alberta, Montana, Wyoming) showed
survival in these populations declined
25 percent in July and August as a result
of the WNv infection (Naugle et al.
2004). Populations of grouse that were
not affected by WNv showed no similar
decline. Additionally, individual sagegrouse in exposed populations were 3.4
times more likely to die during July and
August, the ‘‘peak’’ of WNv occurrence,
than birds in non-exposed populations
(Connelly et al. 2004; Naugle et al.
2004). Subsequent declines in both male
and female lek attendance in infected
areas in 2004 compared with years
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before WNv was detected in this area
suggest outbreaks could contribute to
local population extirpation (Walker et
al. 2004). Lek surveys in 2004, however,
indicated that regional sage-grouse
populations did not decline, suggesting
that the initial effects of WNv were
localized (Oedokoven, unpublished
data, 2004). Five sage-grouse deaths
resulting from WNv have been
identified in 2004, four from the Powder
River Basin area of northeastern
Wyoming and southeastern Montana
(Dave Naugle, U. Montana, pers. comm.
2004), and one from the northwestern
Colorado, near the town of Yampa
(Anthony Apa, Colorado Division of
Wildlife, pers. comm. 2004). An
additional three sage-grouse deaths in
California from WNv were reported in
2004 (Scott Gardner, Ca. Dept. Fish
Game, pers. comm. 2004). In 2004, WNv
was detected in a variety of species in
western Colorado, Utah, Idaho, Nevada,
California and Oregon (U.S. Geological
Service, National Wildlife Health
Laboratory, 2004). Outside of the
Powder River Basin of Wyoming and
Montana, California and western
Colorado, we are unaware of
comprehensive efforts to track sagegrouse mortalities. Therefore, the actual
distribution and extent of WNv in sagegrouse in 2004 is unknown.
Greater than 300 serum samples taken
from live-captured wild grouse in
known WNv infected areas were
negative for WNv antibodies, indicating
that these animals had not been exposed
to the virus (Todd Cornish, U.
Wyoming, pers. comm. 2004). The lack
of birds with antibodies suggests that
sage-grouse do not survive a WNv
infection because if any were surviving,
at least some of the birds sampled from
the exposed areas should be survivors
with antibodies (Connelly et al. 2004;
Oedekoven 2004). All 25 wild sagegrouse brought into a controlled
research laboratory and inoculated with
various doses of WNv, including doses
thought to be less than the amount that
would be delivered by a typical
mosquito bite, perished within 8 days of
infection (Todd Cornish, U. of
Wyoming, unpublished data, 2004). In
addition, direct exposure of noninfected sage-grouse to infected sagegrouse under laboratory conditions also
resulted in 40 percent mortality of 6
individuals, in the absence of the
mosquito vector for WNv (Culex
tarsalis) (Todd Cornish, U. of Wyoming,
unpublished data, 2004). These
experimental results, combined with
field data, suggest that a widespread
WNv infection could negatively impact
greater sage-grouse.
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Late-summer habitat requirements of
sage-grouse potentially increase their
exposure to WNv. Sage-grouse hens and
broods congregate in mesic habitats in
the mid- to late summer, thereby placing
them in the same potential habitats as
the WNv mosquito vector when the
mosquitoes are likely to be active.
Surface water sources that have been
created for agricultural, livestock, and
oil and gas activities may increase the
contact between sage-grouse and the
mosquito vector (Naugle et al. 2004;
Connelly et al. 2004; Walker et al. 2004).
Losses from WNv come at a time of year
when survival is otherwise typically
high for adult females (Schroeder et al.
1999; Connelly et al. 2000a; Aldridge
and Brigham 2003), thus potentially
making these WNv deaths additive to
other mortality sources and reducing
average annual survival.
Predation
Predation is the most commonly
identified cause of direct mortality for
sage-grouse (Schroeder et al. 1999,
Connelly et al. 2000b). Greater sagegrouse have many predators, which vary
in relative importance depending on the
sex and age of the bird and the time of
year. Predators of adult greater sagegrouse include coyotes (Canis latrans),
bobcats (Lynx rufus), weasels (Mustela
spp.), golden eagles (Aquila chrysaetos),
red-tailed hawks (Buteo jamaicensis),
Swainson’s hawks (B. swainsoni), and
ferruginous hawks (B. regalis) (Hartzler
1974, Schroeder et al. 1999, Rowland
and Wisdom 2002, Schroeder and
Baydack 2001). In the Strawberry Valley
of Utah, Bambrough et al. (2000) noted
that low survival of greater sage-grouse
may have been due to an unusually high
density of red foxes.
Adult male greater sage-grouse are
most susceptible to predation during the
mating season as they are very
conspicuous while performing their
mating display. And, because leks are
attended daily, predators may be
attracted to these areas during the
breeding season (Braun in litt. 1995).
However, given the greater sage-grouse’s
breeding system, where only a few
males are selected by all the females for
mating, loss of some adult males on the
lek is not likely to have significant
population effects (Braun in litt. 1995).
Adult female greater sage-grouse are
most susceptible to predators while on
the nest or during brood-rearing when
they are with young chicks (Schroeder
and Baydack 2001). Autenrieth (1981),
referencing annual predator losses,
concluded that predation of eggs was
the most important population
constraint in Idaho at that time.
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Juvenile grouse are susceptible to
predation from badgers, red foxes,
coyotes, weasels, American kestrels
(Falco sparverius), merlins (F.
columbarius), northern harriers (Circus
cyaneus), and other hawks (Braun in
litt. 1995; Schroeder et al. 1999). Gregg
et al. (2003a, 2003b) found that chick
predation mortality ranged from 27
percent to 51 percent in 2002 and 10
percent to 43 percent in 2003 on three
study sites in Oregon. The juvenile
mortality rate, during the first few
weeks after hatching, was estimated to
be 63 percent (Wallestad 1975 in
Schroeder and Baydack 2001). While
chicks are very vulnerable to predation
during this period, other causes of
mortality, such as weather, are included
in this estimate.
Nesting success is positively
correlated with the presence of big
sagebrush and relatively thick grass and
forb cover (Schroeder and Baydack
2001). Losses of nesting adult hens and
nests appear to be related to the amount
of herbaceous cover surrounding the
nest (Braun in litt. 1995; Braun 1998;
Coggins 1998, Connelly et al. 2000b;
Schroeder and Baydack 2001). DeLong
et al. (1995) found a lower probability
of nest predation at nest sites with tall
grass and medium shrub cover in
Oregon. Removal or reduction of this
cover, by any method, can reduce nest
success and adult hen survival.
Similarly, habitat alteration that reduces
cover for young chicks can increase the
rate of predation on this age class
(Schroeder and Baydack 2001). Losses
of breeding hens and young chicks can
influence overall greater sage-grouse
population numbers, as these two
groups contribute most significantly to
population productivity.
Agricultural development, landscape
fragmentation, and human populations
have the potential to increase predation
pressure by forcing birds to nest in
marginal habitats, by increasing travel
time through habitats where they are
vulnerable to predation, and by
increasing the diversity and density of
predators (Ritchie et al. 1994, Schroeder
and Baydack 2001, Connelly et al. 2004;
Summers et al. 2004). Increasing
populations of predators that
historically were relatively rare in the
sagebrush landscape, and are very
effective nest predators, such as red fox
and corvids (Sovada et al. 1995), have
the potential to increase rates of
predation on sage-grouse. Connelly et
al. (2000a) noted that ranches, farms,
and housing developments have
resulted in the introduction of
nonnative predators including domestic
dogs (Canis domesticus) and cats (Felis
domesticus) into greater sage-grouse
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habitats. Where greater sage-grouse
habitat has been altered in localized
areas, the influx of predators can limit
populations (Gregg et al. 1994; Braun in
litt. 1995; Braun 1998; DeLong et al.
1995; Schroeder and Baydack 2001).
Habitat fragmentation and the resultant
predation increase may be a limiting
factor for the Gunnison sage-grouse
(Oyler-McCance et al. 2001).
Research conducted to determine nest
success and greater sage-grouse survival
has concluded that predation typically
does not limit greater sage-grouse
numbers (Connelly and Braun 1997,
Connelly et al. 2000a, Connelly et al.
2000b, Wambolt et al. 2002). The
conclusion that predation is not
generally a limiting factor is supported
by evidence showing that predator
removal does not have long-lasting
effects on sage-grouse population size or
stability over large regions (Cote and
Sutherland 1997, Schroeder et al. 1999,
Wambolt et al. 2002). For example,
Slater (2003) demonstrated that coyote
control failed to produce an effect on
greater sage-grouse nesting success in
southwestern Wyoming. In their review
of literature regarding predation,
Connelly et al. (2004) noted that only
two of nine studies examining survival
and nest success indicated that
predation had limited a sage-grouse
population by decreasing nest success.
However, both studies indicated low
nest success due to predation was
ultimately related to poor nesting
habitat. Connelly et al. (2004) further
noted that the idea that predation is not
a widespread factor depressing sagegrouse populations is supported by
studies of nest success rates (which
indicate nest predation is not a
widespread problem), by the relatively
high survival of adult birds, and by the
lack of an effect on nesting success as
a result of coyote control in Wyoming.
Summary of Factor C
The expert panel did not identify
disease or predation as primary
extinction risk factors for the greater
sage-grouse. The experts expressed
concerns about the potential effects of
future WNv outbreaks, but were unable
to draw any definitive conclusions
about extinction risk to sage-grouse
posed by this disease because
insufficient information is available to
do so. Connelly et al. (2004) noted that
prior to the recent emergence of WNv
there was little evidence to suggest that
pathogens or parasites were major
threats to the greater sage-grouse.
Although we have relatively poor
understanding of the actual effects of
disease or parasites on sage-grouse
populations, since systematic surveys
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have never been conducted, we
continue to be concerned about the
potential effects of WNv on greater sagegrouse. We will closely monitor future
infections and observed population
effects to the greater sage-grouse.
Predation has also not been identified as
a limiting factor to sage-grouse
populations, except in areas of habitat
degradation and loss. Thus, based on
the best scientific and commercial data
available, we have concluded that
disease and predation are not factors
that endanger or threaten the sagegrouse throughout all or a significant
portion of its range at this time.
D. The Inadequacy of Existing
Regulatory Mechanisms
Local Laws and Regulations
Approximately 27 percent of the
sagebrush land in the United States is
privately owned (Connelly et al. 2004).
We are not aware of any county or city
ordinances that provide protection
specifically for the greater sage-grouse
or their habitats on private land,
although we recognize that such
ordinances could be proposed as rural
governments and local sage-grouse
working groups investigate strategies to
protect sage-grouse on private lands. We
recognize that county or city ordinances
that address agricultural lands,
transportation, and zoning for various
types of land uses have the potential to
influence sage-grouse (e.g., zoning that
protects open space can retain suitable
sage-grouse habitat, and zoning that
allows a housing development and
associated roads can result in
destruction and/or fragmentation of
habitat occupied by sage-grouse during
some part of their life cycle). However,
we have no detailed information
regarding the nature or extent of zoning
efforts within the species range and its
direct or indirect effects on populations
and habitats.
State Laws and Regulations
In the United States, greater sagegrouse are managed by State wildlife
agencies on all lands within the State as
resident native game birds (Connelly et
al. 2004), except in Washington, where
the bird was listed as a State-threatened
species in 1998 and they are managed
as a State-listed threatened species
(Stinson et al. 2004). The classification
as a resident game bird (with the
exception of Washington) allows the
direct human taking of the bird during
hunting seasons authorized and
conducted under State laws and
regulations. Currently, harvest of greater
sage-grouse is authorized by 10 of the 11
western States where they occur
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(Connelly et al. 2004). Sage-grouse
hunting is prohibited is Washington,
where the season has been closed since
1988 (Stinson et al. 2004).
Each State agency bases its hunting
regulations on local population
information and peer-reviewed
scientific literature regarding the
impacts of hunting on the greater sagegrouse (Bohne in litt., Wyoming Game
and Fish Department 2003). Hunting
seasons are reviewed annually by each
State, and they implement adaptive
management based on harvest and
population data (U.S. Fish and Wildlife
Service 2004; 69 FR 21484; Montana
Sage Grouse Work Group (MSGWG)
2004).
State agencies directly manage 5
percent of the total landscape
dominated by sagebrush in the United
States and various State laws and
regulations identify the need to
conserve wildlife habitat (Connelly et
al. 2004). As an example, in Colorado,
‘‘wildlife and their environment’’ are to
be protected, preserved, enhanced and
managed (Colorado Revised Statutes,
Title 33, Article 1–101 in Connelly et al.
2004). Laws and regulations in Oregon,
South Dakota, and California have
similar provisions, and allow for
acquisition of funding to acquire and
conserve wildlife habitat (Connelly et
al. 2004). Some States also have the
legal authority to make land purchases
and/or to enter into easements with
landowners regarding wildlife habitats.
For example, Montana Fish Wildlife and
Parks (MTFWP) has authority to acquire
easements or purchase land directly to
protect wildlife habitat (MSGWG 2004).
The Washington Department of Fish and
Wildlife (WADFW) has designated sagegrouse habitat as a ‘‘priority habitat’’
which identifies this habitat as a
priority for conservation and
management, and provides species and
habitat information to interested parties
for land use planning purposes (Stinson
et al. 2004). However, the
recommendations provided under this
program are guidelines, not regulations;
thus, their use is not required.
Alternatively, some States have laws
that directly address the management of
certain State lands and require that it be
based on maximizing financial returns.
For example, under a provision of the
State Constitution (Article IX-Section 8),
the Idaho Department of Lands (IDL) is
directed to manage approximately 2.4
million acres of state endowment lands
‘‘in such a manner as to secure the
maximum long-term financial return to
the beneficiary institution to which
granted.’’ The IDL can take measures
that protect or enhance wildlife habitat
subject to their fundamental
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requirement to secure maximum longterm financial returns (Idaho Dept. Fish
and Game in litt. 2004). The Montana
Department of Natural Resources and
Conservation (MTDNRC) is responsible
for managing approximately 5.1 million
surface acres and 6.3 million acres of
subsurface trust land distributed across
the State (MSGWG 2004). Under State
law, proceeds from the sale and
management of this trust land are used
to support and maintain public schools
and various State institutions. The
obligation for management and
administration of these trust lands is to
obtain the greatest benefit for the school
trusts, and the monetary return must be
weighed against the long-term
productivity of the land to ensure
continued future returns to the trusts
(MSGWG 2004). State lands which are
managed to enhance economic returns
for the benefit of education trust funds
may or may not include benefits for
wildlife habitat. The Service does not
have complete information pertaining to
all State laws and regulations that
directly or indirectly relate to greater
sage-grouse habitat on these lands.
All States within the extant range of
the greater sage-grouse have, or are
developing, conservation plans for the
species and its habitats. These efforts
are in addition to current research and
monitoring efforts for the greater sagegrouse conducted by State agencies. The
conservation plans are focused on
addressing local sage-grouse or
sagebrush habitat concerns through a
variety of mechanisms (i.e., changes in
regulations, habitat improvement
projects, etc.). These plans are in
various stages of development, and
many have not yet begun
implementation of actual habitat
conservation practices. As previously
stated, 20 of approximately 300
individual efforts contained within the
27 plans we received met the standard
in PECE (see 68 FR 15115) for having
sufficient certainty of implementation
and effectiveness (see the ‘‘Status
Review Process’’ section, above, for
further details regarding PECE). Of these
20 efforts, 15 involved state wildlife
agencies (the other 5 involved the BLM
or Forest Service). The members of the
expert panel were provided with
information regarding these 20 projects,
and were given the opportunity to reevaluate their projections of extinction
risk to the greater sage-grouse on a
rangewide basis considering these. Only
one panelist determined that these
cumulative efforts would reduce the risk
of extinction to the species. All the
panelists agreed that local conservation
efforts are necessary to the long-term
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conservation of the species, but the
existing plans were too early in
development and implementation to
influence their opinion at this time.
United States Federal Laws and
Regulations
The greater sage-grouse is not covered
or managed under the provisions of the
Migratory Bird Treaty Act (16 U.S.C.
703–712). Federal agencies in the
United States are responsible for
managing 66 percent of the sagebrush
landscape (Connelly et al. 2004). The
Federal agencies with the most
sagebrush are the Bureau of Land
Management (BLM), an agency of the
Department of the Interior, and the U. S.
Forest Service (USFS), an agency of the
Department of Agriculture. The U.S.
Department of Defense, U.S. Department
of Energy, and several agencies in the
Department of the Interior also have
responsibility for lands and/or decisions
that involve habitat of the greater sagegrouse.
The BLM estimates that about 46
percent of greater sage-grouse habitat is
on BLM-administered land, with
approximately 78.3 million acres of
BLM-administered lands falling within
the range currently occupied by the
greater sage-grouse (BLM 2004a). The
Federal Land Policy and Management
Act of 1976 (FLPMA) (43 U.S.C. 1701 et
seq.) is the primary federal law
governing most land uses on BLMadministered lands. Section 102(a)(8) of
FLPMA specifically recognizes wildlife
and fish resources as being among the
uses for which these lands are to be
managed: ‘‘The Congress declares it is
the policy of the United States that the
public lands be managed in a manner
that * * * will provide food and habitat
for fish and wildlife and domestic
animals. * * *’’ Regulations pursuant
to FLPMA and the Mineral Leasing Act
(30 U.S.C. 181 et seq.) that address
wildlife habitat protection on BLMadministered land include 43 CFR
3162.3–1 and 43 CFR 3162.5–1; 43 CFR
4120 et seq.; 43 CFR 4180 et seq.
BLM policy and guidance for species
of concern occurring on BLM managed
land is addressed under BLM Manual
6840—Special Status Species
Management (BLM 2001). In 1998 the
greater sage-grouse was State-listed as a
threatened species in Washington
(Stinson et al. 2004), and therefore BLM
decisions and actions involving greater
sage-grouse habitat on BLMadministered lands in Washington have
been subject to the policy guidance in
BLM Manual 6840 since then. The BLM
has designated the greater sage-grouse a
sensitive species across all 11 States in
the sage-grouse range. BLM’s policy
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regarding sensitive species is that ‘‘The
protection provided by the policy for
candidate species shall be used as the
minimum level of protection for BLM
sensitive species’’ (BLM 2001). The
BLM policy regarding candidate species
includes: implementation of
management plans for conserving the
species and its habitats; ensuring
actions authorized, funded, or carried
out by the BLM do not contribute to the
need for the species to become listed;
ensuring the species are considered in
land use plans; developing and/or
participating in management plans and
species and habitat assessments; and
monitoring the species for evaluating of
management objectives (BLM 2001).
Land use plans are the basis for all
actions and authorizations involving
BLM-administered lands and resources:
they establish allowable resource uses,
resource condition goals and objectives
to be attained; program constraints and
general management practices needed to
attain the goals and objectives; general
implementation sequences; and
intervals and standards for monitoring
and evaluating the plan to determine its
effectiveness and the need for
amendment or revision (43 CFR 1601.0–
5(k)). According to a draft Report
provided to the Service by BLM, there
are 98 land use plans that involve sagegrouse habitat (BLM 2004a). Based on
information provided by BLM field
offices, 13 of the 98 plans do not contain
any direction that specifically pertains
to the greater sage-grouse or its habitat
(BLM 2004a). The other 85 plans
contain standards and/or prescriptions
that ‘‘contribute positively to on-theground sage-grouse habitat
conservation’’ and/or ‘‘contribute
positively to on-the-ground sagebrush
conservation.’’ Examples include
fencing areas with value to sage-grouse,
and applying distance stipulations
around leks (BLM 2004a). However, the
BLM does not provide or describe the
criteria or process used to determine
that the standards and/or prescriptions
listed in this report contribute positively
to sage-grouse habitat or sagebrush
conservation (BLM 2004a).
Land use plans provide a framework
and programmatic guidance for
implementation (activity) plans, which
are site-specific plans written to
implement decisions made in a land use
plan. Examples include allotment
management plans (AMPs) that address
livestock grazing, oil and gas field
development, travel management, and
wildlife habitat management.
Implementation/activity plan decisions
normally require additional planning
and NEPA analysis. With regard to
special status species, BLM Manual
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6840.22A states: ‘‘Implementation-level
planning should consider all sitespecific methods and procedures which
are needed to bring the species and their
habitats to the condition under which
the provisions of the ESA are not
necessary, current listings under special
status species categories are no longer
necessary, and future listings under
special status species categories would
not be necessary.’’
On November 16, 2004, BLM
Instruction Memorandum (IM) No.
2005–024 transmitted information to all
BLM field and Washington Office
officials regarding the development of a
National BLM Sage-grouse Habitat
Conservation Strategy for BLMadministered lands. This strategy is
described as the framework to address
the conservation of sage-grouse and risk
to sagebrush habitats on lands and
activities administered by the BLM. It
commits the BLM to work with States
and local interests on this issue. The IM
instructed BLM State Directors to
develop a process and schedule to
update deficient land use plans to
adequately address sage-grouse and
sagebrush conservation needs no later
than April 1, 2005. Implementation
plans are also covered by this IM.
BLM has the regulatory authority for
oil and gas leasing, as provided at 43
CFR 3100 et seq., and they are
authorized to require stipulations as a
condition of issuing a lease. Programspecific guidance for fluid minerals
(which include oil and gas) in the BLM
planning handbook specifies that land
use plan decisions will identify
restrictions on areas subject to leasing,
including closures, as well as lease
stipulations (BLM 2000). This handbook
further also specifies that all
stipulations must have waiver,
exception, or modification criteria
documented in the plan, and notes that
the least restrictive constraint to meet
the resource protection objective should
be used (BLM 2000). BLM states that
some ‘‘older’’ oil and gas leases do not
have stipulations that address sagegrouse (BLM 2004a), but we do not have
information on how many of these
leases are in this category. BLM has the
regulatory authority to condition the
application for drill use authorizations,
conducted under a lease, that does not
contain sage-grouse conservation
stipulations (BLM 2004a). Also, some
oil and gas leases have a 200-meter
(0.12-mile) stipulation, which allows
movement of the drilling area by that
distance (BLM 2004a). BLM states that
many of their field offices work with the
operators to move a proposed drilling
site farther or justify such a move
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through the site-specific NEPA process
(BLM 2004a).
In developing stipulations for oil and
gas the BLM considers the best available
scientific information, including, but
not limited to, the sage-grouse
population and habitat management
guidelines developed by the Western
States Sage and Columbian Sharp-tailed
Grouse Technical Committee under the
direction of the Western Association of
Fish and Wildlife Agencies, as
published by Connelly et al. (2000a)
(BLM 2004a). BLM states that a sitespecific evaluation decision is required
to implement conservation measures
given the complexity and variability of
the habitat and other variables (BLM
2004a).
The oil and gas leasing regulations
authorize BLM to modify or waive lease
terms and stipulations if the authorized
officer determines that the factors
leading to inclusion of the term or
stipulation have changed sufficiently to
no longer justify protection, or if
proposed operations would not cause
unacceptable impacts (43 CFR 3101.1–
4). The Service does not have
information on the type or number, or
the basis for, exceptions, modifications,
or waivers of stipulations pertaining to
the greater sage-grouse and/or their
habitat that have been granted by BLM.
The Energy Policy and Conservation
Act (EPCA) of 2000 included provisions
requiring the Secretary of the Interior to
conduct a scientific inventory of all
onshore Federal lands to identify oil
and gas resources underlying these
lands and the nature and extent of any
restrictions or impediments to the
development of such resources (U.S.C.
Title 42, Chapter 77, section 6217(a)).
On May 18, 2001, the President signed
Executive Order 13212—Actions to
Expedite Energy-Related Projects (E.O.
13212) (66 FR 28357, May 22, 2001),
which states that it is the
Administration’s policy that the
executive departments and agencies
shall take appropriate actions, to the
extent consistent with applicable law, to
expedite projects that will increase the
production, transmission, or
conservation of energy. The Executive
Order specifies that this includes
expediting review of permits or taking
other actions as necessary to accelerate
the completion of projects, while
maintaining safety, public health, and
environmental protections. The BLM
has responded to these declarations
with the issuance of several IM to their
staff that may influence sage-grouse
conservation during these actions,
including providing guidance for land
use planning relative to oil and gas
operations and focusing efforts for
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resource recovery in seven areas, six of
which are within occupied greater sagegrouse habitats ((IM 2003–137, April 3,
2003; IM No. 2003–233, July 28, 2003).
As discussed previously, BLM land
use plans and implementation plans
may include BMPs, which are defined
as ‘‘a suite of techniques that guide, or
may be applied to, management actions
to aid in achieving desired outcomes.
IM 2004–194 (June 22, 2004) addresses
the integration of Best Management
Practices (BMPs) into Application for
Permit to Drill (APD) approvals and
associated rights-of-way. This IM states
that BLM Field Offices ‘‘shall
incorporate appropriate BMPs into
proposed APDs and associated on and
off-lease rights-of-way approvals after
appropriate NEPA evaluation. The
wildlife management criteria are
broadly stated. For example, one BMP
is: ‘‘To minimize habitat loss and
fragmentation, re-establish as much
habitat as possible by maximizing the
area reclaimed during well production
operations. In many cases, this
‘‘interim’’ reclamation can cover nearly
the entire site. It is OK to set up well
workover operations or park on the
restored vegetation. Just repair the
damage when you are done.’’ Another
example is: ‘‘Consider drilling multiple
wells from a single well pad to reduce
the footprint of oil and gas activity on
wildlife habitat.’’ The Service has no
information regarding the results of
BLM monitoring and evaluation of the
effectiveness of these or similar BMPs
that may have been adopted previously
in BLM planning documents or as part
of other, more site-specific planning
decisions.
BLM regulatory authority for grazing
management is provided at 43 CFR part
4100 (Regulations on Grazing
Administration Exclusive of Alaska).
Livestock grazing permits and leases
contain terms and conditions
determined by BLM to be appropriate to
achieve management and resource
condition objectives on the public lands
and other lands administered by the
BLM, and to ensure that habitats are, or
are making significant progress toward
being, restored or maintained for BLM
special status species (43 CFR
4180.1(d)). Grazing practices and
activities subject to standards and
guidelines include the development of
grazing related portions of
implementation/activity plans,
establishment of terms and conditions
of permits, leases and other grazing
authorizations, and range improvement
activities such as vegetation
manipulation, fence construction, and
development of water.
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The State or regional standards for
grazing administration must address
habitat for endangered, threatened,
proposed, candidate, or special status
species, and habitat quality for native
plant and animal populations and
communities (43 CFR 4180.2(d)(4) and
(5). The guidelines must address
restoring, maintaining or enhancing
habitats of BLM special status species to
promote their conservation, and
maintaining or promoting the physical
and biological conditions to sustain
native populations and communities (43
CFR 4180.2(e)(9) and (10). BLM is
required to take appropriate action not
later than the start of the next grazing
year upon determining that existing
grazing practices or levels of grazing use
are significant factors in failing to
achieve the standards and conform with
the guidelines (43 CFR 4180.2(c)). BLM
agreed to work with their Resource
Advisory Councils to expand the
rangeland health standards required
under 43 CFR part 4180 so that there are
public land health standards relevant to
all ecosystems, not just rangelands, and
that they apply to all BLM actions, not
just livestock grazing (BLM Manual
4180.06.A). All States within the range
of greater sage-grouse have a resource
advisory council, except Wyoming.
The BLM states that 89 percent of
lands are meeting standards, or are not
meeting standards but appropriate
actions have been implemented to
ensure significant progress towards the
standards (BLM 2004a). The remaining
11 percent are not meeting standards
due to either livestock grazing or other
causes. We have no information on how
these rangeland health categories affect
sage-grouse habitats.
On December 8, 2003, BLM issued a
proposed rule (68 FR 68452) that would
modify the current grazing management
regulation in two ways: (1) It provides
that assessment and monitoring
standards are needed to support a
determination that livestock grazing
significantly contributes to not meeting
a standard or conforming with a
guideline; and (2) It requires BLM to
analyze, formulate and propose
appropriate action within 24 months of
the determination (rather than ‘‘before
the start of the next grazing year’’). This
proposed rule has not been finalized.
The Forest Service (USFS) has
management authority for 8 percent of
the sagebrush habitat in the United
States (Connelly et al. 2004).
Management of Federal activities on
National Forest System lands is guided
principally by the National Forest
Management Act (NFMA) (16 U.S.C.
1600–1614, August 17, 1974, as
amended 1976, 1978, 1980, 1981, 1983,
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1985, 1988 and 1990). NFMA specifies
that all National Forests must have a
land and resource management plan
(LRMP) (16 U.S.C. 1600) to guide and
set standards for all natural resource
management activities on each National
Forest or National Grassland. NFMA
requires the USFS to incorporate
standards and guidelines into LRMPs
(16 U.S.C. 1600). This has historically
been done through a NEPA process,
including provisions to manage plant
and animal communities for diversity,
based on the suitability and capability
of the specific land area in order to meet
overall multiple-use objectives. The
Forest Service planning process is
similar to BLM’s.
The 1982 NFMA implementing
regulation for land and resource
management planning (1982 rule, 36
CFR part 219), under which all existing
forest plans were prepared, requires the
Forest Service to manage habitat to
maintain viable populations of existing
native vertebrate species on National
Forest System lands (1982 rule, 36 CFR
219.19). Management indicator species
were used to estimate the effects of each
alternative on fish and wildlife
populations, and were selected because
their population changes are believed to
reflect the effects of management
activities (1982 rule, 36 CFR 219.19(a)).
The regulation requires that during the
planning process, each alternative
considered needed to establish
objectives for the maintenance and
improvement of habitat for management
indicator species, to the degree
consistent with overall multiple use
objectives of the alternative (1982 rule,
36 CFR 219.19(a)). Fourteen National
Forests identified greater sage-grouse as
a Management Indicator Species,
including Beaverhead National Forest,
Little Missouri National Grassland,
Thunder Basin National Grassland,
Buffalo Gap National Grassland, White
River National Forest, Ashley National
Forest, Boise National Forest, Caribou
National Forest, Curlew National
Grassland, Humboldt National Forest,
Toiyabe National Forest, Sawtooth
National Forest, Inyo National Forest,
and Modoc National Forest.
Revisions to the planning regulations
adopted on November 9, 2000 (65 FR
67514) did not retain the management
indicator species requirement, but
rather stated: ‘‘Plan decisions affecting
species diversity must provide for
ecological conditions that the
responsible official determines provide
a high likelihood that those conditions
are capable of supporting over time the
viability of native and desired nonnative species well distributed
throughout their ranges within the plan
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area * * *’’ (65 FR 67514). Further
revisions have been proposed (67 FR
72770; December 6, 2002) but a final
rule has not been promulgated. Until
such time a rule is completed, officials
responsible for planning decisions may
use the management indicator
provisions.
As part of our status review process,
the members of the expert panel and the
Service’s decision support team of
senior Service biologists and managers
were provided with information
regarding NFMA and related
regulations, including the 1982 and
2000 planning regulations and the
recent interpretive rule, along with
information explaining that the Forest
Service had proposed, but not
promulgated, changes to the 2000
regulation. Since the meeting by the
expert panel and the Service’s decision
support team, the Forest Service has
promulgated a final planning rule at 36
CFR 219 and eliminated the 2000
planning rule. The new Forest Service
planning regulation became effective
when it was published in the Federal
Register on January 5, 2005 (70 FR
1023).
As described by the Forest Service,
plans developed under the new
regulation will be more strategic and
less prescriptive in nature than those
developed under the 1982 planning rule
(which has guided the development of
all forest plans to date). For instance,
plans previously might have included
standards for a buffer for activities near
the nest sites of birds sensitive to
disturbance during nesting, whereas
under the new rule a desired condition
description and guidelines will be
provided, rather than a set of
prescriptive standards that would apply
to projects. Planning and decisions for
projects and activities will address sitespecific conditions and identify
appropriate conservation measures to
take for each project or activity.
Under the new rule, the purpose of
forest plans is to establish goals and to
set forth guidance to follow in pursuit
of those goals. The rule calls for five
components of plans: desired
conditions, objectives, guidelines,
suitability of areas, and special areas (36
CFR 219.7(a)(2)). The rule states that
these components are intended to
provide general guidance and goals or
other information to be considered in
subsequent project and activity
decisions, and that none of these
components are commitments or final
decisions approving projects and
activities (36 CFR 219.7(a)(2)). Approval
of a plan, plan amendment, or plan
revision comprised of these five
components may be categorically
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excluded from NEPA documentation (36
219.4(b)). In a separate Federal Register
publication issued in conjunction with
the new planning rule, the Forest
Service announced a proposed revision
to one of its handbooks (FSH 1909.15,
Chapter 30) to include final decisions
on proposals to develop, amend, or
revise land management plans as one of
the categories of actions that will not
result in significant impacts on the
human environment and which are
therefore exempt from requirements to
prepare further NEPA documentation
(70 FR 1062; January 5, 2005).
The new rule requires that an
environmental management system
(EMS) be established for each unit of the
National Forest System and the EMS
may be established independently of the
planning process (36 CFR 219.5). Plan
development, amendment, or revision
must be completed in accordance with
direction at 36 CFR 219.14 and with the
EMS. The EMS must conform to the
standard developed by the International
Organization for Standardization (ISO),
specifically ISO 14001: Environmental
Management Systems—Specification
With Guidance for Use (36 CFR
219.5)(b)).
The new rule requires maintenance of
three types of evaluation reports: (1)
Comprehensive evaluation of current
social, economic, and ecological
conditions and trends that contribute to
sustainability (to be updated at least
every five years); (2) evaluation for a
plan amendment, which must analyze
issues relevant to the purposes of the
amendment; and (3) annual evaluation
of monitoring information (36 CFR
191.6). The rule specifies that the plan
must describe the monitoring program
for the plan area, and describes general
categories of items to be provided for in
the monitoring program (e.g.
determining the effects of various
resource management activities on the
productivity of the land) (36 CFR
219.6(b)). The new rule also includes a
provision that the responsible official
must take into account the best available
science (36 CFR 219.11) in the planning
process; the official also will consider
public input, competing use demands,
budget projects and other factors as
appropriate.
The new planning regulation does not
include provisions regarding habitat for
species viability. Rather, with regard to
ecological sustainability, plans are to
provide a framework to contribute to
sustaining native ecological systems by
providing ecological conditions to
support diversity of native plants and
animal species in the plan area (36 CFR
219.10 (b)). Ecosystem diversity is
described as being the primary means
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by which a plan contributes to
sustaining ecological systems (36 CFR
219.10 (b)), and the Forest Service states
that this focus is expected to conserve
most species. If the Responsible Official
determines that provisions in plan
components, beyond those addressing
ecosystem diversity, are needed ‘‘to
provide appropriate ecological
conditions for specific threatened and
endangered species, species-of-concern,
and species-of-interest, then the plan
must include additional provisions for
these species, consistent with the limits
of agency authorities, the capability of
the plan area, and overall multiple use
objectives’’ (36 CFR 219.10(b)(2)). The
rule defines species-of-concern as
‘‘Species for which the Responsible
Official determines that management
actions may be necessary to prevent
listing under the Endangered Species
Act’’ and defines species-interest as
‘‘Species for which the Responsible
Official determines that management
actions may be necessary or desirable to
achieve ecological or other multiple use
objectives’’ (36 CFR 219.16).
The new rule does not include
Management Indicator Species. It
specifies that for national forest system
units with plans developed, amended,
or revised using the 1982 planning
regulations, compliance with any
obligations relating to management
indicator species may be achieved by
considered data and analysis relating to
habitat (as compared to the 1982
regulation that required population
trend data) unless the plan specifically
requires population monitoring or
population surveys for the species, and
also specifies that site-specific
monitoring or survey of a proposed
project or activity area (pertaining to
such species) is not required in relation
to such species (36 CFR 219.14(f)).
For each unit of the National Forest
System, the transition period for the
new rule is three years or at the unit’s
establishment of an EMS, whichever
comes first (36 CFR 219.14). A
document approving a plan developed,
revised, or amended using the new
regulation must include a description of
the effects of the plan on existing,
permits, contracts, or other instruments
implementing approved projects and
activities (36 219.8(a)). If not expressly
excepted, approved projects and
activities must be consistent with the
applicable plan components, subject to
provisions in 36 219.8(e) that provide
options for addressing a use, project or
activity that is not consistent with the
applicable plan.
The supplementary information
provided with the new rule states that
the Forest Service is developing
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planning directives (i.e., manuals and
handbooks) regarding the use of this
new rule, and that proposed changes in
the directives will be available for
public comment as soon as possible
after adoption of the final rule.
The greater sage-grouse is designated
as a USFS sensitive species in Regions
1 (Northern Region—northern ID, MT,
ND, and northern SD), 2 (Rocky
Mountain Region—CO, WY), 4
(Intermountain Region—southern ID,
southwestern WY, UT, NV, eastern CA),
5 (Pacific Southwest Region—CA), and
6 (Pacific Northwest Region—OR, WA)
(USDA Forest Service, in litt. 2004).
These regions encompass the entire
range of the species in the United States
(USDA Forest Service, in litt. 2004).
Many forests within the range of sagegrouse provide important seasonal
habitats for the species, particularly the
Thunder Basin National Grassland and
the Humboldt-Toiyabe National Forest
(USDA Forest Service, in litt. 2004).
While the 1982 planning regulation,
including its provision for population
viability, was used in the development
of the existing Forest Plans, no
information has been provided to the
Service regarding specific
implementation of the above regulations
and policies for the greater sage-grouse.
Also, we have no information regarding
the results of sage-grouse population
monitoring for those National Forests
that identified it as a management
indicator species, and thus were subject
to the requirement in the 1982 rule to
monitor population trends and
determine relationships to habitat
changes.
Of the 34 National Forests within
greater sage-grouse range, approximately
half do not specifically address sagegrouse in their Forest Plans (USDA
Forest Service, in litt. 2004). Reasons for
this include lack of species occurrence,
incidental use of the National Forest
System lands by sage-grouse, or the
Forest Plan pre-dated concern for sagegrouse conservation (pre-2000; USDA
Forest Service, in litt. 2004). Direction
for the conservation of sage-grouse and
their habitats (at least indirectly) was
provided in 15 plans relative to
minerals management, 18 plans for fire
and fuels management, 24 for livestock
grazing actions, 10 for realty actions, 15
for recreation activities, 8 for recreation,
and 20 for vegetation management
(USDA Forest Service, in litt. 2004). The
effectiveness of these efforts for sagegrouse and their habitats was not
reported to us by the USFS (USDA
Forest Service, in litt. 2004).
The USFS incorporates conservation
measures for sage-grouse protection at
the project level through site-specific
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NEPA analyses, using the Western
Association of Fish and Wildlife
Agencies Sage-grouse management
guidelines (Connelly et al. 2000a) as a
reference (USDA Forest Service, in litt.
2004). According to USFS, if a specific
project location does not meet these
guidelines, management use standards
are developed and incorporated into the
design of the project to achieve these
conditions (USDA Forest Service, in litt.
2004). Temporal and seasonal
restrictions can also be implemented to
protect sage-grouse resources.
Other Federal agencies in the U.S.
Department of Defense, U.S. Department
of Energy, and the U.S. Department of
Interior (including the Bureau of Indian
Affairs, Fish and Wildlife Service, and
National Park Service) are responsible
for managing less than 5 percent of
sagebrush lands within the United
States (Connelly et al. 2004). The
National Park Service Organic Act (39
Stat. 535; 16 U.S.C. 1, 2, 3 and 4) states
that the NPS will administer areas
under their jurisdiction ‘‘* * * by such
means and measures as conform to the
fundamental purpose of said parks,
monuments, and reservations, which
purpose is to conserve the scenery and
the natural and historical objects and
the wildlife therein and to provide for
the enjoyment of the same in such
manner and by such means as will leave
them unimpaired for the enjoyment of
future generations.’’
The National Wildlife Refuge System
Administration Act (16 U.S.C. 668dd–
668ee) provides guidelines and
directives for administration and
management of all areas in the National
Wildlife Refuge system. This includes
wildlife refuges, areas for the protection
and conservation of fish and wildlife
that are threatened with extinction,
wildlife ranges, game ranges, wildlife
management areas, or waterfowl
production areas. Relatively few units
within the Refuge system have habitat
for the greater sage-grouse. Refuges are
managed for species conservation,
consistent with direction in the National
Wildlife Refuge System Administration
Act, as amended, and related Service
polices and guidance.
The Department of the Army has
developed Integrated Natural Resources
Management Plans for their facilities
within sage-grouse habitats. These plans
‘‘reflect the mutual agreement of the
facility, the Fish and Wildlife Service
and the appropriate State fish and
wildlife agency on the conservation,
protection and management of fish and
wildlife resources’’ (Department of the
Army, in litt. 2004). Six Army facilities
have confirmed sage-grouse presence,
and integrated plans have been
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developed for all. While some agencies
have developed site-specific plans for
conserving sage-grouse habitats on their
lands (i.e., Yakima Training Center,
Seedskadee National Wildlife Refuge),
we do not have monitoring data
regarding the effectiveness of these
management actions.
In 1992, we entered into a voluntary
Conservation Agreement with the Army
and the WADFW for sage-grouse
occurring at the Yakima Training Center
(66 FR 22984) in Washington. The
Conservation Agreement expired April
30, 2000 (66 FR 22984). Efforts to
update and implement a revised
Conservation Agreement for sage-grouse
throughout Washington are ongoing (66
FR 22984). In our 2003 Candidate
Notice of Review we concluded that the
Army is implementing conservation
measures and considerably less-thanplanned training activities in Yakima
and Kittitas Counties, the location of the
sage-grouse that are part of the
Columbia Basin DPS of the greater sagegrouse (69 FR 24875).
The Natural Resources Conservation
Service (NRCS) of the U.S. Department
of Agriculture assists farmers, ranchers,
and other private landowners in
reducing threats to sage-grouse habitat
by providing technical assistance and
financial resources to support
management and habitat restoration
efforts; helping farmers and ranchers
maintain and improve habitat as part of
larger management efforts; and
developing technical information to
assist NRCS field staff with sage-grouse
considerations when working with
private landowners. The United States
Congress recently appropriated $5
million for NRCS to use in 2005 to fund
sage-grouse conservation efforts on
public and private lands across the
range of the greater sage-grouse (PL 108–
447). One example of these conservation
efforts is found in Douglas County,
Washington, the site of the northern
subpopulation of the Columbia Basin
DPS. Large areas of privately-owned
lands are currently withdrawn from
crop production and planted to native
and non-native cover under the NRCS’
Conservation Reserve Program (CRP) (69
FR 24875).
Executive Order 13112 on Invasive
Species (64 FR 6183) was signed on
February 3, 1999. It seeks to prevent the
introduction of invasive species and
provide for their control and minimize
their impacts through better
coordination of federal agency efforts
under a National Invasive Species
Management Plan to be developed by an
interagency Invasive Species Council.
The Order directs all federal agencies to
address invasive species concerns as
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well as refrain from actions likely to
increase invasive species problems (E.O.
13112).
Executive Order 13112 requires the
National Invasive Species Council
(Council) to produce a National
Management Plan (NMP) for Invasive
Species every two years (E.O. 13112). In
January 2001, the Council released the
first NMP, which serves as a blueprint
for all federal action on invasive
species. It provides goals and objectives
for invasive species management,
research needs, and measures to
minimize the risk of species
introductions. Although individual
States have regulations regarding
invasive species, we were unable to
determine if these regulations will affect
sage-grouse habitats.
Canadian Federal and Provincial Laws
and Regulations
Greater sage-grouse are cooperatively
managed by Provincial and Federal
governments in Canada. The species is
afforded Federal legal protection under
schedule 1 of the Species at Risk Act
(SARA; Canada Gazette, Part III, Chapter
29, Vol. 25, No. 3, 2002). Passed in
2002, the Species at Risk Act is similar
to the Endangered Species Act and
allows for habitat regulations to protect
sage-grouse (Aldridge and Brigham
2003). The purpose of the SARA is to
prevent the extinction or extirpation of
any indigenous Canadian wildlife
species, subspecies or distinct
population segment. SARA also
provides for the recovery of endangered
or threatened wildlife and encourages
the management of other species to
prevent them from becoming species at
risk (Connelly et al. 2004).
Greater sage-grouse are classified as
resident wildlife by the Provinces
(Connelly et al. 2004). The species is
listed as endangered at the Provincial
level in Alberta and Saskatchewan, and
neither Province allows harvest
(Aldridge and Brigham 2003; Connelly
et al. 2004). Alberta manages greater
sage-grouse under the statutory
authority of Chapter W–10 of its
Wildlife Act (Revised Statutes of Alberta
(RSA) 2000). Individual birds are
protected in Alberta, but their habitat is
not. The Provincial laws also provide
for the development of recovery
strategies and plans (Connelly et al.
2004). Alberta has developed voluntary
guidelines to protect leks (Aldridge and
Brigham 2003). Provincial laws in
Saskatchewan prevent sage-grouse
habitat from being sold or from having
native vegetation cultivated (Aldridge
and Brigham 2003). The Saskatchewan
Wildlife Act provides protection for
sage-grouse nests and lek sites by
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providing spatial and temporal
restrictions. No developments are
permitted within 500 m (550 yards) of
leks and no construction is allowed
within 1,000 m (1,100 yards) of leks
between March 15 and May 15
(Aldridge and Brigham 2003).
Summary of Factor D
Various regulatory mechanisms that
guide the protection and conservation of
the greater sage-grouse are in place. The
members of the expert panel and the
Service’s decision support team were
provided with more detailed
information than we have summarized
above regarding regulatory mechanisms
pertaining to the greater sage-grouse.
Based on the best scientific and
commercial data available we have
concluded that existing regulatory
mechanisms do not endanger or
threaten the greater sage-grouse
throughout all or a significant portion of
its range. Based on the current status of
the greater sage-grouse and the fact that
the lands administered by the Forest
Service comprise a relatively small
percentage of sagebrush habitat
(approximately 8 percent) in the United
States, the new Forest Planning
regulation does not result in a change in
our conclusion regarding the adequacy
of existing regulatory mechanisms.
E. Other Natural or Manmade Factors
Affecting Its Continued Existence
Pesticides
Few studies have examined the effects
of pesticides to sage-grouse, but at least
one has documented direct mortality of
greater sage-grouse as a result of
ingestion of alfalfa sprayed with
organophosphorus insecticides (Blus et
al. 1989, Blus and Connelly 1998). In
this case, a field of alfalfa was sprayed
with dimethoate when approximately
200 sage-grouse were present; 63 of
these sage-grouse were later found dead,
presumably as a result of pesticide
exposure (Blus et al. 1989, Blus and
Connelly 1998). A comparison of
applied levels of herbicides with
toxicity studies of grouse, chickens, and
other gamebirds (Carr 1968, as cited in
Call and Maser 1985) concluded that
herbicides applied at recommended
rates should not result in sage-grouse
poisonings.
Game birds that ingested sub-lethal
levels of pesticides have been observed
exhibiting abnormal behavior that may
lead to a greater risk of predation
(Dahlen and Haugen 1954, McEwen and
Brown 1966, Blus et al. 1989). McEwen
and Brown (1966) reported that wild
sharp-tailed grouse poisoned by
malathion and dieldrin exhibited
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depression, dullness, slowed reactions,
irregular flight, and uncoordinated
walking. Although no research has
explicitly studied the indirect levels of
mortality from sub-lethal doses of
pesticides (e.g., predation of impaired
birds), it has been assumed to be the
reason for mortality among some study
birds (McEwen and Brown 1966, Blus et
al. 1989, Connelly and Blus 1991). Both
Post (1951) and Blus et al (1989) located
depredated sage-grouse carcasses in
areas that had been treated with
insecticides. Exposure to these
insecticides may have predisposed sagegrouse to predation. Sage-grouse
mortalities were also documented in a
study where they were exposed to
strychnine bait type used to control
small mammals (Ward et al. 1942 as
cited in Schroeder et al. 1999).
A reduction in insect population
levels resulting from insecticide
application can potentially affect
nesting sage-grouse females and chicks
(Willis et al. 1993, Schroeder et al.
1999), although we could find no
information on this specific issue for the
greater sage-grouse. Eng (1952) noted
that after a pesticide was sprayed to
reduce grasshoppers, bird population
levels decreased by 50 to 100 percent
depending upon which chemical was
used. He further stated that it appeared
that nestling development was
adversely affected due to the reduction
in grasshoppers. Potts (1986 in Connelly
and Blus 1991) determined that reduced
food supply resulting from the use of
pesticides ultimately resulted in high
starvation rates of partridge chicks. In a
similar study on partridges, Rands
(1985) found that pesticide application
adversely affected brood size and chick
survival by reducing chick food
supplies.
Three approved insecticides,
carbarayl, diflubenzuron, and
malathion, are applied across the extant
range of sage-grouse as part of
implementation of the Rangeland
Grasshopper and Mormon Cricket
Suppression Control Program, under the
direction of the Animal and Plant
Health Inspection Service (APHIS)
(APHIS 2004). Carbaryl is applied as
bait, while the others are sprayed.
Application rates are in compliance
with U.S. Environmental Protection
Agency regulations. APHIS has general
guidelines for buffer zones around
sensitive species habitats. These
pesticides are applied wherever
grasshopper and Mormon cricket
control are requested by private
landowners (APHIS 2004). We were
unable to find any information
regarding the effects these pesticide
applications may have on sage-grouse.
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Herbicide applications can kill
sagebrush and forbs important as food
sources for sage-grouse (Carr 1968 as
cited in Call and Maser 1985). The
greatest impact resulting from a
reduction of either forbs or insect
populations is for nesting females and
chicks due to the loss of potential
protein sources that are critical for
successful egg production and chick
nutrition (Schroeder et al. 1999;
Johnson and Boyce 1991).
In summary, pesticides can result in
direct mortality of individuals, and can
also reduce the availability of food
sources, which in turn could contribute
to mortality of sage-grouse. Despite
these potential effects we could find no
information to indicate that the use of
pesticides, at current levels, negatively
affects greater sage-grouse populations
(see also Schroeder et al. 1999), and
many of the pesticides that have been
shown to have an effect have been
banned in the U.S. for more than 20
years.
Contaminants
Across the range of the greater sagegrouse exposure to various types of
environmental contaminants either
occur, or may potentially occur, as a
result of a variety of human activities,
including agricultural and rangeland
management practices, mining, energy
development and pipeline operations,
nuclear energy production and research,
and transportation of materials along
highways and railroads. Many of these
potential exposures and their effects
have been discussed above. In addition,
numerous gas and oil pipelines occur
across the range of the species. Exposure
to oil or gas from spills or leaks could
impact sage-grouse and cause
mortalities or morbidity. Similarly,
given the extensive network of
highways and railroad lines that occur
throughout the range of the greater sagegrouse there is some potential for
exposure to contaminants resulting from
hazardous materials spills or leaks along
these transportation corridors. However
these types of spills occur infrequently
in only small portions of sage-grouse
range and we could not locate any
documented occurrences of impacts to
sage-grouse from them.
There are no nuclear power plants
within the area of current distribution of
the greater sage-grouse and there is only
one that occurs in range formerly
occupied by the species (Nuclear Energy
Institute Web page https://www.nei.org
2004). Sage-grouse do occur on the U.S.
Department of Energy’s Idaho National
Engineering Laboratory in eastern Idaho
(Connelly and Markham 1983).
Exposure of sage-grouse to
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radionuclides (radioactive atoms) has
been documented at this site (Connelly
and Markham 1983). Although
researchers noted the presence of
varying levels of radionuclides in
greater sage-grouse at this site they did
not report any harmful effects to the
population (Connelly and Markham
1983).
Indirect effects of contaminants on
greater sage-grouse include loss of
habitat components, such as food or
cover. The indirect effects of
contaminants from agriculture, mining
operations, energy development and
distribution, or hazardous waste spills
along roads and railroad lines, can
result in the killing of plants or insects
that provide food for sage-grouse.
Although the expert panel identified
contaminants in the list of extinction
risk factors for sage-grouse, it received
the lowest ranking of relative
importance.
Recreational Activities
Studies have determined that nonconsumptive recreational activities can
degrade wildlife resources, water, and
the land by distributing refuse,
disturbing and displacing wildlife,
increasing animal mortality, and
simplifying plant communities (Boyle
and Samson 1985). Sage-grouse
response to disturbance may be
influenced by the type of activity,
recreationist behavior, predictability of
activity, frequency and magnitude,
activity timing, and activity location
(Knight and Cole 1995). Examples of
recreational activities in sage-grouse
habitats include hiking, camping, pets,
and off-highway vehicle (OHV) use.
Although we have not located any
published literature concerning
recreational effects on sage-grouse, they
could disturb sage-grouse on leks and in
nesting areas. Baydack and Hein (1987)
reported displacement of male sharptailed grouse at leks from human
presence resulting in loss of
reproductive opportunity during the
disturbance period. Female sharp-tailed
grouse were observed at undisturbed
leks while absent from disturbed leks
during the same time period (Baydack
and Hein 1987). Disturbance of
incubating female sage-grouse could
cause displacement from nests,
increased predator risk, or loss of nests.
Disruption of sage-grouse during
vulnerable periods at leks, or during
nesting or early brood rearing, however,
could affect reproduction or survival
(Baydack and Hein 1987). However, we
were unable to find any published
information regarding effects to sagegrouse as a result of these factors. The
presence of pets in proximity to sage-
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grouse can result in sage-grouse
mortality or disturbance, and increases
in garbage from human recreators can
attract sage-grouse predators and help
maintain their numbers at increased
levels.
Indirect effects to sage-grouse from
recreational activities include impacts
to vegetation and soils, and facilitating
the spread of invasive species. Payne et
al. (1983) studied OHV impacts to
rangelands in Montana, and found longterm (2 years) reductions in sagebrush
shrub canopy cover as the result of
repeated trips in the area. Increased
sediment production and decreased soil
infiltration rates were observed after
disturbance by motorcycles and fourwheel drive trucks on two desert soils
in southern Nevada (Eckert et al. 1979).
However, we could find no information
that quantified impacts to the sagebrush
community or to sage-grouse
populations.
We are unaware of scientific reports
documenting direct mortality of greater
sage-grouse through collision with offroad vehicles. Similarly, we did not
locate any scientific information
documenting instances where snow
compaction as a result of snowmobile
use precluded greater sage-grouse use,
or affected their survival in wintering
areas. Off-road vehicle or snowmobile
use in winter areas may increase stress
on birds and displace sage-grouse to less
optimal habitats. However, there is no
empirical evidence available
documenting these effects on sagegrouse, nor could we find any scientific
data supporting the possibility that
stress from vehicles during winter is
limiting greater sage-grouse populations.
The expert panel identified human
activities within greater sage-grouse
habitats as an extinction risk factor.
However, this factor ranked relatively
low.
Drought/Climate Change
Drought is a common occurrence
throughout the range of the greater sagegrouse (Braun 1998). Drought reduces
vegetation cover (Milton et al. 1994;
Connelly et al. 2004), potentially
resulting in increased soil erosion and
subsequent reduced soil depths,
decreased water infiltration, and
reduced water storage capacity. Drought
can also exacerbate other natural events,
such as defoliation of sagebrush by
insects. Approximately 2,544 km2 (982
mi2) of sagebrush shrublands died in
Utah in 2003 as a result of drought and
infestations with the Aroga (webworm)
moth (Connelly et al. 2004). Sage-grouse
are affected by drought through the
potential loss of vegetative habitat
components and reduced insect
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production (Connelly and Braun 1997).
These habitat component losses can
result in declining sage-grouse
populations due to increased nest
predation and early brood mortality
associated with decreased nest cover
and food availability (Braun 1998;
Schroeder et al. 1999).
Sage-grouse populations declined
during the 1930s period of drought
(Patterson 1952; Willis et al. 1993;
Braun 1998). Drought conditions in the
late 1980s and early 1990s also
coincided with a period when sagegrouse populations were at historically
low levels (Connelly and Braun 1997).
Although drought has been a consistent
and natural part of the sagebrush-steppe
ecosystem, drought impacts on the
greater sage-grouse can be exacerbated
when combined with other habitat
impacts that reduce cover and food
(Braun 1998). Many studies discuss the
effects of decreased insect and forb
production to sage-grouse, but we could
find no research specifically addressing
drought effects on sage-grouse
populations.
Short-term climatic cycles over
timescales of decades can affect plant
community dynamics, potentially
resulting in a shift in successional stage
(Connelly et al. 2004). Long-term
changes in climate and atmospheric
conditions over timescales of centuries
will shift competitive advantage among
individual plant species (Connelly et al.
2004). Environmental changes resulting
from climate change could facilitate
invasion and establishment of invasive
species or exacerbate the fire regime,
thereby possibly accelerating the loss of
sagebrush habitats (Connelly et al.
2004). Increases in the expansion of
pinyon and juniper woodlands in the
Great Basin may have resulted from a
combination of poor habitat
management and climate change
(Connelly et al. 2004). The potential
conversion of habitats as a result of
climate change could have long-term
effects on sage-grouse populations
(Connelly et al. 2004). We have no
evidence however, that past climate
change has directly affected sage-grouse
populations.
One expert panelist identified climate
change as the primary extinction risk
factor for the greater sage-grouse. While
the other panelists did not score this
factor as highly, most acknowledged
that long-term ongoing climate change
will result in changes within the
sagebrush ecosystem that may be
negative for the greater sage-grouse.
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Life History Traits Affecting Population
Viability
Sage-grouse have comparatively low
reproductive rates and high annual
survival (Schroeder et al. 1999;
Connelly et al. 2000a), resulting in
slower potential or intrinsic population
growth rates than typical of other game
birds. Therefore, recovery of
populations after a decline from any
reason may require years. Also, as a
consequence of their site fidelity to
breeding and brood-rearing habitats,
measurable population effects may lag
behind, negative habitat impacts that
may occur (Wiens and Rotenberry
1985). While these natural history
characteristics would not limit sagegrouse populations across large
geographic scales under historical
conditions of extensive habitat, they
may contribute to local population
declines when humans alter habitats or
mortality rates.
Sage-grouse have one of the most
polygamous mating systems observed
among birds (Deibert 1995).
Asymmetrical mate selection (where
only a few of the available members of
one sex are selected as mates) should
result in reduced effective population
sizes (Deibert 1995), meaning the actual
amount of genetic material contributed
to the next generation is smaller than
predicted by the number of individuals
present in the population. With only 10
to 15 percent of sage-grouse males
breeding each year (Aldridge and
Brigham 2003), the genetic diversity of
sage-grouse would be predicted to be
low. However, in a recent survey of 16
greater sage-grouse populations, only
the Columbia Basin population in
Washington showed low genetic
diversity, likely as a result of long-term
population declines, habitat
fragmentation, and population isolation
(Benedict et al. 2003; Oyler-McCance et
al., In press). The level of genetic
diversity in the remaining range of sagegrouse has generated a great deal of
interest in the field of behavioral
ecology, specifically sexual selection
(Boyce 1990; Deibert 1995). There is
some evidence of off-lek copulations in
sage-grouse (copulations that occur off
the lek by subordinate males), as well as
multiple paternity within one clutch
(Connelly et al. 2004). Dispersal may
also contribute to genetic diversity, but
little is known about dispersal in sagegrouse (Connelly et al. 2004). However,
the lek breeding system suggests that
population sizes in sage-grouse must be
greater than non-lekking birds to
maintain long-term genetic diversity.
Aldridge and Brigham (2003)
estimated that up to 5,000 individual
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sage-grouse may be necessary to
maintain an effective population size of
500 birds. Their estimate was based on
individual male breeding success,
variation in reproductive success of
males that do breed, and the death rate
of juvenile birds. We were unable to
find any other published estimates of
minimal population sizes necessary to
maintain genetic diversity and longterm population sustainability in sagegrouse.
Summary of Factor E
In our 90-day petition finding, we
identified several other natural or
manmade factors (i.e. endocrine
disruption, competition with other bird
species, and direct mortality from fires
and snowmobiles) that might potentially
pose a threat to the greater sage-grouse.
However, for this analysis, we could
find no supporting information to
indicate that any of these are
endangering or threatening sage-grouse
populations.
One expert panelist identified climate
change, and resultant habitat changes
from invasive species establishment, as
the most significant threat factor for the
sagebrush ecosystem. However, the
imminent threats to this ecosystem were
not thought to be sufficient to endanger
or threaten the greater sage-grouse
within the defined foreseeable future.
Thus, based on the best scientific and
commercial data available, including
input from the expert panel, we have
concluded that other natural and
manmade factors do not endanger or
threaten the sage-grouse throughout all
or a significant portion of its range.
Petition Finding
We have carefully assessed the best
scientific and commercial information
available regarding the past, present,
and future threats faced by this species.
We reviewed the three petitions,
information available in our files, other
published and unpublished
information, and comments submitted
to us during the public comment period
following our 90-day petition finding,
and we consulted with recognized
experts and other resource agencies. On
the basis of the best scientific and
commercial information available, we
find that the petitioned action to list the
greater sage-grouse is not warranted at
this time. Although sagebrush habitat
continues to be lost and degraded in
parts of the greater sage-grouse’s range
(albeit at a lower rate than historically
observed), from what we know of the
current range and distribution of the
sage-grouse, its numbers are well
represented. As a result, we find that the
species is not in danger of extinction,
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nor is it likely to become endangered in
the foreseeable future. We are
encouraged that sage-grouse and
sagebrush conservation efforts will
moderate the rate and extent of habitat
loss for the species in the future. We
strongly encourage the continuation of
these efforts.
As described earlier in this document
(see Status Review Process), the status
review was conducted in two stages: (1)
A risk analysis stage which consisted of
compiling biological information,
conducting the PECE analysis of
conservation efforts, and conducting a
facilitated extinction risk assessment by
a panel of experts, and (2) a risk
management stage where senior Service
biologists and managers evaluated
whether or not the greater sage-grouse
qualifies as threatened or endangered
under the Act.
Prior to estimating the risk of
extinction in the risk analysis stage, the
expert panel agreed on the 19 most
important threats to sage-grouse across
its range. To better understand the
impact of these threats to the survival of
the species, each expert assigned a
relative rank to each threat within each
of three different geographical
distinctions. These included the eastern
and western portion of the range of the
greater sage-grouse and the whole range
of the species (Figure 1). Dividing the
range of the species into an eastern and
western region for the purposes of the
expert panel exercises was intentional
to help Service biologists and managers
and the expert panelists understand the
importance of the various threats to the
species at different geographical scales.
The relative rankings of the identified
threats reflect that some threats are
regional in nature while others express
themselves across the whole range of
the species. Threats that ranked low on
a regional and rangewide basis were
considered to operate at the local or sitespecific level where they occurred.
In reaching these rankings the expert
panelists reviewed an initial list of
threats that was generated from the
synthesis of biological information the
Service had prepared, and through a
discussion among the panelists held in
front of the Service’s decision support
team, added to that list and modified it
before agreeing to a list of the most
important threats. Ranking of the
relative importance of those threats
occurred in two stages. First, each
panelist was asked to anonymously rank
the 19 threats from most to least
significant. After an initial scoring by
the experts occurred, the ranks were
presented to the expert panel by a
facilitator in front of the decision
support team and the experts discussed
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why they ranked as they did. After this
discussion the experts rescored the
threats. The threats that moved to the
top of the list are, in order, invasive
species, infrastructure as related to
energy development and urbanization,
wildfire, agriculture, grazing, energy
development, urbanization, strip/coal
mining, weather, and pinyon-juniper
expansion.
The threat ranking component of the
structured process was important for
three reasons: (1) It provided an
informed, science based, ranking of the
threats to the species, (2) the
discussions that occurred in formulating
the threat list and the discussions
among the experts after their initial
scoring played a critical role in helping
the Service’s decision support team
understand the magnitude of a threat
and the geographical scale at which a
threat operated, and (3) it provided via
the threat ranking and the discussion
among experts, the foundation for the
expert panel to conduct an extinction
risk analysis.
The highest ranking threats exert their
influence primarily through habitat loss.
Thus, our structured analysis process
revealed that at this time habitat loss
appears to be the most important threat
to the greater sage-grouse, a conclusion
consistent with the available biological
information and our 90-day finding.
It is clear there are various threats to
the sagebrush steppe ecosystems upon
which the greater sage-grouse depends.
However, we are aware of no
quantitative projections of extinction
risk for the greater sage-grouse in the
face of these rangewide, regional and
local threats. This information gap is
important because the Act’s definitions
of threatened and endangered are
closely tied to risk of extinction. We
therefore elicited quantitative estimates
of time to extinction from the expert
panelists. Besides their own expertise,
the panelists prepared for estimating
future risk by reading a wide variety of
background materials, and they
participated in two days of discussions
of relevant sage-grouse life history
attributes, threats (summarized above),
the land ownerships and allocations, the
regulatory setting and management
challenges currently existing across the
landscape, the size and distribution of
the major sage-grouse population
centers, and state by state indices of
population status. After these
deliberations, the expert panelists were
asked to quantitatively express their
beliefs about when the greater sagegrouse might go extinct.
Panelists expressed their beliefs about
most likely time to extinction on score
sheets where the future was broken
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down into the following time intervals:
1–20, 21–40, 41–60, 61–80, 81–100,
101–200 and more than 200 years.
Panelists expressed biological
uncertainty about the most likely time
to extinction by spreading 100 points
over the various time intervals. The
experts were not uniform in their
estimates of the most likely time to
extinction although five of the seven
panelists believed that the sage-grouse
would not face extinction for at least
100 years. One panelist, for example,
believed the most likely time to
extinction is in the time period 61 to 80
years from present, one believed the
most likely time is 81 to 100 years from
present, 2 panelists believed the most
likely time to extinction is in the period
101 to 200 years from present, 1 panelist
split points equally between the 101 to
200 year and 200+ year categories, and
2 panelists believed the most likely time
to extinction was in the 200+ year
category. Most of the panelists, for
example spread points over several time
intervals, from a period less than 100
years in the future to the greater than
200 years category, expressing
individual uncertainty about the most
likely time to extinction. On one count
the experts performed very uniformly;
no points were allocated by any panelist
for the two time intervals within 40
years of present.
In their deliberations about the most
likely time to extinction, the experts
engaged in wide-ranging discussions of
future risk which included West Nile
virus, management advances in
addressing threats, the expectation that
there will still be some vast areas of
sagebrush habitat at least 100 years in
the future, looking into the past to help
predict the future, the difficulty of
controlling invasive annual plants, the
major native perennial grass
communities and their resiliency in the
eastern versus the western part of the
range, the role and geographic extent of
infrastructure development, role of
population subdivision for population
vulnerability, plant community
oscillations, climate oscillations, limited
role of predators, and the elusiveness of
cause-effect relationships for sagegrouse population trends, especially the
increases seen in the most recent
sampling (1993 to 2003).
After the extinction risk estimate
exercise was completed the experts
were asked to describe data gaps that, if
resolved, could reduce uncertainty in
their scores or even change their
estimates. This question generated a
wide-ranging discussion of uncertainty
and data gaps. In some cases research
programs were proposed. Areas of
uncertainty discussed by the experts
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included: systematic relationships
among various grouse species;
underlying mechanisms by which sagegrouse populations respond to habitat
changes; how to scale grouse habitat
preference up to the level at which
federal land is managed; lack of studies
across the range limits inferences;
effects of invasive plants; application of
grazing techniques to favor sagebrush
habitat; underutilization of the case
study approach for sage-grouse
management; future gas and oil
development impacts; future advances
in horticulture and fire suppression; the
role of crested wheatgrass in sagebrush
management; and the effectiveness of
CRP program. No attempt was made to
rank the effects of these and other areas
of uncertainty on the estimates of future
risk.
This list of data gaps and
uncertainties helps explain some of the
biological uncertainty that limits our
understanding of future risk to the
greater sage-grouse. The Service,
however, must make its decision about
whether this species qualifies as
threatened or endangered under the Act
based on the best available scientific
and commercial data, even if there is
uncertainty. To help increase the
chances of making an optimal decision
about whether or not to list, the decision
support team of senior Service biologists
and managers (described above—see
Status Review Process) participated in a
structured analysis that included a
discussion of the Act’s statutory
requirements, in particular the Act’s
definitions of threatened and
endangered, and a review of the
information from the risk analysis and
all other compiled biological
information. Finally they participated in
an exercise where they compared the
information about risk to sage-grouse,
including explicit measures of
uncertainty, against the statutory
requirements of the Act. In this exercise,
much like the extinction risk exercise
described above, the decision support
team was asked to express their beliefs
about the optimal status category for the
greater sage-grouse. The Act defines
endangered and threatened as:
Endangered species means any species in
danger of extinction throughout all or a
significant portion of its range.
Threatened species means any species
which is likely to become an endangered
species within the foreseeable future
throughout all or a significant portion of its
range.
The basic question facing the decision
support team was whether the factors
influencing the greater sage-grouse and
its habitat place it in danger of
extinction or whether they are likely to
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cause it to become endangered in the
foreseeable future. Estimates of
extinction risk help address this
question; however, neither general
classification thresholds nor
standardized criteria for establishing
species-specific thresholds have yet
been adopted for Service use.
The Service decision support team
discussed the extinction risk threshold
concept generally, and discussed
previous Service applications. With
regard to the foreseeable future, team
members agreed by consensus that given
all of the uncertainties, a reasonable
timeframe for ‘‘foreseeable future’’ for
the threatened definition is
approximately 30 to 100 years (about 10
greater sage-grouse generations to 2
sagebrush habitat regeneration cycles).
The decision support team reflected on
the ‘‘significant portion of the range’’
term, and discussed previous
applications by the Service. The team
reviewed the findings of the risk
analysis phase and found that while
different threats are asserting
themselves at different rates in different
parts of the range, it is difficult to find
major variation in risk over significant
portions of the range. Discussions by the
expert panel in the risk analysis phase
indicated that if the species continues to
decline, the most likely scenario would
include some combination of losses
around the edges of some portions of the
range, some localized losses and
fragmentation of larger core areas, but
these projected losses are geographically
unknown at this time and difficult to
predict. Thus, in the absence of major
geographical variation in projected
extinction risk, or any measure of the
spatial extent or location of projected
future losses, it was decided by
consensus that there was not a
significant portion of the range in which
threats to sage-grouse are greater than
range-wide threats.
To help further inform the Service’s
finding, the decision support team’s
final exercise assessed their beliefs
about what the appropriate petition
finding should be: not-warranted,
threatened, or endangered. The team
had read the compiled background
materials, observed the two-day risk
assessment discussions of the expert
panelists, which included explicit
measures of uncertainty, and
participated in general and specific
discussions about the application of the
Act’s definitions of the threatened and
endangered categories.
None of the decision support team
assigned any of their 100 points to the
endangered category; however, all
decision support team members placed
some of their points in the threatened
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category. The average number of points
assigned to the not-warranted and
threatened categories were, respectively,
74 (range 50–85) and 26 (range 15–50).
The fact that all decision support team
members placed some of their points in
the threatened category reflects a degree
of biological uncertainty associated with
making scientific decisions.
Nevertheless, the ‘‘not warranted’’
finding was based on the best scientific
and commercial information available at
the time of their recommendation.
The best available scientific and
commercial information, as summarized
within this finding and in the
Conservation Assessment of Greater
Sage-Grouse and Sagebrush Habitats
prepared by WAFWA, clearly reflect
that there are a myriad of changes
occurring within the sagebrush
ecosystem that can impact sage-grouse.
Our structured analysis process not only
confirmed that many of these changes
are indeed threats to the sage-grouse but
it clarified the relative importance of
these threats at different geographical
scales which is an important factor
when making a listing determination of
such a widely dispersed species. The
results reflect the opinion of the expert
panelists that some threats are clearly
important across the range of the sagegrouse while others are important on a
regional scale.
In determining that the greater sagegrouse does not warrant protection
under the Act, the Service biologists and
managers who participated in the
structured analysis process
acknowledged that there are real threats
to the sage-grouse and its habitat.
However, in formulating their
recommendation, these biologists and
managers noted that there is uncertainty
in how these threats will impact the
grouse in the future and that there were
reasons to be encouraged by current
assessments of grouse population status,
trends and distribution.
The higher ranking threats, while
rangewide and regional in scale, are to
a large degree prospective in nature
(e.g., invasive species, infrastructure,
wildfire, oil and gas development and
conifer invasion). Neither the Service
nor the expert panelists could predict
how these threats will develop over
time or interact with each other or with
different less important threats to
accelerate habitat loss or other impacts
to the grouse. This uncertainty was
explicitly noted by several of the
Service biologists and managers as part
of the reason for a not-warranted
recommendation. The Act requires the
Service to make a decision based on
what is known at the time of listing.
However, most Service biologists and
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2281
managers on the decision support team
also noted the future health of both the
sagebrush system and the sage-grouse
would depend on how the threats are
expressed and how managers responded
to them in the next 5 to 20 years. This
uncertainty about the future impact of
the threats to sage-grouse may also be
reflected in why some experts projected
sage-grouse extinction risk at 60 years
while others felt that beyond 200 years
was more realistic.
It is clear that the number of greater
sage-grouse rangewide has declined
from historically high levels, with well
documented declines between 1960 and
1985. However, the most recent data
reflect that overall declines have
slowed, stabilized or populations have
increased. These data and the fact that
92% of the known active leks occur in
10 core populations across 8 western
states, and that 5 of these populations
‘‘were so large and expansive that they
were subdivided into 24 subpopulations
to facilitate analysis’’ (Connelly et al.
2004: page 13–4), was cited by managers
on the decision support team as part of
the reason for their not warranted
recommendation.
Although the decision support team
referenced the prospective nature of the
higher ranking threats in reaching their
recommendation, they also
acknowledged and considered the fact
that these threats were currently
occurring at some level across the range
of the sage-grouse or in smaller regions
within the range. However, because of
the relatively long projected risk of
extinction, in many cases greater than
200 years, which was minimally 100
years beyond the foreseeable future the
Service considered in this case,
combined with considering the variety
of sources of information generated for
and during the risk analysis phase,
including the expert panel deliberations
and the Conservation Assessment from
WAFWA, the decision support team
found that the levels of these existing
threats, although very real, when
considered against the status, trends and
distribution of the current population,
were not sufficient to result in the
greater sage-grouse becoming an
endangered species in the next 40 to 100
years.
Other factors cited by the managers as
most important for their beliefs about
the appropriate listing category
included, the large size of the current
range, the slow pace with which some
of the threat factors are exerting
themselves, synergistic effects between
threats, large blocks of existing
sagebrush habitat, expected range
contractions, relative stability of core
population areas, expected increases in
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infrastructure development in areas that
currently have little or none, expected
population losses to increase the impact
of stochastic events, resiliency of
sagebrush habitats to some threats,
recent sage-grouse population trends as
stable or increasing, and some evidence
of positive changes on the sagebrush
landscape.
Factors contributing most to
uncertainty among the decision support
team members included the prospective
nature of some of the threats,
uncertainty about how pending threats
will be managed, and uncertainty about
how and if leks can persist in the
presence of disturbances.
Since the publication of our 90-day
finding we have compiled additional
materials and information on the greater
sage grouse. We believe we have a fairly
complete compilation of the existing
relevant information and much of it is
summarized above. We also convened a
panel of experts and conducted a
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structured analysis of risk. A decision
support team of Service biologists and
managers read selected background
materials and observed the deliberations
of the expert panel. To further inform
the Service’s final petition response, the
decision support team participated in a
structured analysis of the optimal listing
category where they assessed whether
the greater sage grouse qualifies as
threatened or endangered. After
considering the compiled information,
the risk assessment, the applicable
conservation actions, and the
assessment of the decision support
team, we find that the petitioned actions
are not warranted at this time.
We will continue to monitor the
status of the greater sage-grouse and
sagebrush ecosystems, and to accept
additional information and comments
from all governmental agencies, the
scientific community, industry, or any
other interested party concerning this
finding.
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References
A complete list of references used in
the preparation of this finding is
available upon request from the
Wyoming Field Office (see ADDRESSES
section).
Author
The primary author of this document
is Wyoming Field Office, U.S. Fish and
Wildlife Service, Cheyenne, Wyoming
(see ADDRESSES section).
Authority
The authority for this action is the
Endangered Species Act of 1973, as
amended (16 U.S.C. 1531 et seq.).
Dated: January 6, 2005.
Steve Williams,
Director, U.S. Fish and Wildlife Service.
[FR Doc. 05–583 Filed 1–10–05; 8:45 am]
BILLING CODE 4310–55–C
E:\FR\FM\12JAP2.SGM
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Agencies
[Federal Register Volume 70, Number 8 (Wednesday, January 12, 2005)]
[Proposed Rules]
[Pages 2244-2282]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 05-583]
[[Page 2243]]
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Part III
Department of the Interior
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Fish and Wildlife Service
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50 CFR Part 17
Endangered and Threatened Wildlife and Plants; 12-Month Finding for
Petitions To List the Greater Sage-Grouse as Threatened or Endangered;
Proposed Rule
Federal Register / Vol. 70 , No. 8 / Wednesday, January 12, 2005 /
Proposed Rules
[[Page 2244]]
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DEPARTMENT OF THE INTERIOR
Fish and Wildlife Service
50 CFR Part 17
Endangered and Threatened Wildlife and Plants; 12-Month Finding
for Petitions To List the Greater Sage-Grouse as Threatened or
Endangered
AGENCY: Fish and Wildlife Service, Interior.
ACTION: Notice of a 12-month petition finding.
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SUMMARY: We, the U.S. Fish and Wildlife Service (Service), announce a
12-month finding for three petitions to list the greater sage-grouse
(Centrocercus urophasianus) as threatened or endangered under the
Endangered Species Act of 1973, as amended. After reviewing the best
available scientific and commercial information, we find that listing
is not warranted. We ask the public to submit to us any new information
that becomes available concerning the status of or threats to the
species. This information will help us monitor and encourage the
conservation of this species.
DATES: The finding announced in this document was made on January 6,
2005. Although further listing action will not result from this
finding, we request that you submit new information concerning the
status of or threats to this species whenever it becomes available.
ADDRESSES: Comments and materials received, as well as supporting
documentation used in the preparation of this 12-month finding, will be
available for inspection, by appointment, during normal business hours
at the Wyoming Ecological Services Field Office, U.S. Fish and Wildlife
Service, 4000 Airport Parkway, Cheyenne, Wyoming 82001. Submit new
information, materials, comments, or questions concerning this species
to the Service at the above address.
FOR FURTHER INFORMATION CONTACT: The Wyoming Field Office (see
ADDRESSES section above), by telephone at (307) 772-2374, by facsimile
at (307) 772-2358, or by electronic mail at fw6_sagegrouse@fws.gov.
SUPPLEMENTARY INFORMATION:
Background
Section 4(b)(3)(B) of the Endangered Species Act of 1973, as
amended (Act) (16 U.S.C. 1531 et seq.), requires that, for any petition
to revise the Lists of Threatened and Endangered Wildlife and Plants
that contains substantial scientific or commercial information that the
action may be warranted, we make a finding within 12 months of the date
of the receipt of the petition on whether the petitioned action is: (a)
Not warranted, (b) warranted, or (c) warranted but precluded by other
pending proposals. Such 12-month findings are to be published promptly
in the Federal Register.
On July 2, 2002, we received a petition from Craig C. Dremann
requesting that we list the greater sage-grouse (Centrocercus
urophasianus) as endangered across its entire range. We received a
second petition from the Institute for Wildlife Protection on March 24,
2003 (Webb 2002) requesting that the greater sage-grouse be listed
rangewide. On December 29, 2003, we received a third petition from the
American Lands Alliance and 20 additional conservation organizations
(American Lands Alliance et al.) to list the greater sage-grouse as
threatened or endangered rangewide. On April 21, 2004, we announced our
90-day petition finding in the Federal Register (69 FR 21484) that
these petitions taken collectively, as well as information in our
files, presented substantial information indicating that the petitioned
actions may be warranted. In accordance with section 4(b)(3)(A) of the
Act, we have now completed a status review of the best available
scientific and commercial information on the species, and have reached
a determination regarding the petitioned action.
This status review of the greater sage-grouse does not address our
prior finding with regard to the Columbia Basin distinct population
segment (DPS). On May 7, 2001, we published a 12-month finding on a
petition to list the Washington population of the western subspecies of
the greater sage-grouse as a distinct population segment (DPS) (66 FR
22984). Our finding included a summary of the historic distribution of
what we then considered to be the western subspecies of the greater
sage-grouse (see ``Species Information'' below regarding taxonomy). In
our finding we determined that the population segment that remains in
central Washington met the requirements of our policy for recognition
as a distinct population segment (61 FR 4722) and that listing the DPS
was warranted but precluded by other higher priority listing actions.
Because the population in central Washington occurs entirely within the
historic distribution of sage-grouse within the Columbia Basin
ecosystem, we referred to it as the Columbia Basin DPS (66 FR 22984;
May 7, 2001). In subsequent candidate notices of review (CNORs),
including the most recent one published in the Federal Register on May
4, 2004 (69 FR 24875), we found that a listing proposal for this DPS
was still warranted but precluded by higher priorities. Since that time
new information has become available through this status review of the
greater sage-grouse. We will use the best scientific and commercial
information available (including, but not limited to information that
became available during this rangewide status review) to reevaluate
whether the Columbia Basin population still qualifies as a DPS under
our DPS policy, and if it does, whether the DPS still warrants a
listing proposal. Once that evaluation is completed, we will publish an
updated finding for the Columbia Basin population in the Federal
Register either in the next CNOR or in a separate notice.
Responses to Comments Received
We received 889 responses to our request for additional information
in our 90-day finding for the greater sage-grouse (69 FR 21484). Those
responses which contained new, updated, or additional information were
thoroughly considered in this 12-month finding. We received a large
number of identical or similar comments. We consolidated the comments
into several categories, and provide responses as follows.
Comment 1: It is premature for the Service to consider listing the
sage-grouse until the impact of local and State conservation efforts
are realized.
Response 1: The Service is required under section 4 of the Act to
determine whether or not listing is warranted within 12 months of
receiving a petition to list a species. By publishing a positive 90-day
finding in April, 2004 (69 FR 21484), we were required by the Act to
immediately proceed with the completion of a 12-month finding. We have
examined ongoing and future conservation efforts in our status review.
This included using our Policy for Evaluation of Conservation Efforts
When Making Listing Decisions (``PECE'') (68 FR 15100; March 28, 2003)
to evaluate conservation efforts by State and local governments and
other entities that have been planned but have not been implemented, or
have been implemented but have not yet demonstrated effectiveness, to
determine which such efforts met the standard in PECE for contributing
to our finding. Our analysis of the best available scientific data
revealed that the greater sage-grouse is not a threatened species, and
in making this finding it was not necessary to rely on the
contributions of any of the local, State, or other planned conservation
efforts that met the standard in PECE. A
[[Page 2245]]
summary of our process with regard to PECE is provided in the section
``Status Review Process,'' below.
Comment 2: Listing the sage-grouse could have a negative impact on
the conservation efforts being implemented by States for this species.
Response 2: We appreciate the fact that prior to acceptance of the
listing petitions, States within the range of the greater sage-grouse
are fully engaged in developing and implementing conservation efforts
for this species, and we encourage them to continue these efforts.
Conservation actions which have already been implemented have been
considered in this decision. However, our determination regarding
whether or not this species warrants listing under the Act must be
based on our assessment of population status and threats to the
species, the species' population status, and the status and trend of
the species' habitat as they are known at the time of the decision.
Comment 3: The facts do not support the need for listing this
species.
Response 3: The Service has considered all factors potentially
affecting the greater sage-grouse in our decision and agree that the
listing is not warranted. We have made our decision based on the best
available scientific and commercial data, as required by the Act.
Comment 4: In most western states, sage-grouse populations have
been fairly steady and in some cases, increasing over the past decade.
Response 4: The Service has considered population trends in all
States and Provinces, and across the entire range of the species in our
status review, including localized increases.
Comment 5: Locally managed efforts are best suited to preserve and
protect the greater sage-grouse.
Response 5: We acknowledge that local conservation efforts for this
species are important to long-term conservation, particularly given the
widespread distribution and the variety of habitats and threats.
However, most of these efforts have not yet been implemented, or have
not been demonstrated to be effective. Conservation actions that have
already been implemented and for which effectiveness is known have been
considered in this decision. Our determination of whether or not this
species warrants listing under the Act must be based on our assessment
of the threats to the species, the species' population status, and the
status and trend of the species' habitat as they are known at the time
of the decision. There is no one best strategy for sage-grouse
conservation and we encourage the continuation of all conservation
efforts to conserve the greater sage-grouse. The Service continues to
support the development of a Conservation Strategy for the Greater
Sage-grouse by Western Association of Fish and Wildlife Agencies
(WAFWA), and supports voluntary conservation as the most effective
method to protect species and their habitats.
Comment 6: The recovery process under the Endangered Species Act
has a very low success rate.
Response 6: Our decision regarding the greater sage-grouse is a
listing, not a recovery decision. Our determination regarding whether
or not this species warrants listing under the Act must be based on our
assessment of the threats to the species, the species' population
status, and the status and trend of the species' habitat as they are
known at the time of the decision, not its potential for recovery under
the Act. Therefore, this comment may not be considered in this finding.
Comment 7: If the greater sage-grouse is listed there will be a
reduction of freedom and private property rights and public land use,
and therefore a negative impact on the country. Listing the grouse will
also result in economic damage to many entities.
Response 7: Our decision regarding the greater sage-grouse is based
on the best available scientific and commercial data, as required by
the Act. Our determination regarding whether or not this species
warrants listing must be based on our assessment of the threats to the
species, the species' population status, and the status and trend of
the species' habitat as they are known at the time of the decision, not
the potential social or economic implications of listing. Therefore,
this comment may not be considered in this finding.
Comment 8: There will be a loss of management options for the
greater sage-grouse if this species is listed.
Response 8: We are not aware of any management options that are
beneficial to the greater sage-grouse that would need to be eliminated
if this species is listed under the Act-an action we believe to be not
warranted at this time.
Comment 9: Listing the greater sage-grouse will divide and polarize
local communities.
Response 9: Our decision regarding the greater sage-grouse is based
on the best available scientific and commercial data, as required by
the Act. Our determination regarding whether or not this species
warrants listing under the Act must be based on our assessment of the
threats to the species, the species' population status, and the status
and trend of the species' habitat as they are known at the time of the
decision, not the potential socio-political implications of listing.
Therefore, this comment may not be considered in this finding.
Comment 10: Listing the greater sage-grouse will increase the
workload for the U.S. Fish and Wildlife Service.
Response 10: Our decision regarding the greater sage-grouse is
based on the best available scientific and commercial data, as required
by the Act. Our determination regarding whether or not this species
warrants listing under the Act must be based on our assessment of the
threats to the species, the species' population status, and the status
and trend of the species' habitat as they are known at the time of the
decision, not the potential increase in workload for the Service.
Therefore, this comment may not be considered in this finding.
Comment 11: Listing the greater sage-grouse will result in Federal
budget limitations for other Federal agencies and projects.
Response 11: Our decision regarding the greater sage-grouse is
based on the best available scientific and commercial data, as required
by the Act. Our determination regarding whether or not this species
warrants listing under the Act must be based on our assessment of the
threats to the species, the species' population status, and the status
and trend of the species' habitat as they are known at the time of the
decision, not the potential implications for the Federal budget of
listing. Therefore, this comment may not be considered in this finding.
Comment 12: Conservation planning efforts and current Federal
agency actions are sufficient to conserve the greater sage-grouse.
Response 12: We acknowledge that many Federal agencies are
implementing conservation measures for the greater sage-grouse, and
that several conservation efforts for this species are underway.
Current federal conservation efforts have been reviewed and considered
in our analysis. We evaluated planned conservation efforts under PECE
(see Response 1); most of the planned conservation efforts for the
greater sage-grouse have not yet been implemented. However, because our
analysis of the best available scientific and commercial data revealed
that the greater sage-grouse is not warranted for listing under the
ESA, it was not necessary to evaluate whether the planned conservation
efforts that met PECE reduced the threats to the species.
Comment 13: The petition was subjected to an independent analysis
and serious problems were found with the science.
[[Page 2246]]
Response 13: Our 90-day finding was based on the determination that
the three petitions submitted met the ``substantial information''
threshold as defined under section 4(b)(3)(A) of the Act. At the time
of the 90-day finding, we did acknowledge that two of the three
petitions contained some misstatements (69 FR 21484). However, the
petitions were only one information source of many we used in our
review for the 90-day finding. For the current 12-month finding, we
conducted an exhaustive review of the scientific literature, and
included State, industry, and Federal agency data. This finding does
not rely on the petitions, but rather the best scientific and
commercial data available, as required by the Act.
Comment 14: The Western Governor's Association report provides
additional information which should be considered.
Response 14: The Western Governor's Association report was
considered in this finding.
Comment 15: Many private sector groups are taking steps to protect
sage-grouse habitat.
Response 15: We acknowledge that local conservation efforts for
this species are important to long-term conservation and strongly
support the continuation of these efforts. Most of the planned
conservation efforts for the greater sage-grouse have not yet been
implemented. As explained above, in making this finding it was not
necessary to rely on the contributions of any of the local, State, or
other planned conservation efforts that met the standard in PECE (see
Response 1).
Comment 16: Scientific reports detailing the sage-grouse's decline
consistently declare more work is necessary to adequately assess the
status of sage-grouse populations.
Response 16: We agree that additional information on populations
would be useful. However, as required by the Act, the Service must use
the best scientific and commercial information available when making a
12-month finding. The law does not provide a mechanism for the Service
to improve the available information.
Comment 17: Hunting is allowed in most states and provides a
benefit to hunters and state wildlife programs without a negative
impact on sage-grouse populations.
Response 17: At this time, it is unclear what area-specific impacts
sage-grouse hunting has on sage-grouse populations. Most States are
currently managing their populations in conformance with the WAFWA
guidelines, which contain the most up-to-date guidelines for sage-
grouse management. Our review indicated that regulated hunting of sage-
grouse does not pose a threat that would lead to the likely
endangerment of the species in the foreseeable future.
Comment 18: Now that there is a coordinated effort to further
protect the species, there is no reason to suspect that this progress
will not continue.
Response 18: We acknowledge that many Federal, State, and local
working groups are implementing protective measures for the greater
sage-grouse, and that several conservation efforts for this species are
underway, have been planned, or are in the process of being planned.
Most of the planned conservation efforts for the greater sage-grouse
have not yet been implemented. As explained above, in making this
finding it was not necessary to rely on the contributions of any of the
local, State, or other planned conservation efforts that met the
standard in PECE (see Response 1). We strongly encourage continued
efforts to preserve and protect the greater sage-grouse and its
habitat.
Comment 19: The Conservation Assessment of Greater Sage-grouse and
Sagebrush Habitats provides additional information which should be
considered.
Response 19: The Conservation Assessment of Greater Sage-grouse and
Sagebrush Habitats report was considered in this finding.
Comment 20: The worst possible outcome is to list the sage-grouse.
Response 20: Our determination of whether or not this species
warrants listing under the Act must be based on our assessment of the
threats to the species, the species' population status, and the status
and trend of the species' habitat as they are known at the time of the
decision. We strongly encourage all efforts to conserve the greater
sage-grouse and its habitat.
Comment 21: Predators are causing the decline of sage-grouse.
Response 21: We have considered the effects of predators and
predator control in our sage-grouse analysis.
Comment 22: We need to consider the effects of hunting on sage-
grouse.
Response 22: We have considered the effects of hunting in our sage-
grouse analysis.
Comment 23: Sage-grouse are doing well in some areas and therefore,
they should not be listed in those areas. Also, the Service should
consider the need to list sage-grouse on a state-by-state basis.
Response 23: The petitions requested that we determine if the
species needed to be listed across its entire range. Therefore, we have
to consider the sage-grouse population range-wide. Additionally, our
Policy Regarding the Recognition of Distinct Vertebrate Populations (61
FR 4722) requires that in order to consider separate populations within
a species for listing under the Act, such populations must (1) be
discrete in relation to the remainder of the species to which it
belongs, and (2) have biological and ecological significance for the
taxon. We have received no information that suggests any population of
the greater sage-grouse is isolated from conspecific populations, with
the exception of the Columbia Basin population in central Washington.
As described above, we previously determined that a proposal to list
the Columbia Basin distinct population segment is warranted but
precluded by other higher priority listing actions (66 FR 22984), and
in the near future we will reevaluate that determination to consider
new information, including (but not limited to) information available
as a result of this status review and finding on petitions to list the
greater sage-grouse.
Comment 24: Drought and other weather conditions have had a major
effect on sage-grouse populations.
Response 24: We acknowledge that drought and other weather
conditions are a natural occurrence in the west and we have considered
the effects of drought in our sage-grouse analysis.
Comment 25: It was interesting to see flocks of dozens of grouse
near fences, since conventional wisdom sees fences as perches for
raptors and hence areas of avoidance for raptor-wary grouse.
Response 25: We acknowledge that raptors do use fences as perch
sites. Sage-grouse tend to avoid perch sites like fences but threats of
raptors do not totally exclude sage-grouse use of habitat near fences.
Comment 26: The size of sage-grouse populations can be affected by
habitat condition.
Response 26: We acknowledge that habitat conditions can affect
local sage-grouse numbers. We have considered this information in the
finding.
Comment 27: Disease is a natural event that may be negatively
affecting sage-grouse.
Response 27: We have considered the effects of disease on greater
sage-grouse in this finding. As identified in the Act, it is one of the
threat factors we are required to consider in our status review.
Comment 28: Listing the greater sage-grouse will remove the
flexibility of local planning efforts.
Response 28: We recognize that listing may affect local planning
efforts, due to its effect on voluntary conservation efforts. However,
we may not consider those effects under this status review.
[[Page 2247]]
Comment 29: Maintaining and improving habitat is the answer to
increasing sage-grouse numbers.
Response 29: We concur that maintaining habitat is important for
the long-term conservation of the greater sage-grouse. We strongly
encourage efforts to conserve sage-grouse and sagebrush habitat.
Comment 30: Greater sage-grouse numbers and distribution have
significantly declined since 1900.
Response 30: The information pertaining to the status and
distribution of the greater sage-grouse has been reviewed and
incorporated in our analysis. Sage-grouse abundance has been
scientifically documented as declining since the 1950s, but the rate of
decline has decreased since the 1980s and in some places has
stabilized, or even increased.
Comment 31: Destructive land use practices and management on public
and private lands are negatively affecting the greater sage-grouse.
Response 31: We have considered the effects of various uses of
private and public lands on the status of the greater sage-grouse in
this finding.
Comment 32: Negative impacts to the greater sage-grouse continue
irrespective of efforts by State and local working groups.
Response 32: Most State and local working group conservation
efforts for the greater sage-grouse have not yet been implemented, and
the certainty of implementation and effectiveness of such efforts is
unclear. However, we have considered all conservation efforts which
have been implemented and shown to be effective. As explained above, in
making this finding it was not necessary to rely on the contributions
of any of the local, state, or other planned conservation efforts that
met the standard in PECE (see Response 1).
Comment 33: Listing the sage-grouse would affect much-needed land
management reform.
Response 33: Our decision regarding the greater sage-grouse is
based on the best available scientific and commercial data, as required
by the Act. Our determination regarding whether or not this species
warrants listing under the Act must be based on our assessment of the
threats to the species, the species' population status, and the status
and trend of the species' habitat as they are known at the time of the
decision, not the potential land management implications of listing.
Therefore, this comment may not be considered in this finding.
Comment 34: The ESA requires that listing decisions be based solely
on the best science and biological information about the species and
its habitats.
Response 34: Our decision regarding the greater sage-grouse is
based on the best available scientific and commercial data, as required
by the Act.
Comment 35: Meaningful regulatory mechanisms are non-existent and
existing management is inadequate to conserve the bird.
Response 35: We have considered existing regulatory mechanisms and
management activities in this finding.
Comment 36: Only listing the greater sage-grouse under the
Endangered Species Act will save the birds and its habitat.
Response 36: Our determination of whether or not this species
warrants listing under the Act must be based on our assessment of the
threats to the species, the species' population status, and the status
and trend of the species' habitat as they are known at the time of the
decision. We strongly encourage all efforts to conserve the greater
sage-grouse and its habitat.
Comment 37: Listing the greater sage-grouse would benefit a variety
of other sagebrush obligates and sagebrush-dependent species.
Response 37: This finding is for the greater sage-grouse only.
Therefore, we cannot consider the potential impact of listing the
greater sage-grouse on the status of other sagebrush-dependent species
in our decision.
Comment 38: The WAFWA Conservation Assessment is disturbing in that
its findings show a wide discrepancy in how States monitor greater
sage-grouse.
Response 38: The WAFWA Conservation Assessment represents one
component of the best available scientific and commercial data that we
used in our analysis, as required by the Act. The fact that the States
vary somewhat in how they conduct monitoring of this species was
considered in this finding.
Comment 39: The loss of small populations of sage-grouse increases
the species' risk of extinction when the species occurs primarily in
spread out, island-like patches of habitat.
Response 39: We have considered the effects of small population
sizes and isolated populations in our finding.
Comment 40: Current regulatory frameworks are sufficient to protect
the greater sage-grouse.
Response 40: We have considered existing regulatory mechanisms and
management activities in this finding and determined that existing
regulatory protections in combination with the existing threats do not
warrant listing the greater sage-grouse range-wide.
Comment 41: Grazing is good for sage-grouse. Improvements to
grazing practices have been positive for sage-grouse.
Response 41: We have considered all aspects of grazing impacts on
the greater sage-grouse in our finding.
Comment 42: Listing the greater sage-grouse will curtail energy
development.
Response 42: Our decision regarding the greater sage-grouse is
based on the best available scientific and commercial data, as required
by the Act. Our determination regarding whether or not this species
warrants listing under the Act must be based on our assessment of the
threats to the species, the species' population status, and the status
and trend of the species' habitat as they are known at the time of the
decision, not the potential land management implications of listing. We
did evaluate the threat of energy development to greater sage-grouse in
this finding.
Comment 43: ESA is prohibitively expensive to implement.
Response 43: Our decision regarding the greater sage-grouse is
based on the best available scientific and commercial data, as required
by the Act. Our determination regarding whether or not this species
warrants listing under the Act must be based on our assessment of the
threats to the species, the species' population status, and the status
and trend of the species' habitat as they are known at the time of the
decision, not the potential cost of listing. Therefore, this comment
may not be considered in this finding.
Comment 44: There is adequate funding available for future
conservation efforts for the greater sage-grouse.
Response 44: We evaluated the certainty of funding for future
conservation efforts as part of our evaluation of efforts that were
subject to PECE. We encourage the continued implementation of
conservation efforts for the greater sage-grouse.
Comment 45: We have additional information for your analysis.
Response 45: All relevant additional, new, or updated information
received in comments submitted was thoroughly considered in this 12-
month finding.
Comment 46: We have information regarding proposed actions for your
analysis.
Response 46: We have examined proposed actions, consistent with
PECE (68 FR 15100) in our status review. Our analysis of the best
available scientific and commercial data revealed that listing the
greater sage-grouse as threatened or endangered is not warranted, and
in making this finding it was not necessary to rely on the
[[Page 2248]]
contribution of any of the local, State, or other planned conservation
efforts that met the standard in PECE (see Response 1).
Comment 47: The Service's 90-day finding did not consider all
available information.
Response 47: For a 90-day finding, we are required to review the
information in the petition(s), our files, and any information provided
by States and Tribes. Based upon this information, the Service
determines whether there is substantial information indicating that
further review is necessary. We are required to consider the best
available scientific and commercial data in our 12-month status review.
This finding represents our conclusions based on that information.
Comment 48: Falconers take very few sage-grouse. They are a
preferred species for only one extremely specialized form of falconry.
Response 48: We have considered this information in our analysis.
Comment 49: If the Service determines that listing the sage-grouse
is appropriate, they will have to designate critical habitat.
Response 49: Our decision regarding the greater sage-grouse is
based on the best available scientific and commercial data, as required
by the Act. Our determination regarding whether or not this species
warrants listing under the Act must be based on our assessment of the
threats to the species, the species' population status, and the status
and trend of the species' habitat as they are known at the time of the
decision. We designate critical habitat for listed species as required
by the Act.
Comment 50: The Service must consider the status of the sage-grouse
across the entirety of its range.
Response 50: We have considered the status of the greater sage-
grouse across the entirety of its range, as petitioned.
Comment 51: We do not believe that the designation of the
Washington population of sage-grouse as a Distinct Population Segment
(DPS) is appropriate.
Response 51: This status review of the greater sage-grouse does not
address our prior finding with regard to the Columbia Basin distinct
population segment (DPS). New information which has become available
through this status review of the greater sage-grouse will be
considered when we re-evaluate the status of the Columbia Basin
population, either through an updated finding or in the next Candidate
Notice of Review.
Comment 52: Managing agencies lack Best Management Practices due to
the lack of support, manpower, and funding.
Response 52: We acknowledge that the extent of support, manpower,
and funding may influence some aspects of the implementation of Best
Management Practices (BMPs) for sage-grouse. As currently described,
most BMPs are very broadly stated mitigation measures that involve
incorporating project design features when various resource management
activities are planned, in order to reduce or avoid impacts to species.
Comment 53: Industry has implemented many mitigation and protection
measures for sage-grouse.
Response 53: We acknowledge that industries are implementing some
mitigation and protective measures for sage-grouse. We evaluated all
such information that was available to us. We strongly encourage the
continuation of all efforts to conserve the greater sage-grouse and its
habitat.
Comment 54: Listing the sage-grouse could have profound impacts on
a number of military facilities.
Response 54: Our decision regarding the greater sage-grouse is
based on the best available scientific and commercial data, as required
by the Act. Our determination regarding whether or not this species
warrants listing under the Act must be based on our assessment of the
threats to the species, the species' population status, and the status
and trend of the species' habitat as they are known at the time of the
decision, not the potential impact of listing on military facilities.
Therefore, this comment may not be considered in this finding.
Comment 55: Loss of habitat to cheatgrass and juniper invasion are
major threats to sage-grouse habitat. The technologies and know-how
exist to eliminate or reduce the cheatgrass and juniper invasion
trends.
Response 55: We acknowledge that cheatgrass and juniper invasions
are threats to sage-grouse habitats. Currently, technologies have been
developed or are being developed to treat problems of cheatgrass and
juniper invasions. Our review found mixed results in the current
technologies' ability to treat cheatgrass and juniper problems.
Comment 56: Historic declines and habitat loss are not relevant to
the current listing decision.
Response 56: Our decision regarding the greater sage-grouse is
based on the best available scientific and commercial data, as required
by the Act. Our determination regarding whether or not this species
warrants listing under the Act must be based on our assessment of the
threats to the species, the species' population status, and the status
and trend of the species' habitat as they are known at the time of the
decision, including information on historic declines and habitat loss
to the extent that they contribute to current threats.
Comment 57: There is no peer-reviewed science to support a listing.
Response 57: We have reviewed scientific, peer-reviewed literature
in our analysis, as well as commercial and unpublished data. The
cumulative review of this information was used to determine if the
greater sage-grouse warrants listing under the Endangered Species Act.
Comment 58: Most sage-grouse habitat loss due to agriculture (i.e.,
conversion to cropland, seeding to crested wheatgrass, etc.) has been
eliminated or greatly reduced. Large-scale conversions to agriculture
are decreasing.
Response 58: We acknowledge that there have been changes in the
rate of loss of sage-grouse habitat due to various agricultural
conversions. We have considered this information in our analysis.
Comment 59: The Service must consider all listing factors when
making a determination.
Response 59: Our determination regarding whether or not this
species warrants listing under the Act must be based on our assessment
of the threats to the species, the species' population status, and the
status and trend of the species' habitat as they are known at the time
of the decision. We consider the effects of all threats on the status
of the species when we make our determination.
Comment 60: Present habitat provides the necessary elements to
sustain a highly viable sage-grouse population.
Response 60: We have considered existing habitat conditions for the
greater sage-grouse throughout its range in this finding.
Comment 61: There is insufficient funding available to adequately
fund existing and proposed conservation plans for the greater sage-
grouse.
Response 61: We have examined ongoing and future conservation
efforts in our status review. We have examined proposed actions,
consistent with PECE (68 FR 15100), in our status review, and this
included consideration of funding, consistent with one of the criteria
in PECE. (See also Response 1, above).
Comment 62: Wildfire is a threat to sage-grouse habitat and can
result in habitat elimination across the species' range.
Response 62: We have considered the effects of wildfire on sage-
grouse habitat in this finding.
[[Page 2249]]
Information Quality Act
In addition to the comments received, two Information Quality Act
challenges were submitted. The challenge received from the Partnership
for the West was addressed through a response directly to that
organization. The second challenge from the Owyhee County Commissioners
(Idaho) primarily stated that we failed to conduct an exhaustive search
of all scientific literature, and other information in the completion
of our 90-day finding. Section 4(b)(3)(A) of the Act only requires that
the petitions present ``substantial scientific or commercial
information indicating that the petitioned action may be warranted.''
The Act does not require an exhaustive search of all available
information at that time. Other concerns identified in the Owyhee
County Commissioner's challenge are addressed in our comment responses
above, and an overall summary regarding the steps we have taken to
ensure conformance with our Information Quality Guidelines is provided
below.
The Service's Information Quality Guidelines define quality as an
encompassing term that includes utility, objectivity, and integrity.
Utility refers to the usefulness of the information to its intended
users, including the public. Objectivity includes disseminating
information in an accurate, clear, complete, and unbiased manner and
ensuring accurate, reliable, and unbiased information. If data and
analytic results have been subjected to formal, independent, external
peer review, we generally will presume that the information is of
acceptable objectivity. Integrity refers to the security of
information--protection of the information from unauthorized access or
revision, to ensure that the information is not compromised through
corruption or falsification.
The Service conducted a thorough pre-dissemination review of the
data it is relying on to make this 12-month finding. In particular, the
Service used the information in the WAWFA Conservation Assessment,
which is a peer-reviewed science document. The WAWFA assessment was
based on data provided by the states, provinces, land management
agencies, as well as data in published, peer-reviewed manuscripts and
other verified sources available to the authors of the assessment. The
draft final assessment was reviewed by State agency wildlife biologists
to ensure that data submitted by each State were presented accurately
and completely. The assessment also was peer reviewed by an independent
group of scientists selected by the Ecological Society of America.
These reviewers were experts from academia, government, and non-
governmental organizations, and included researchers as well as
wildlife managers.
The WAWFA Conservation Assessment assembles in one place almost all
of the available pertinent data that addresses the current biological
and ecological condition of the sage-grouse and its habitat. This
compilation of material allows the public to see a large body of
information all in one document, making the information more useful
than the many separate sources of information would be. Since the
document has been subject to an independent, external peer review, the
Service believes it is of acceptable objectivity. For these reasons the
Service believes this information meets our Information Quality
Guidelines.
Status Review Process
Section 4(b)(1)(A) of the Act requires us to consider the best
scientific and commercial data available as well as efforts being made
by States or other entities to protect a species when making a listing
decision. To meet this standard we systematically collected information
on the greater sage-grouse, its habitats, and environmental factors
affecting the species, from a wide array of sources. The scientific
literature on greater sage-grouse and sagebrush habitats is extensive.
In addition we received a substantial amount of unpublished information
from other Federal agencies, States, private industry and individuals.
We also solicited information on all Federal, State, or local
conservation efforts currently in operation or planned for either the
greater sage-grouse or its habitats.
The current distribution of greater sage-grouse and sagebrush
habitat encompasses parts of 11 states in the western United States and
2 Canadian provinces (Figure 1). This large geographical scale combined
with major ecological differences in sagebrush habitat and myriad of
activities occurring across this large area required that the Service
employ a structured analysis approach. Given the very large body of
information available to us for our decision, structuring our analysis
ensured we could explicitly assess the relative risk of changes
occurring across the range of the sage-grouse, and integrate those
individual assessments, be they regional or rangewide in nature, into
an estimate of the probability that sage-grouse would go extinct at
defined timeframes in the future. Using such extinction risk analysis
to frame listing decisions under the Act has been recommended (National
Research Council 1995), and was adopted by the Service as an important
component of a structured analysis of the status review of the greater
sage-grouse.
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As part of the structuring of this status review, the Service
compiled from the best scientific and commercial data available a
summary of the changes or impacts occurring to the sagebrush ecosystem
that could potentially affect the sage-grouse directly or indirectly.
This summary, or synthesis of biological information, was one of many
sources of information provided to a panel of seven experts, who,
through a two-day facilitated process discussed threats to the species
and each generated an estimate of extinction risk for the greater sage-
grouse at different timeframes in the future. This information and all
other available information were then considered by Service biologists
and managers to frame a listing recommendation, and ultimately the
decision reported in this finding.
Expert panels are not a required component of structured analysis
but are used to help inform decision makers when there is uncertainty
(National Research Council 1995). Typically, this uncertainty is due to
a lack of information. While the scientific information on greater
sage-grouse and their habitats is extensive, substantial gaps and
uncertainty remain in the scientific community's knowledge of all the
factors that may affect sage-grouse populations across such a wide
geographical range encompassing major ecological differences in
sagebrush habitats. Further, scientific knowledge of how the species
may respond to those factors over time is incomplete. For these
reasons, we requested input from scientific experts outside the Service
to help us make a reasonable projection of the species' potential
extinction risk. The panel consisted of experts in sage-grouse biology
and ecology, sagebrush community ecology, and range ecology and
management.
The organization of this finding reflects this basic approach. We
first describe in more detail the structured process; present a summary
of the threats to the species organized according to the 5 listing
factors in the Act; then we present results from the facilitated expert
panel process, including estimates of extinction risk; and finally
present how a team of Service biologists and managers interpreted the
extinction risk analysis, the threat ranking of the expert panelists,
and other available information in the context of a listing decision
under the Act. In order to ensure that the process we used to reach our
finding is transparent, discussion of the biological significance of
each threat listed under the 5 listing factors, and the geographical
scale at which they affect sage-grouse is based on results of the
expert panel and decision support team process. A thorough description
of this process and its results is presented later in the finding along
with the decision support team's evaluation of the threats in the
context of a listing decision under the Act. However, we felt it was
important to include a brief discussion of the spatial and biological
significance of each threat as they are presented by listing factor.
Following compilation of the best available scientific and
commercial information, which is summarized in other sections of this
finding and available in full in our administrative record, we
conducted three phases of information synthesis and evaluation. First,
the information on individual planned conservation efforts was
evaluated under PECE to determine which efforts met the following
standard in PECE: ``To consider that a formalized conservation
effort(s) contributes to forming a basis for not listing a species or
listing a species as threatened rather than endangered, we must find
that the conservation effort is sufficiently certain to be implemented
and effective so as to have contributed to the elimination or adequate
reduction of one or more threats to the species identified through the
section 4(a)(1) analysis'' (see 68 FR 15115). Second, we completed a
structured analysis of greater sage-grouse extinction risk including
the evaluation of all factors that may be contributing to the species'
population trends and the likelihood of the species' extinction at
various timeframes into the future. Finally, we evaluated whether the
available information on status, trends, ongoing conservation efforts,
and potential extinction risk indicate that the greater sage-grouse
should be listed as a threatened or endangered species. We further
structured these three phases by differentiating two distinct stages of
the status review: (1) A risk analysis phase which consisted of
compiling biological information, conducting the PECE analysis, and
assessing the risk of extinction of greater sage-grouse, and (2) a risk
management phase where a decision support team of senior Service
biologists and managers evaluated whether or not the potential threats
identified as part of our section 4(a)(1) analysis, and summarized in
this finding, are significant enough to qualify the greater sage-grouse
as a threatened or endangered species under the Act.
For the PECE analysis, we received and reviewed 27 plans, or
conservation strategies, outlining more than 300 individual efforts.
Most of the plans were from States, but we also received information
from the Department of Energy (DOE), Bureau of Land Management (BLM),
U.S. Forest Service (USFS), Department of Defense (DOD), Natural
Resources Conservation Service (NRCS), Western Governor's Association
(WGA), and the North American Grouse Partnership (NAGP).
Each effort within each plan was evaluated under PECE, which
provides a framework and criteria for evaluating conservation efforts
that have not yet been implemented or have not yet demonstrated whether
they are effective at the time of a listing decision. Recognizing that
the certainty of implementation and effectiveness of various efforts
within a conservation plan, strategy, or agreement may vary, PECE
requires that we evaluate each effort individually, and the policy
provides criteria to direct our analysis. PECE specifies that ``Those
conservation efforts that are not sufficiently certain to be
implemented and effective cannot contribute to a determination that
listing is unnecessary or a determination to list as threatened rather
than endangered'' (see 68 FR 15115). As described above, when
determining whether or not a species warrants listing, with regard to
conservation efforts that are subject to PECE we may only consider
those efforts that we are sufficiently certain to be implemented and
effective so as to have contributed to the elimination or reduction of
one or more threats to the species. Using the criteria provided in
PECE, we determined that 20 of the individual efforts we evaluated met
the standard for being sufficiently certain to be implemented and
effective in reducing threats. Hence, we included those 20 efforts in
the information used for the extinction risk evaluation.
The expert panelists participated together in a series of
facilitated exercises and discussions addressing first the species'
inherent biological vulnerability and resilience, then the potential,
relative influence of extrinsic or environmental factors on
populations, and finally the experts' projections of extinction risk at
different geographical scales both with and without the 20 planned
conservation efforts from the PECE analysis. The Service would only
consider the effect of the conservation efforts that met PECE in our
decision if our review of the best available scientific and commercial
data revealed that listing the greater sage-grouse under the Act was
warranted. The experts participated only in the assessment of
biological and environmental factors and related extinction risk
without any consideration or discussion of the petition or regulatory
classification of
[[Page 2252]]
the species. Structuring of the assessment facilitated thorough and
careful deliberation by the experts and observing Service biologists
and managers on the decision support team, including clarification of
what information was critical to forming the experts' views of, where
knowledge gaps and areas of uncertainty exist, and confidence experts
felt in the biological judgments they expressed. Structuring also
facilitated independent contributions from the experts.
In the final status review stage, following the compilation of
biological information, PECE analysis of conservation efforts, and the
facilitated extinction risk assessment by the expert panel, Service
biologists and managers met and conducted a separate facilitated
process to assess whether or not the threats to the greater sage-grouse
described in this finding were significant enough at this time to meet
the definition of a threatened or endangered species under the Act.
Specific results from both the facilitated risk analysis stage of the
status review and the facilitated risk management stage of the status
review are presented later in the finding to clarify how the Service
reached its decision. The Service's finding considered all of the
available information on record.
Species Information
The sage-grouse is the largest North American grouse species. Adult
males range in length from 66 to 76 centimeters (cm) (26 to 30 inches
(in)) and weigh between 2 and 3 kilograms (kg) (4 and 7 pounds (lb)).
Adult females range in length from 48 to 58 cm (19 to 23 in) and weigh
between 1 and 2 kg (2 and 4 lb). Males and females have dark grayish-
brown body plumage with many small gray and white speckles, fleshy
yellow combs over the eyes, long pointed tails, and dark green toes.
Males also have blackish chin and throat feathers, conspicuous
phylloplumes (specialized erectile feathers) at the back of the head
and neck, and white feathers forming a ruff around the neck and upper
belly. During breeding displays, males exhibit olive-green apteria
(fleshy bare patches of skin) on their breasts (Schroeder et al. 1999).
In 2000, the species was separated into 2 distinct species, the
greater sage-grouse (C. urophasianus) and the Gunnison sage-grouse (C.
minimus) based on genetic, morphological and behavioral differences
(Young et al. 2000). This finding only addresses the greater sage-
grouse.
Although the American Ornithological Union (AOU) recognizes two
subspecies of the greater sage-grouse, the eastern (C. u. urophasianus)
and western (C. u. phaios), based on research by Aldrich (1946), recent
genetic analyses do not support this delineation (Benedict et al. 2003;
Oyler-McCance et al. in press). There are no known delimiting
differences in habitat use, natural history, or behavior between the
two subspecies. Therefore, the Service no longer acknowledges the
subspecies designation (68 FR 6500; February 7, 2003; 69 FR 933;
January 7, 2004).
Sage-grouse depend on a variety of shrub-steppe habitats throughout
their life cycle, and are considered obligate users of several species
of sagebrush (e.g., Wyoming big sagebrush (Artemisia tridentata
wyomingensis), mountain big sagebrush (A. t. vaseyana), and basin big
sagebrush (A. t. tridentata) (Patterson 1952; Braun et al. 1976;
Connelly et al. 2000a; Connelly et al. 2004)). Sage-grouse also use
other sagebrush species such as low sagebrush (A. arbuscula), black
sagebrush (A. nova), fringed sagebrush (A. frigida) and silver
sagebrush (A. cana) (Schroeder et al. 1999; Connelly et al. 2004).
Thus, sage-grouse distribution is strongly correlated with the
distribution of sagebrush habitats (Schroeder et al. 2004). While sage-
grouse are dependent on large, interconnected expanses of sagebrush
(Patterson 1952; Connelly et al. 2004), information is not available
regarding minimum sagebrush patch sizes required to support populations
of sage-grouse. Sage-grouse exhibit strong site fidelity (loyalty to a
particular area) for breeding and nesting areas (Connelly et al. 2004).
During the spring breeding season, male sage-grouse gather together
to perform courtship displays on display areas called leks. Areas of
bare soil, short-grass steppe, windswept ridges, exposed knolls, or
other relatively open sites may serve as leks (Patterson 1952; Connelly
et al. 2004 and references therein). Leks are often surrounded by
denser shrub-steppe cover, which is used for escape, thermal and
feeding cover. Leks can be formed opportunistically at any appropriate
site within or adjacent to nesting habitat (Connelly et al. 2000a), and
therefore lek habitat availability is not considered to be a limiting
factor for sage-grouse (Schroeder 1997). Leks range in size from less
than 0.04 hectare (ha) (0.1 acre (ac)) to over 36 ha (90 ac) (Connelly
et al. 2004) and can host from several to hundreds of males (Johnsgard
2002). Males defend individual territories within leks and perform
elaborate displays with their specialized plumage and vocalizations to
attract females for mating. A relatively small number of dominant males
accounts for the majority of breeding on each lek (Schroeder et al.
1999).
Sage-grouse typically select nest sites under sagebrush cover,
although other shrub or bunchgrass species are sometimes used (Klebenow
1969; Connelly et al. 2000a; Connelly et al. 2004). The sagebrush
understory of productive nesting areas contains native grasses and
forbs, with horizontal and vertical structural diversity that provides
an insect prey base, herbaceous forage for pre-laying and nesting hens,
and cover for the hen while she is incubating (Gregg 1991; Schroeder et
al. 1999; Connelly et al. 2000a; Connelly et al. 2004). Shrub canopy
and grass cover provide concealment for sage-grouse nests and young,
and are critical for reproductive success (Barnett and Crawford 1994;
Gregg et al. 1994; DeLong et al.1995; Connelly et al. 2004). Vegetation
characteristics of nest sites, as reported in the scientific literature
have been summarized by Connelly et al. (2000a). Females have been
documented to travel more than 20 km (12.5 mi) to their nest site after
mating (Connelly et al. 2000a), but distances between a nest site and
the lek on which breeding occurred is variable (Connelly et al. 2004).
While earlier studies indicated that most hens nest within 3.2 km (2
mi) of a lek, more recent research indicates that many hens actually
move much further from leks to nest based on nesting habitat quality
(Connelly et al. 2004). Research by Bradbury et al. (1989) and Wakkinen
et al. (1992) demonstrated that nest sites are selected independent of
lek locations.
Sage-grouse clutch size ranges from 6 to 13 eggs (Schroeder et al.
2000). Nest success (one or more eggs hatching from a nest), as
reported in the scientific literature, ranges from 15 to 86 percent of
initiated nests (Schroeder et al. 1999), and is typically lower than
other prairie grouse species (Connelly et al. 2000a) and therefore
indicative of a lower intrinsic (potential) population growth rate than
in most game bird species (Schroeder et al. 1999). Renesting rates
following nest loss range from 5 to 41 percent (Schroeder 1997).
Hens rear their broods in the vicinity of the nest site for the
first 2 to 3 weeks following hatching (Connelly et al. 2004). Forbs and
insects are essential nutritional components for chicks (Klebenow and
Gray 1968; Johnson and Boyce 1991; Connelly et al. 2004). Therefore,
early brood-rearing habitat must provide adequate cover adjacent to
areas rich in forbs and insects to assure chick survival during this
period (Connelly et al. 2004).
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Sage-grouse move from sagebrush uplands to more mesic areas during
the late brood-rearing period (3 weeks post-hatch) in response to
summer desiccation of herbaceous vegetation (Connelly et al. 2000a).
Summer use areas can include sagebrush habitats as well as riparian
areas, wet meadows and alfalfa fields (Schroeder et al. 1999). These
areas provide an abundance of forbs and insects for both hens and
chicks (Schroeder et al. 1999; Connelly et al. 2000a). Sage-grouse will
use free water although they do not require it since they obtain their
water needs from the food they eat. However, natural water bodies and
reservoirs can provide mesic areas for succulent forb and insect
production, thereby attracting sage-grouse hens with broods (Connelly
et al. 2004). Broodless hens and cocks will also use more mesic areas
in close proximity to sagebrush cover during the late summer (Connelly
et al. 2004).
As vegetation continues to desiccate through the late summer and
fall, sage-grouse shift their diet entirely to sagebrush (Schroeder et
al. 1999). Sage-grouse depend entirely on sagebrush throughout the
winter for both food and cover. Sagebrush stand selection is influenced
by snow depth (Patterson 1952; Connelly 1982 as cited in Connelly et
al. 2000a), and, in some areas, topography (Beck 1977; Crawford et al.
2004).
Many populations of sage-grouse migrate between seasonal ranges in
response to habitat distribution (Connelly et al. 2004). Migration can
occur between winter and breeding/summer areas, between breeding,
summer and winter areas, or not at all. Migration distances of up to
161 kilometers (km) (100 mi) have been recorded (Patterson 1952);
however, average individual movements are generally less than 34 km (21
mi) (Schroeder et al. 1999). Migration distances for female sage-grouse
generally are less than for males (Connelly et al. 2004). Almost no
information is available regarding the distribution and characteristics
of migration corridors for sage-grouse (Connelly et al. 2004). Sage-
grouse dispersal (permanent moves to other areas) is poorly understood
(Connelly et al. 2004) and appears to be sporadic (Dunn and Braun
1986).
Sage-grouse typically live between 1 and 4 years, but individuals
up to 10 years of age have been recorded in the wild (Schroeder et al.
1999). Juvenile survival (from hatch to first breeding season) is
affected by food availability, habitat quality, harvest, and weather.
Documented juvenile survival rates have ranged between 7 and 60 percent
in a review of many field studies (Crawford et al. 2004). The average
annual survival rate for male sage-grouse (all ages combined)
documented in various studies ranged from 38 to 60 percent (Schroeder
et al. 1999), and for females 55 to 75 percent (Schroeder 1997;
Schroeder et al. 1999). Survival rates are high compared with other
prairie grouse species (Schroeder et al. 1999). Higher female survival
rates account for a female-biased sex ratio in adult birds (Schroeder
1997; Johnsgard 2002). Although seasonal patterns of mortality have not
been thoroughly examined, over-winter mortality is low (Connelly et al.
2004).
Range and Distribution
Prior to settlement of the western North America by European
immigrants in the 19th century, greater sage-grouse lived in 13 States
and 3 Canadian provinces--Washington, Oregon, California, Nevada,
Idaho, Montana, Wyoming, Colorado, Utah, South Dakota, North Dakota,
Nebraska, Arizona, British Columbia, Alberta, and Saskatchewan
(Schroeder et al. 1999; Young et al. 2000; Schroeder et al. 2004).
Sagebrush habitats that potentially supported sage-grouse occurred over
approximately 1,200,483 km2 (463,509 mi2) before 1800 (Schroeder et al.
2004). Currently, sage-grouse occur in 11 States and 2 Canadian
provinces, ranging from extreme southeastern Alberta and southwestern
Saskatchewan, south to western Colorado, and west to eastern
California, Oregon, and Washington. Sage-grouse have been extirpated
from Nebraska, British Columbia, and possibly Arizona (Schroeder et al.
1999; Young et al. 2000; Schroeder et al. 2004). Current distribution
of the greater sage-grouse is estimated at 668,412 km2 (258,075 mi2) or
56 percent of the potential pre-settlement distribution (Schroeder et
al. 2004; Connelly et al. 2004). The vast majority of the current
distribution of the greater sage-grouse is within the United States.
Estimates of current total sage-grouse abundance vary, but are all
much lower than the historical estimates of a million or more birds.
Braun (1998) estimated that the 1998 rangewide spring population
numbered about 142,000 sage-grouse, derived from numbers of males
counted on leks. The Service estimated the rangewide abundance of sage-
grouse in 2000 was at least 100,000 (taken from Braun (1998)) and up to
500,000 birds (based on harvest data from Idaho, Montana, Oregon and
Wyoming, with the assumption that 10 percent of the population is
typically harvested) (65 FR 51578). Survey intensity has increased
markedly in recent years and, in 2003, more than 50,000 males were
counted on leks (Connelly et al. 2004). Therefore, Connelly et al.
(2004) concluded that rangewide population numbers in 2003 were likely
much greater than the 142,000 estimated in 1998 but was unable to
generate a rangewide population estimate. Sampling methods used across
the range of the sage-grouse differ, resulting in too much variation to
reliably estimate sage-grouse numbers (Connelly et al. 2004). Since
neither pre-settlement nor current numbers of sage-grouse are known
with complete precision, the actual rate and extent of decline cannot
be exactly estimated.
Periods of historical decline in sage-grouse abundance occurred
from the late 1800s to the early-1900s (Hornaday 1916; Crawford 1982;
Drut 1994; Washington Department of Fish and Wildlife 1995; Braun 1998;
Schroeder et al. 1999). Other declines in sage-grouse populatio