Endangered and Threatened Wildlife and Plants; Endangered Species Status for Franklin's Bumble Bee, 47221-47238 [2021-17832]

Agencies

• Fish and Wildlife Service
• DEPARTMENT OF THE INTERIOR

[Federal Register Volume 86, Number 161 (Tuesday, August 24, 2021)]
[Rules and Regulations]
[Pages 47221-47238]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2021-17832]


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DEPARTMENT OF THE INTERIOR

Fish and Wildlife Service

50 CFR Part 17

[Docket No. FWS-R1-ES-2018-0044; FF09E21000 FXES11110900000 212]
RIN 1018-BD25


Endangered and Threatened Wildlife and Plants; Endangered Species 
Status for Franklin's Bumble Bee

AGENCY: Fish and Wildlife Service, Interior.

ACTION: Final rule.

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SUMMARY: We, the U.S. Fish and Wildlife Service (Service), are listing 
the Franklin's bumble bee (Bombus franklini), an invertebrate species 
from Douglas, Jackson, and Josephine Counties in Oregon, and Siskiyou 
and Trinity Counties in California, as an endangered species under the 
Endangered Species Act of 1973, as amended (Act). This rule adds this 
species to the Federal List of Endangered and Threatened Wildlife and 
applies the protections of the Act to this species. We are not 
designating critical habitat for the Franklin's bumble bee because we 
determined that such a designation would not be beneficial to the 
species.

DATES: This rule is effective September 23, 2021.

ADDRESSES: This final rule and supporting documents are available on 
the internet at https://www.regulations.gov in Docket No. FWS-R1-ES-
2018-0044, or at https://ecos.fws.gov.

FOR FURTHER INFORMATION CONTACT: Paul Henson, Field Supervisor, U.S. 
Fish and Wildlife Service, Oregon Fish and Wildlife Office, 2600 SE 
98th Ave., Suite 100, Portland, OR 97266; telephone 503-231-6179. 
Persons who use a telecommunications device for the deaf (TDD) may call 
the Federal Relay Service at 800-877-8339.

SUPPLEMENTARY INFORMATION:

Executive Summary

    Why we need to publish a rule. Under the Act, if we determine that 
a species may be an endangered or threatened species throughout all or 
a significant portion of its range, we are required to promptly publish 
a proposal in the Federal Register and make a determination on our 
proposal within 1 year. To the maximum extent prudent and determinable, 
we must designate critical habitat for any species that we determine to 
be an endangered or threatened species under the Act. Listing a species 
as an endangered or threatened species and designation of critical 
habitat can only be completed by issuing a rule.
    What this document does. This rule lists Franklin's bumble bee 
(Bombus franklini) as an endangered species under the Act. We are not 
designating critical habitat because we determined that a designation 
is not prudent for this species.
    The basis for our action. Under the Act, we may determine that a 
species is an endangered or threatened species because of any of five 
factors: (A) The present or threatened destruction, modification, or 
curtailment of its habitat or range; (B) overutilization for 
commercial, recreational, scientific, or educational purposes; (C) 
disease or predation; (D) the inadequacy of existing regulatory 
mechanisms; or (E) other natural or manmade factors affecting its 
continued existence. We have determined that Franklin's bumble bee 
meets the definition of an endangered species and therefore warrants 
protection under the Act. The threats to the species of pathogens, 
pesticides, and small population size are ongoing and rangewide; they 
are likely to continue to act individually and in combination to 
decrease the viability of the Franklin's bumble bee. The risk of 
extinction is high, the suspected threats to the species persist, and 
the number of remaining Franklin's bumble bees is presumably very 
small, as the species has not been observed since 2006. Existing 
regulatory mechanisms or conservation measures in place do not 
appreciably reduce or ameliorate the existing threats to the

[[Page 47222]]

species, as evidenced by the species' acute and rangewide decline. 
Therefore, on the basis of the best available scientific and commercial 
information, we are listing the Franklin's bumble bee as endangered in 
accordance with sections 3(6) and 4(a)(1) of the Act.
    Section 4(a)(3) of the Act requires the Secretary of the Interior 
(Secretary) to designate critical habitat concurrent with listing to 
the maximum extent prudent and determinable. Section 3(5)(A) of the Act 
defines critical habitat as (i) the specific areas within the 
geographical area occupied by the species, at the time it is listed, on 
which are found those physical or biological features (I) essential to 
the conservation of the species and (II) which may require special 
management considerations or protections; and (ii) specific areas 
outside the geographical area occupied by the species at the time it is 
listed, upon a determination by the Secretary that such areas are 
essential for the conservation of the species. Section 4(b)(2) of the 
Act states that the Secretary must make the designation on the basis of 
the best scientific data available and after taking into consideration 
the economic impact, the impact on national security, and any other 
relevant impacts of specifying any particular area as critical habitat. 
Because the present or threatened destruction, modification, or 
curtailment of habitat is not a threat to the Franklin's bumble bee 
(disease and other manmade factors are likely the primary threat to the 
species within its habitat), in accordance with 50 CFR 424.12(a)(1), we 
determine that designating critical habitat is not prudent for 
Franklin's bumble bee.
    Peer review and public comment. We sought the expert opinions of 10 
appropriate and independent specialists regarding the species status 
assessment report. We received responses from 5 specialists, which 
informed our determination. We also considered all 53 comments and 
information received from the public during the comment period.

Previous Federal Actions

    Please refer to the proposed rule (84 FR 40006) for Franklin's 
bumble bee published on August 13, 2019, for a detailed description of 
previous Federal actions concerning this species.
    On August 27, 2019, the Service published a final rule (84 FR 
45020) revising the regulations at 50 CFR part 424 for listing species 
and designating critical habitat. However, the revisions apply only to 
relevant rulemakings for which the proposed rule is published after 
September 26, 2019, the effective date of the final rule. Thus, the 
prior version of the regulations at 50 CFR part 424 continues to apply 
to any rulemakings for which a proposed rule was published before 
September 26, 2019, including this final rule for Franklin's bumble 
bee.

Summary of Changes From the Proposed Rule

    We considered all comments and information we received during the 
comment period for the proposed rule to list the Franklin's bumble bee 
(84 FR 40006; August 13, 2019). Based on these comments and additional 
internal review, we made the following changes from the proposed rule 
in this final rule:
     Added to this rule and the SSA report additional climate 
change information and analysis, as well as discussion on the likely 
effects of other potential threats in the future;
     Updated this rule and the SSA report with information from 
the 2019 survey season;
     Corrected a mathematical error in our presentation of 
neonicotinoid pesticide applications in the historical range of the 
species in this rule and in the SSA report;
     Added information from the SSA report to this rule 
regarding nectaring behavior, as well as the commercialization of 
bumble bees for pollination;
     Updated information in this rule on pesticide regulation 
on National Wildlife Refuge System lands;
     Added further detail in the rule on Tribal notifications;
     Added several citations and clarifications to the rule to 
further support content; and
     Made minor editorial changes to the rule to improve 
readability.
    We carefully considered the additional information we received 
during the comment period, and while much of this information was 
helpful, it did not result in any further changes from our proposal to 
this final rule to list Franklin's bumble bee as endangered, nor did it 
result in a change to our determination that designation of critical 
habitat is not prudent at this time.

Supporting Documents

    A species status assessment (SSA) team prepared an SSA report for 
Franklin's bumble bee. The SSA team was composed of Service biologists, 
in consultation with other species experts. The SSA report represents a 
compilation of the best scientific and commercial data available 
concerning the status of the species, including the impacts of past, 
present, and future factors (both negative and beneficial) affecting 
the species.
    In accordance with our joint policy on peer review published in the 
Federal Register on July 1, 1994 (59 FR 34270), we sought the expert 
opinions of 10 appropriate and independent specialists regarding the 
scientific basis for this proposed rule, detailed in the Franklin's 
Bumble Bee Species Status Assessment report (SSA report) (Service 
2018a, entire). We received five reviews. The purpose of peer review is 
to ensure that our listing and critical habitat determinations are 
based on scientifically sound data, assumptions, and analyses. The peer 
reviewers have expertise in Franklin's bumble bee or Bombus biology and 
habitat, and their comments helped inform our determinations. We also 
invited comment on the SSA report from our partner agencies; the U.S. 
Forest Service, the Bureau of Land Management, and the Oregon 
Department of Agriculture provided us with comments. The comments from 
peer and partner reviews were carefully considered in the process of 
finalizing the SSA report that provided the scientific basis for both 
the proposed rule and this final rule. These comments, along with other 
public comments on our proposed rule, are available in the docket for 
this final rule (https://www.regulations.gov in Docket No. FWS-R1-ES-
2018-0044).

I. Final Listing Determination

Background

    A thorough review of the taxonomy, life history, and ecology of 
Franklin's bumble bee is presented in the SSA report (Service 2018a, 
entire) on https://www.regulations.gov under Docket No. FWS-R1-ES-2018-
0044. Franklin's bumble bee is thought to have the most limited 
distribution of all known North American bumble bee species (Plowright 
and Stephen 1980, p. 479; Xerces Society and Thorp 2010, p. 6), and one 
of the most limited geographic distributions of any bumble bee in the 
world (Frison 1922, p. 315; Williams 1998, p. 129). The species has 
been recorded from the Umpqua and Rogue River Valleys in Oregon 
(Stephen 1957, p. 81) and from northern California, suggesting its 
restriction to the Klamath Mountain region of southern Oregon and 
northern California (Thorp et al. 1983, p. 8). Elevations where it has 
been observed range from 162 meters (m) (540 feet (ft)) in the northern 
part of its range, to over 2,340 m (7,800 ft) in the southern part of 
its range. All confirmed specimens have been found in an area about 306 
kilometers (km) (190 miles

[[Page 47223]]

(mi)) to the north and south, and 113 km (70 mi) east to west, between 
122[deg] to 124[deg] west longitude and 40[deg] 58' to 43[deg] 30' 
north latitude in Douglas, Jackson, and Josephine Counties in southern 
Oregon, and Siskiyou and Trinity Counties in northern California (Thorp 
1999, p. 3; Thorp 2005, p. 1; International Union for Conservation of 
Nature 2009, p. 1).
    Franklin's bumble bee was first observed in 1917, and first 
described in 1921, and limited occurrence and observation data exist 
for Franklin's bumble bee prior to 1998. The species has been found on 
many privately owned sites as well as municipal, State, and Federal 
land. Historical observations and occurrence data for Franklin's bumble 
bee prior to 1998 include opportunistic observations, student 
collections, and museum specimens, as well as the collections and notes 
of interested parties, natural resource managers, and university staff 
(Xerces Society and Thorp 2010, pp. 34-40). A more intensive and 
targeted search effort for the species began in 1998, in areas thought 
to have the highest likelihood of Franklin's bumble bee presence. There 
was initial success at finding a higher abundance of the species than 
ever previously reported; in one year (1998), 98 Franklin's bumble bees 
were observed (mostly from two sites). However, in subsequent years, 
searchers found fewer and fewer Franklin's bumble bees, and none have 
been found since the last sighting of a single individual in Oregon in 
2006. The variations in timing, scope, intensity, and methodology of 
search efforts (including those since 1998) and the lack of 
observations since 2006 prevent the identification of any population 
trends. Many of the occurrence records provide only point data for an 
occurrence, with no details on the size of the area searched or whether 
or not the record reflected a comprehensive search of an area. Many 
records also lack details on the level of survey effort per location 
(number of searchers, hours of search effort per day, number of days 
per search effort).
    The lack of systematic surveys across the historical range of the 
species over time prevents us from using occurrence records to 
extrapolate reasonable estimates of species abundance or distribution 
or from concluding that the species is extinct. Even though none have 
been seen since 2006, Franklin's bumble bee populations could 
potentially persist undetected. The areas chosen for survey were 
selected due to a combination of abundance of floral resources 
throughout the colony cycle, relatively recent historical occurrence of 
the species, and accessibility to surveyors. However, the surveyed area 
represents a relatively small percentage of the historical range of the 
Franklin's bumble bee; therefore, it is possible the species may 
persist in other areas of the range. There are numerous instances of 
species rediscovered after many years, even decades, of having been 
believed extinct (e.g., Scheffers et al. 2011, entire). As one example 
of such a case, the Fender's blue butterfly (Icaricia icarioides 
fenderi) of Oregon was believed extinct after the last recorded 
observation in 1937, until it was rediscovered in 1989, 52 years later 
(Hammond and Wilson 1992, p. 175; Hammond and Wilson 1993, p. 2). 
Recent approaches to evaluating extinction likelihood place increased 
emphasis on the extensiveness and adequacy of survey effort (Keith et 
al. 2017, p. 321; Thompson et al. 2017, p. 328), and caution against 
declaring a species as extinct in the face of uncertainty 
(Ak[ccedil]akaya et al. 2017, p. 340).
    The specific life-history characteristics and behavior of this rare 
species have not been studied; much of the information presented in the 
SSA report (Service 2018a, entire) is inferred from information on 
Bombus in general and some closely related species (western bumble bee 
(B. occidentalis), rusty patched bumble bee (B. affinis), and yellow-
faced bumble bee (B. vosnesenskii), among others). The report also 
relied heavily on information from species experts (Service 2018a, 
entire).
    Franklin's bumble bee is a primitively eusocial bumble bee, meaning 
they are highly social and adults have flexible roles in their social 
order. They live in colonies made up of a queen and her male and worker 
offspring, and adult females can switch from worker to queen roles. 
Like other eusocial Bombus species, Franklin's bumble bee typically 
nests underground in abandoned rodent burrows or other cavities that 
offer resting and sheltering places, food storage, nesting, and room 
for the colony to grow (Plath 1927, pp. 122-128; Hobbs 1968, p. 157; 
Thorp et al. 1983, p. 1; Thorp 1999, p. 5). The species may also 
occasionally nest on the ground (Thorp et al. 1983, p. 1) or in rock 
piles (Plowright and Stephen 1980, p. 475). It has even been found 
nesting in a residential garage in the city limits of Medford, Oregon 
(Thorp 2017, pers. comm.).
    Colonies of Franklin's bumble bee have an annual cycle, initiated 
each spring when solitary queens emerge from hibernation and seek 
suitable nest sites (Thorp 2017, pers. comm.). Colonies may contain 
from 50 to 400 workers along with the founding queen (Plath 1927, pp. 
123-124; Thorp et al. 1983, p. 2; Macfarlane et al. 1994, p. 7). Two 
colonies of Franklin's bumble bee that were initiated in the laboratory 
and set out to complete development in the field contained over 60 
workers by early September, and likely produced over 100 workers by the 
end of the season (Plowright and Stephen 1980, p. 477). The flight 
season of Franklin's bumble bee is from mid-May to the end of September 
(Thorp et al. 1983, p. 30); a few individuals have been encountered in 
October (Southern Oregon University Bee Collection records, in Xerces 
Society and Thorp 2010, Appendix 1, p. 39). At the end of the colony 
cycle, all the workers and the males die along with the founding queen; 
only the inseminated hibernating females (gynes) are left to carry on 
the genetic lineage into the following year (Duchateau and Velthius 
1988).
    As with all Bombus species, Franklin's bumble bee has a unique 
genetic system called the haplodiploid sex determination system. In 
this system, unfertilized (haploid) eggs become males that carry a 
single set of chromosomes, and fertilized (diploid) eggs become females 
that carry two sets of chromosomes. This system may result in lower 
levels of genetic diversity than the more common diploid-diploid sex 
determination system, in which both males and females carry two sets of 
chromosomes. Haplodiploid organisms may be more prone to population 
extinction than diploid-diploid organisms, due to their susceptibility 
to low population levels and loss of genetic diversity (Service 2018a, 
p. 37). Inbreeding depression in bumble bees can lead to the production 
of sterile diploid males (Goulson et al. 2008, p. 11.7) and negatively 
affects bumble bee colony size (Herrman et al. 2007, p. 1167), which 
are key factors in a colony's reproductive success.
    As one of the rarest Bombus species, Franklin's bumble bees are 
somewhat enigmatic, and a specific habitat study for the species has 
not been completed. Such a study was initiated in 2006, when the 
Franklin's bumble bee was last seen, but could not continue due to the 
subsequent absence of the species (Thorp 2017, pers. comm.). However, 
some general habitat associations of Bombus are known. Like all bumble 
bees, the Franklin's bumble bee requires a constant and diverse supply 
of flowers that bloom throughout the colony's life cycle, from spring 
to autumn (Xerces Society and Thorp 2010, p. 11); these resources would 
typically be found in open (non-forested) meadows in proximity to seeps 
and other wet

[[Page 47224]]

meadow environments. The nectar from flowers provides carbohydrates, 
and the pollen provides protein. Franklin's bumble bee may have a 
foraging distance of up to 10 km (6.2 mi) (Thorp 2017, pers. comm.), 
but the species' typical dispersal distance is most likely 3 km (1.86 
mi) or less (Hatfield 2017, pers. comm.; Goulson 2010, p. 96). 
Franklin's bumble bee have been observed collecting pollen from lupine 
(Lupinus spp.) and California poppy (Eschscholzia californica), and 
collecting nectar from horsemint or nettle-leaf giant hyssop (Agastache 
urticifolia) and mountain monardella (Monardella odoratissima) (Xerces 
Society and Thorp 2010, p. 11). Franklin's bumble bee may also collect 
both pollen and nectar from vetch (Vicia spp.), as well as rob nectar 
from it (Xerces Society and Thorp 2010, p. 11). Short-tongued species, 
including Franklin's bumble bee, sometimes visit flowers that are quite 
elongated and have difficulty reaching nectar deep in the flower. These 
bees can `rob nectar' by chewing a hole on the outside of the flower at 
the base, through which they can easily reach the nectar with their 
tongues.
    In summary, Franklin's bumble bee has been found in a wide array of 
sheltered and exposed habitat types at a broad elevational range, and 
the species appears to be a generalist forager. Despite uncertainties 
regarding the species' habitat needs, we know they need (1) floral 
resources for nectaring throughout the colony cycle, and (2) relatively 
protected areas for breeding and shelter. The habitat elements that 
Franklin's bumble bee appears to prefer to fulfill those needs 
mentioned above are relatively plentiful and widely distributed.

Regulatory and Analytical Framework

Regulatory Framework

    Section 4 of the Act (16 U.S.C. 1533) and its implementing 
regulations (50 CFR part 424) set forth the procedures for determining 
whether a species is an ``endangered species'' or a ``threatened 
species.'' The Act defines an endangered species as a species that is 
``in danger of extinction throughout all or a significant portion of 
its range,'' and a threatened species as a species that is ``likely to 
become an endangered species within the foreseeable future throughout 
all or a significant portion of its range.'' The Act requires that we 
determine whether any species is an ``endangered species'' or a 
``threatened species'' because of any of the following factors:
    (A) The present or threatened destruction, modification, or 
curtailment of its habitat or range;
    (B) Overutilization for commercial, recreational, scientific, or 
educational purposes;
    (C) Disease or predation;
    (D) The inadequacy of existing regulatory mechanisms; or
    (E) Other natural or manmade factors affecting its continued 
existence.
    These factors represent broad categories of natural or human-caused 
actions or conditions that could have an effect on a species' continued 
existence. In evaluating these actions and conditions, we look for 
those that may have a negative effect on individuals of the species, as 
well as other actions or conditions that may ameliorate any negative 
effects or may have positive effects.
    We use the term ``threat'' to refer in general to actions or 
conditions that are known to or are reasonably likely to negatively 
affect individuals of a species. The term ``threat'' includes actions 
or conditions that have a direct impact on individuals (direct 
impacts), as well as those that affect individuals through alteration 
of their habitat or required resources (stressors). The term ``threat'' 
may encompass--either together or separately--the source of the action 
or condition or the action or condition itself.
    However, the mere identification of any threat(s) does not 
necessarily mean that the species meets the statutory definition of an 
``endangered species'' or a ``threatened species.'' In determining 
whether a species meets either definition, we must evaluate all 
identified threats by considering the expected response by the species, 
and the effects of the threats--in light of those actions and 
conditions that will ameliorate the threats--on an individual, 
population, and species level. We evaluate each threat and its expected 
effects on the species, then analyze the cumulative effect of all of 
the threats on the species as a whole. We also consider the cumulative 
effect of the threats in light of those actions and conditions that 
will have positive effects on the species, such as any existing 
regulatory mechanisms or conservation efforts. The Secretary determines 
whether the species meets the definition of an ``endangered species'' 
or a ``threatened species'' only after conducting this cumulative 
analysis and describing the expected effect on the species now and in 
the foreseeable future.

Analytical Framework

    The SSA report documents the results of our comprehensive 
biological review of the best available scientific and commercial data 
regarding the status of the species, including an assessment of the 
potential threats to the species. The SSA report does not represent a 
decision by the Service on whether the species should be listed as an 
endangered or threatened species under the Act. It does, however, 
provide the scientific basis that informs our regulatory decisions, 
which involve the further application of standards within the Act and 
its implementing regulations and policies. The following is a summary 
of the key results and conclusions from the SSA report; the full SSA 
report can be found at Docket No. FWS-R1-ES-2018-0044 on https://www.regulations.gov.
    To assess the viability of Franklin's bumble bee, we used the three 
conservation biology principles of resiliency, redundancy, and 
representation (Shaffer and Stein 2000, pp. 306-310). Briefly, 
resiliency supports the ability of the species to withstand 
environmental and demographic stochasticity (for example, wet or dry, 
warm or cold years), redundancy supports the ability of the species to 
withstand catastrophic events (for example, droughts, large pollution 
events), and representation supports the ability of the species to 
adapt over time to long-term changes in the environment (for example, 
climate changes). In general, the more resilient and redundant a 
species is and the more representation it has, the more likely it is to 
sustain populations over time, even under changing environmental 
conditions. Using these principles, we identified the species' 
ecological requirements for survival and reproduction at the 
individual, population, and species levels, and described the 
beneficial and risk factors influencing the species' viability.
    The SSA process can be categorized into three sequential stages. 
During the first stage, we evaluated the individual species' life-
history needs. The next stage involved an assessment of the historical 
and current condition of the species' demographics and habitat 
characteristics, including an explanation of how the species arrived at 
its current condition. The final stage of the SSA involved making 
predictions about the species' responses to positive and negative 
environmental and anthropogenic influences. Throughout all of these 
stages, we used the best available information to characterize 
viability as the ability of a species to

[[Page 47225]]

sustain populations in the wild over time. We use this information to 
inform our regulatory decision.

Summary of Biological Status and Threats

    In this discussion, we review the biological condition of the 
species and its resources, and the threats that influence the species' 
current and future condition, in order to assess the species' overall 
viability and the risks to that viability.
    To assess resiliency and redundancy, we evaluated the change in 
Franklin's bumble bee occurrences (populations) over time. To assess 
representation (as an indicator of adaptive capacity) of the Franklin's 
bumble bee, we evaluated the spatial extent of occurrences over time. 
We evaluated the change in resiliency, representation, and redundancy 
from the past until the present; however, due to the lack of 
observations of the species since 2006, we did not project anticipated 
future states of these conditions.
    Our analyses indicate that the resiliency, redundancy, and 
representation of the Franklin's bumble bee have all declined since the 
late 1990s. Historically, the species has always been rare and has one 
of the narrowest distributions of any Bombus species in the world. Even 
so, the abundance and distribution of Franklin's bumble bee has 
declined significantly (Service 2018a, pp. 10-14); the species has not 
been observed since 2006, despite intensive survey efforts in select 
portions of its historical range. Search efforts for the species have 
been varied in timing, scope, intensity, and methodology. During the 
more intensive surveys from 1998 until the last observation in 2006, 
the Franklin's bumble bee was observed at 14 locations, including 8 
locations where it had not been previously documented. In 1998, 98 bees 
were found among 11 locations. Searchers found fewer and fewer bees 
after that year even though they continued extensive searches in 
multiple locations with the highest likelihood of finding the species. 
Twenty bees were located in 1999, nine individuals were observed in 
2000, and one individual was observed in 2001. Although 20 Franklin's 
bumble bees were observed in 2002, only 3 were observed in 2003 (all at 
a single locality), and a single worker bee was observed in 2006. 
Despite continued intensive search efforts in these areas through 2019, 
there have been no confirmed observations of the Franklin's bumble bee 
since 2006. Data allow us to estimate 43 potential populations of the 
species since 1921, when the first description of the species was 
published (Service 2018a, pp. 11). From 1998 to 2006, we identified 14 
potential populations. Since 2006, no populations have been located.
    The vulnerability resulting from the Franklin's bumble bee's 
haplodiploid genetic system, as well as the loss in the abundance and 
spatial extent of its populations, suggest the resiliency, 
representation, and redundancy of the Franklin's bumble bee have all 
declined significantly since the late 1990s. The losses in both the 
number of populations and their spatial extent render the Franklin's 
bumble bee vulnerable to extinction even without further external 
stressors (e.g., pathogens and insecticide exposure) acting upon the 
species.
    As part of our status assessment of the Franklin's bumble bee, we 
looked at potential stressors affecting the species' viability (Service 
2018a, pp. 23-40). Potential stressors that we analyzed for the 
Franklin's bumble bee generally fit into three groups that correspond 
with Factors A (habitat loss and fragmentation), C (pathogens), or E 
(pesticide use, competition with nonnative bees, and effects of small 
population size). No potential stressors of the Franklin's bumble bee 
correspond with Factor B. There has never been any indication that the 
Franklin's bumble bee was at risk of overutilization for commercial, 
recreational, scientific, or educational purposes, and we did not find 
any new information to suggest this has changed. Existing regulatory 
mechanisms (Factor D) are discussed below in the context of how they 
help to reduce or ameliorate stressors to the Franklin's bumble bee.
    The 2010 petition identified destruction, degradation, and 
conversion of habitat as a threat to the Franklin's bumble bee. In our 
90-day finding on the 2010 petition (76 FR 56381; September 13, 2011), 
we noted that the petitioners provided substantial information on 
threats to the Franklin's bumble bee from the destruction, 
modification, or curtailment of habitat, primarily due to the potential 
impacts of natural or prescribed fire. Because the loss and degradation 
of habitat has been shown to reduce both diversity and abundance in 
other Bombus species (Potts et al. 2010, pp. 348-349), we looked at the 
potential stressors of natural or prescribed fire, agricultural 
intensification, urban development, livestock grazing, and the effects 
of climate change (Service 2018a, pp. 23-40).
    Although conversion of natural habitat appears to be the primary 
cause of bumble bee habitat loss throughout the world (Goulson et al. 
2015, p. 2; Kosior et al. 2010, p. 81), many researchers believe it is 
unlikely to be a main driver of the recent, widespread North American 
bee declines (Szabo et al. 2012, p. 236; Colla and Packer 2008, p. 
1388; Cameron et al. 2011, p. 665). Despite uncertainties regarding the 
Franklin's bumble bee's habitat needs, we know they need (1) floral 
resources for nectaring throughout the colony cycle, and (2) relatively 
protected areas for breeding and shelter. Furthermore, the available 
information regarding locations where the species has been found 
indicates that the Franklin's bumble bee is a generalist forager and 
that the species' specific needs and preferences for these habitat 
elements are relatively flexible, plentiful, and widely distributed. 
While we can say that Bombus species in general might prefer protected 
meadows with an abundance of wildflowers, the Franklin's bumble bee has 
been found in a wide array of sheltered and exposed habitat types at 
elevations ranging from 540 ft (162 m) to 7,800 ft (2,340 m) (Thorp 
2017, pers. comm.).
Natural or Prescribed Fire
    Fire caused by both natural and human-caused factors has been an 
important change on the landscape in the range of the Franklin's bumble 
bee. Because fire reduces natural succession of forests through the 
burning of encroaching woody plants, fire is a primary factor in the 
maintenance of grassland and meadow habitat that can support Bombus 
species (Shultz and Crone 1998, p. 244; Huntzinger 2003, p. 2). With 
the increase in human development came fire suppression to limit damage 
to manmade structures. Fire suppression allows woody encroachment to 
occur, and the diverse landscape created by fire (open areas mixed 
within forested areas) is slowly being replaced by increasing areas of 
denser forested habitat; the open areas that facilitated the growth of 
diverse understory plant communities are being reduced from their 
historical condition (Ruchty 2011, p. 26). Conifer species now cover 
some of the area that was previously open meadow habitat in the range 
of the Franklin's bumble bee (Panzer 2002, p. 1297; Shultz and Crone 
1998, p. 244). Although this loss of habitat by fire suppression may 
have limited the availability and diversity of floral resources, as 
well as nest and overwintering habitat for the Franklin's bumble bee, 
healthy meadow habitat remains in areas where the Franklin's bumble bee 
was previously found (Godwin 2017, pers comm.; Colyer 2017, pers. 
comm.), and it is unlikely

[[Page 47226]]

that loss of habitat from fire suppression was a factor in the decline 
of the species.
    Increased fuel loads from fire suppression heighten the potential 
for catastrophic, large-scale, and high temperature wildfires. Any 
Bombus colonies in the path of this type of fire would be at risk of 
extirpation. Wildfire may have extirpated some historical populations 
of the Franklin's bumble bee, but we have no information suggesting 
that any known Franklin's bumble bee occurrence sites were in the path 
of catastrophic wildfires at the time the sites were occupied. 
Controlled burning became a management tool for reducing potential fuel 
loads for wildfire; controlled burning is carried out by Federal land 
management agencies including the U.S. Forest Service and Bureau of 
Land Management in the range of the Franklin's bumble bee. The effects 
of fire on invertebrates depends greatly on the biology of the specific 
taxa (Gibson et al. 1992, p. 166), and in the case of the Franklin's 
bumble bee, controlled burns could certainly cause death of individual 
bees and negative effects to a colony. Prescribed fire is likely to 
continue to be used as a management tool on some Federal land; however, 
the practice is overall small in scale, opportunistic (depending on 
weather, funding, and a host of other factors), used to prevent 
catastrophic fire, and often a net benefit to pollinators as it opens 
habitat by decreasing canopy cover (U.S. Forest Service 1989, IV 87 to 
IV 90, IV-113 to IV-119; U.S. Forest Service 1990, pp 4-149 to 4-179). 
In summary, we have no information to indicate that controlled burns 
were a factor in the decline of the Franklin's bumble bee or will 
increase in the future to a degree that may affect the viability of the 
species.
Agricultural Intensification
    Agricultural intensification can result in habitat loss for bumble 
bees, as these practices often result in the planting of monocultures 
that tend to provide floral resources for a limited period of time, 
rather than throughout the colony's life cycle. Agricultural 
intensification can negatively impact wild bees by reducing floral 
resource diversity and abundance (Service 2018a, p. 32). Agricultural 
intensification was determined to be a primary factor leading to the 
local extirpation and decline of bumble bees in Illinois (Grixti et al. 
2009, p. 75). An increased use of herbicides often accompanies 
development and agricultural intensification, and the widespread use of 
herbicides in agricultural, urban, and even natural landscapes has led 
to decreases in flowering plants (Potts et al. 2010, p. 350).
    Within the historical range of the Franklin's bumble bee, total 
acres in agricultural cropland decreased in all three counties in 
Oregon (Douglas, Jackson, and Josephine) by greater than 50 percent 
from 1997 to 2012 (U.S. Department of Agriculture--National Agriculture 
Statistics Service 2017, pers. comm.; Service 2018a, p. 33). While the 
total number of acres of agricultural cropland is not synonymous with 
agricultural intensification (specifically, the expansion of 
monocultures), a decrease in total acres of agriculture leads us to 
conclude that agricultural intensification was not likely a factor in 
the decline of the Franklin's bumble bee. We have no documentation in 
our files or any direct evidence that agricultural intensification has 
contributed to the decline of the Franklin's bumble bee or will 
increase in the future to a degree that may affect the viability of the 
species. Approximately 42 percent of sites where Franklin's bumble bees 
have ever been reported (18 of 43) occur on federally owned land, 
primarily U.S. Forest Service and Bureau of Land Management land; very 
little habitat on these lands has been permanently altered or lost 
through agricultural intensification (Service 2018a, p. 32).
Urban Development
    Ongoing urbanization contributes to the loss and fragmentation of 
natural habitats. Urban gardens and parks provide habitat for some 
pollinators, including bumble bees (Frankie et al. 2005, p. 235; 
McFrederick and LeBuhn 2006, p. 372), but they tend not to support the 
species richness of bumble bees that can be found in nearby undeveloped 
landscapes (Xerces Society and Thorp 2010, p. 13) or that which was 
present historically (McFrederick and LeBuhn 2006). However, Franklin's 
bumble bee and western bumble bee have both been observed in urban 
areas of Ashland, Oregon, and in residential areas of Medford, Oregon. 
Furthermore, approximately 42 percent of the sites where Franklin's 
bumble bee have ever been reported (18 of 43) occur on federally owned 
land, primarily U.S. Forest Service and Bureau of Land Management land, 
and very little habitat on these lands has been permanently altered or 
lost through development.
    Generally good habitat conditions currently exist throughout the 
known historical Franklin's bumble bee locations and all of the recent 
focused survey areas. Two notable events occurred in areas with 
previous observations of Franklin's bumble bee: The creation of Lake 
Applegate upon the completion of Applegate Dam in the fall of 1980, and 
a report of soil modification on a portion of the Gold Hill site in 
2004; however, we have no information to indicate that Franklin's 
bumble bees were still in the vicinity or had any colonies in the area 
when these events occurred. The Applegate Dam project inundated two 
sites with historical observations of Franklin's bumble bee (from the 
1960s), but no subsequent search efforts or observations (Xerces 
Society and Thorp 2010, p. 13; Thorp, pers. comm. 2017). The June 23, 
2010, petition noted that in 2004, soil had been excavated and 
deposited in a portion of the Gold Hill area (Xerces Society and Thorp 
2010, p. 13). The last observation of Franklin's bumble bee at Gold 
Hill was in the year 2000, and the site was revisited 14 times over the 
next 3 years with no observations of Franklin's bumble bee. In both of 
these cases, we have no information to suggest the species was still 
using the habitat in the area by the time the activities took place, 
and therefore no information to suggest that either of these events 
affected the resiliency of any population of Franklin's bumble bee. We 
have no documentation in our files or any direct evidence that 
urbanization or development in the range of Franklin's bumble bee, or 
the incidents described above, contributed to the decline of the 
species or will increase in the future to a degree that may affect the 
viability of the species (Portland State University 2015, p. 7).
Livestock Grazing
    Livestock grazing occurs on public land in much of the historical 
range of the Franklin's bumble bee. Overgrazing by sheep between 1890 
and 1920 resulted in trampling vegetation and denuding soils, and 
grazing is currently evident today in the continuing erosion of the 
granitic soils of the McDonald Basin, Siskiyou Gap, Mt. Ashland, and 
the Siskiyou Crest (LaLande 1995, p. 31; T. Atzet 2017, pers. comm.). 
Several studies on the impacts of livestock grazing on bees suggest 
that an increase in the intensity of livestock grazing affects the 
species richness of bees (Service 2018a, p. 35). In contrast, grazing, 
especially by cattle, can play a key positive role in maintaining the 
abundance and species richness of preferred bumble bee forage (Carvell 
2002, p. 44). Evidence of livestock grazing was observed interspersed 
within abundant floral resources in Franklin's bumble bee habitat 
during several recent targeted survey efforts

[[Page 47227]]

(Brooks 1997, pers. comm.; Service 2016, entire; Service 2017, entire; 
Trail 2017, pers. comm.). We have no new information that the timing, 
location, intensity, or duration of grazing has changed, with the 
exception of the Cascade-Siskiyou National Monument, where most grazing 
has been retired (Colyer 2018, pers. comm.). The lack of specific 
information on the impacts of livestock grazing on the Franklin's 
bumble bee limits our ability to connect the activity to any specific 
species' response, and we do not anticipate grazing will increase in 
the future to a degree that may affect the viability of the species 
(Bureau of Land Management 2016, pp. 96-103).
Effects of Climate Change
    Specific impacts of climate change on pollinators are not well 
understood; most of the existing information on climate change impacts 
to pollinators comes from studies on butterflies. Studies specifically 
relating to bumble bees are scant, and we found no climate change 
information specific to the Franklin's bumble bee. Changes in 
temperature and precipitation, and the increased frequency of storm 
events, can affect pollinator population sizes directly, by affecting 
survival and reproduction (Intergovernmental Panel on Climate Change 
2013, entire; Bale et al. 2002, p. 11; Roland and Matter 2016, p. 22). 
These climatic changes can also affect populations indirectly, by 
altering resource availability and species interactions (Service 2018a, 
p. 36).
    Bumble bee abundance for three species of Bombus in the Rocky 
Mountains increased when floral resources were available for more days, 
and the number of days when floral resources were available increased 
with greater summer precipitation and later snowmelt dates (Ogilvie et 
al. 2017, p. 4). Several of the targeted Franklin's bumble bee and 
western bumble bee survey reports between 2015 and 2017 include mention 
of widespread hot, dry climate affecting timing and abundance of floral 
resources during the surveys (Bureau of Land Management 2015, p. 2; 
Trail 2017, pers. comm.). Although the Olgilvie et al. study and the 
survey reports suggest potential indirect effects of climate change on 
Bombus, we have no information to indicate that the effects of climate 
change were connected to the decline of the Franklin's bumble bee; 
numerous Bombus species persist in areas that are considered good 
quality habitat for the Franklin's bumble bee (Pool 2014, entire; 
Colyer 2016, entire). As a habitat generalist, Franklin's bumble bee 
appears to forage on a variety of floral resources, and we have no 
information to suggest that they would not forage off of whatever 
floral resource was in bloom at the time they emerge from their nests. 
We have no information to suggest that any changes in the vegetation 
community to date led to the decline of the species.
    In order to understand the potential future impact of climate 
change on Franklin's bumble bee, we looked at climate change projection 
models. Global climate projections are informative and, in some cases, 
the only or the best scientific information available for us to use. 
However, projected changes in climate and related impacts can vary 
substantially across and within different regions of the world 
(Intergovernmental Panel on Climate Change 2007, pp. 8-12). Therefore, 
we use ``downscaled'' projections when they are available and have been 
developed through appropriate scientific procedures because such 
projections provide higher-resolution information that is more relevant 
to spatial scales used for analyses of a given species (see Glick et 
al. 2011, pp. 58-61, for a discussion of downscaling).
    Downscaled projections as of 2016 were available for our analysis 
of the Franklin's bumble bee from the U.S. Geological Survey's National 
Climate Change Viewer (Alder, J. and S. Hostetler. 2016, entire). The 
National Climate Change Viewer is based on the mean of 30 models, which 
can be used to predict changes in air temperature and precipitation for 
Jackson County, Oregon (location of the last known occurrence record of 
Franklin's bumble bee), for two greenhouse gas emission scenarios, 
RCP4.5 and RCP8.5. From the year 2020 to the year 2050, the model set 
shows an increase in the mean maximum air temperature of between 1.9 
degrees Fahrenheit ([deg]F) (1 degree Celsius ([deg]C)) (RCP4.5) and 
3.1 [deg]F (1.7 [deg]C) (RCP8.5), and an increase in the mean annual 
minimum air temperature of between 1.0 [deg]F (0.3 [deg]C) (RCP4.5) and 
2.7 [deg]F (1.5 [deg]C) (RCP8.5). For both scenarios, mean 
precipitation is predicted to decrease by approximately 0.4 inches (10 
millimeters) for both scenarios.
    Projections for an increase in temperature and decrease in 
precipitation over the next 30 years may lead to alteration in the 
vegetation community in Franklin's bumble bee habitat, including the 
varieties of floral resources that Franklin's bumble bee relies on for 
nectar. However, we have no information to suggest that these changes 
will result in a decrease in the availability of nectar resources to 
the species. Some studies suggest that pollinators are responding to 
climate change with recent latitudinal and elevational range shifts 
such that there is spatial mismatch among plants and their pollinators; 
while this has been demonstrated in butterflies, it may be less of a 
factor for bumble bees (Service 2018a, p. 36). As generalist foragers, 
bumble bees do not require synchrony with a particular plant species, 
although some bumble bee populations are active earlier in the season 
than in the past (Bartomeus et al. 2011, p. 20646).
    Projections for an increase in temperature and decrease in 
precipitation over the next 30 years may also affect the frequency or 
intensity of wildfires and storm events (including flooding). These 
events could affect the availability of floral resources, the 
suitability of nest locations, and the survival of overwintering 
queens. However, we do not have information projecting the timing, 
scope, or intensity of wildfires or storms; the stochastic nature of 
these events limits our ability to project the magnitude of impact on 
the future condition of Franklin's bumble bee or its habitat, and 
hinders our ability to assess their impact on the viability of the 
species.
Summary
    Although habitat loss has had negative effects on bumble bees, we 
conclude it is unlikely to be a main driver of the decline of the 
Franklin's bumble bee. Habitat appears generally intact and in good 
condition throughout the known, historical locations of the Franklin's 
bumble bee and throughout all of the recent focused survey areas (with 
the exceptions of the historical sites affected by the creation of Lake 
Applegate in the fall of 1980, and soil modification that occurred on a 
portion of the Gold Hill site in 2004). In our assessment, we found no 
information to suggest that destruction, degradation, or conversion of 
habitat occurred at a scope and magnitude that would cause it to be a 
primary factor in the decline of the Franklin's bumble bee (Service 
2018a, pp. 35-37). Furthermore, we have no information to suggest that 
habitat destruction or modification will increase in scope and 
magnitude to the point where it will be a primary stressor to the 
species in its range in the near future.
    A number of diseases and parasites are known to occur in bumble bee 
populations. These include the protozoan parasite Crithidia bombi (C. 
bombi), the tracheal mite Locustacarus buchneri, the microsporidium 
(parasitic fungus) Nosema bombi (N. bombi), as well as deformed wing 
virus. Pathogens

[[Page 47228]]

and parasites are widespread generalists in the host genus, but affect 
species differently according to host susceptibility and tolerance to 
infection (Kissinger et al. 2011, p. 221; Malfi and Roulston 2014, p. 
18). The host species' life history plays a role in the virulence of a 
given pathogen; for instance, parasites may have relatively smaller 
effects on species with shorter colony life cycles and smaller colony 
sizes (Rutrecht and Brown 2009, entire).
    Pathogen spillover is a process whereby parasites and pathogens 
spread from commercial bee colonies to native bee populations (Colla et 
al. 2006, p. 461; Otterstatter and Thompson 2008, p. 1). The decline of 
certain Bombus species from the mid-1990s to present, particularly 
species in the subgenus Bombus sensu stricto (including Franklin's 
bumble bee), was contemporaneous with the collapse of commercially bred 
western bumble bee (raised primarily to pollinate greenhouse tomato and 
sweet pepper crops beginning in the late 1980s) (Szabo et al. 2012, pp. 
232-233). This collapse was attributed to infections of Nosema bombi.
    Nosema bombi has been detected in native bumble bees in North 
America, and has been found to be a part of the natural pathogen load. 
The fungus has been reported in Canada since the 1940s (Cordes et al. 
2011, p. 7) and appears to have a broad host range in North American 
(Kissinger et al. 2011, p. 222). Infections of the pathogen primarily 
occur in the malpighian tubules (small excretory or water regulating 
glands), but also in fat bodies, nerve cells, and sometimes the trachea 
(Macfarlane et al. 1995). Bombus colonies can appear to be healthy but 
still carry N. bombi and transmit it to other colonies, most likely 
when spores are fed to larvae and then infected adults drift into non-
natal colonies (Service 2018a, p. 25).
    While we have no evidence of direct effects of a virulent strain of 
N. bombi on the Franklin's bumble bee, N. bombi has been detected in 
closely related species in the range of the Franklin's bumble bee. 
Furthermore, N. bombi infections in rare species like the Franklin's 
bumble bee are more frequent, are more severe, and seem to affect a 
higher percentage of individuals of the species (Cameron et al. 2011, 
entire; Cordes et al. 2011, p. 2).
    The effect of pathogens on bumble bees varies from mild to severe 
(Macfarlane et al. 1995; Rutrecht et al. 2007, p. 1719; Otti and 
Schmid-Hempel 2008, p. 577). Bumble bees infected with Nosema bombi may 
have crippled wings, and queens may have distended abdomens and be 
unable to mate (Otti and Schmid-Hempel 2007, pp. 122-123). Malfi and 
Roulston (2014, p. 24) found that N. bombi infections are more frequent 
and more severe in rare species, and the species with the highest 
percentages of infected individuals were rare species. Furthermore, the 
effects of pathogen infection on bumble bees may be amplified by other 
influence factors. Nutritional stress may compromise the ability of 
bumble bees to survive parasitic infections, as evidenced by a 
significant difference in mortality in bumble bees on a restricted diet 
compared to well-fed bees infected with C. bombi (Brown et al. 2000, 
pp. 424-425).
    A virulent strain of Nosema bombi from the buff-tailed bumble bee 
(Bombus terrestris) may have spread to the eastern bumble bee (B. 
impatiens) and western bumble bee from Europe. In the mid-1990s, 
companies shipped queen eastern and western bumble bees to Europe for 
their development into colonies to use in commercial pollination 
services. When the colonies had reached sufficient size, they were 
shipped back to the United States and deployed in industrial greenhouse 
operations in California, primarily to pollinate tomatoes and peppers. 
The colonies may have picked up N. bombi prior to their shipment back 
into the United States, and once in this country, the commercially 
reared colonies may have spread the virulent strain to wild populations 
of Franklin's bumble bee (Xerces Society and Thorp 2010, p. 14). In 
work partially funded by the Service, the University of Illinois 
conducted surveys for parasites and pathogens in bumble bee populations 
of the Pacific Northwest and Midwest between 2005 and 2009. The goal 
was to assess Bombus populations for presence and prevalence of 
pathogens, particularly microsporidia, in an effort to provide baseline 
data to assess disease as a potential factor in the decline of the 
Franklin's bumble bee, western bumble bee, and American bumble bee (B. 
pensylvanicus) (Solter et al. 2010, p. 1). The highest prevalence of N. 
bombi was found in western bumble bee, with 26 percent of collected 
individuals infected. Crithidia bombi infections of western bumble bee 
were 2.8 percent overall (Solter et al. 2010, pp. 3-4); no Franklin's 
bumble bees were collected during the study. However, Mt. Ashland, 
Oregon, was one of only three sites in the Pacific Northwest study area 
where N. bombi infections were found in multiple Bombus species (the 
indiscriminate cuckoo bumble bee (B. insularis) and black-notched 
bumble bee (B. bifarius)) (Solter et al. 2010, pp. 3-4). Although 
Cordes et al. (2011, p. 7) found a new allele in N. bombi, the recent 
study by Cameron et al. (2016) found no evidence of an exotic strain of 
N. bombi.
    In summary, known pathogens occur within the historical range of 
the Franklin's bumble bee, and we have evidence of several pathogens 
infecting closely related species within that range that have also 
likely affected the Franklin's bumble bee. Although we have no direct 
evidence of pathogens playing a role in the decline of the Franklin's 
bumble bee, the disappearance of the Franklin's bumble bee occurred 
soon after a period of potential exposure to introduced pathogens, 
particularly N. bombi, which is known to have a more severe impact on 
rare species like the Franklin's bumble bee. Decline of other closely 
related pollinators has been associated with these pathogens, and it is 
highly likely pathogens have had some negative influence on the 
resiliency of Franklin's bumble bee populations.
Pesticide Use
    Exposure to pesticides can occur to bumble bees from direct spray 
or drift, or from gathering or consuming contaminated nectar or pollen 
(Johansen and Mayer 1990; Morandin et al. 2005, p. 619). Lethal and 
sublethal effects on bumble bee eggs, larvae, and adults have been 
documented for many different pesticides under various scenarios 
(Service 2018a, p. 28). Documented sub-lethal effects to individual 
bumble bees and colonies include reduced or no male production, reduced 
or no egg hatch, reduced queen production, reduced queen longevity, 
reduced colony weight gain, reduced brood size, reduced feeding, 
impaired ovary development, and an increased number of foragers or 
foraging trips or duration (interpreted as risky behaviors) (Service 
2018a, p. 28). Bumble bee habitat can also be impacted by pesticides 
due to changes in vegetation and the removal or reduction of flowers 
needed to provide consistent sources of pollen, nectar, and nesting 
material (Service 2018a, p. 28). Declines in bumble bees in parts of 
Europe have been at least partially attributed to the use of pesticides 
(Williams 1986, p. 54; Kosior et al. 2007, p. 81).
    Although the use of land for agricultural purposes has 
traditionally involved the use of pesticides and other products toxic 
to bees, one particular class of insecticides known as neonicotinoids 
have been strongly implicated in the decline of honey bees (Apis spp.) 
worldwide, and implicated in the decline of several Bombus

[[Page 47229]]

species, including rusty patched bumble bee, buff-tailed bumble bee, 
and eastern bumble bee (Pisa et al. 2015, p. 69; Goulson 2013, pp. 7-8; 
Colla and Packer 2008, p. 10; Lundin et al. 2015, p. 7). Neonicotinoids 
are a broad class of insecticides based on nicotine compounds used in a 
variety of agricultural applications; they act as a neurotoxin, 
affecting the central nervous system of insects by interfering with the 
receptors of the insects' nervous system, causing overstimulation, 
paralysis, and death (Douglas and Tooker 2015, pp. 5090-5092). The 
neonicotinoid family of insecticides includes acetamiprid, 
clothianidin, imidacloprid, nitenpyram, nithiazine, thiacloprid, and 
thiamethoxam. In the range of the Franklin's bumble bee (Jackson, 
Douglas, and Josephine Counties in Oregon, as well as Trinity and 
Siskiyou Counties in California), the first reported use of 
imidacloprid was in 1996, thiamethoxam in 2001, and clothianidin in 
2004. The use of neonicotinoid pesticides continued in the range of the 
species through 2006, when the last observation of the Franklin's 
bumble bee was recorded. Across all five counties, total estimated 
applications of these three neonicotinoids increased from 53.31 pounds 
(lbs) (24.19 kilograms (kg)) in 1996, to 1,144.6 lbs (519.9 kg) in 
2014. However, the exponential growth of neonicotinoid applications 
started in 2011, 5 years after the last observation of the species. The 
vast majority of neonicotinoids are used as seed treatments on grains 
and other field crops (Oregon Department of Agriculture 2018, pers. 
comm.), and total agricultural land within the historical range of the 
species is less than 2 percent of the total land base (2011 National 
Land Cover Data Set and 2016 USDA Crop Data Layers (CDL) in Syngenta 
2019, pers. comm).
    No studies have investigated the effects of pesticide use on the 
Franklin's bumble bee, and no discoveries have been documented of any 
Franklin's bumble bees injured or killed by pesticides. The Franklin's 
bumble bee is a habitat generalist and is not known to have a close 
association with agricultural lands; therefore, it may have less 
exposure to pesticides than some other Bombus species. However, 
pesticide use occurs in the range of the Franklin's bumble bee. The 
similarity in foraging traits that the Franklin's bumble bee has with 
both honey bees and the other Bombus species (e.g., generalist foragers 
collecting pollen from similar food sources) allows us to infer that 
Franklin's bumble bee populations are likely to suffer exposure to and 
impacts from pesticides in similar measure to other Bombus species when 
the Franklin's bumble bee is in areas where pesticides are applied.
Effects of Small Population Size
    The Franklin's bumble bee is rare and has always had very small 
populations (relative to other similar, native bumble bees in the 
western United States), and likely has low genetic diversity due to the 
haplodiploid genetic system it shares with all Bombus species (Zayed 
2009, p. 238). These factors make the species more vulnerable to 
habitat change or loss, parasites, diseases, stochastic events, and 
other natural disasters such as droughts (Xerces Society and Thorp 
2010, p. 20). Between 1998 and 2006, the number of Franklin's bumble 
bee observations went from a high of 98 at 11 locations, to a lone 
individual in 2006. No observations of the Franklin's bumble bee have 
occurred since 2006, despite an increase in survey effort. Diploid male 
production has been detected in naturally occurring populations of 
bumble bees, and recent modeling work has shown that diploid male 
production may initiate a rapid extinction vortex (a situation in which 
genetic and demographic traits and environmental conditions reinforce 
each other in a downward spiral, leading to extinction) (Goulsen et al. 
2008, p. 11.8). Because of inbreeding and the production of sterile 
males, the haplodiploid genetic system makes bumble bees very 
vulnerable when populations get small (Colla 2018, pers. comm.). 
Although we have no direct evidence that small population size or a 
rapid extinction vortex contributed to the decline of the species, the 
genetic system and historically small population size of the Franklin's 
bumble bee likely heightened the species' vulnerability to other 
threats in the environment; we, therefore, consider the effects of 
small population size a synergistic threat to the species.
Competition With Nonnative Bees
    The European honey bee (Apis mellifera) was first introduced to 
eastern North America in the early 1620s, and into California in the 
early 1850s (Xerces Society and Thorp 2010, p. 21). The resource needs 
of the European honey bee and native Bombus species may overlap, 
resulting in the potential for increased competition for resources 
(Thomson 2004, p. 458; Thomson 2006, p. 407). Decreased foraging 
activity and lowered reproductive success of Bombus colonies have been 
noted near European honey bee hives (Evans 2001, pp. 32-33; Thomson 
2004, p. 458; Thomson 2006, p. 407). Additionally, the size of workers 
of native Bombus species were noticeably reduced where European honey 
bees were present, which may be detrimental to Bombus colony success 
(Goulson and Sparrow 2009, p. 177). It is likely that the effects 
discussed in these studies are local in space and time, and most 
pronounced where floral resources are limited and large numbers of 
commercial European honey bee colonies are introduced (Xerces Society 
and Thorp 2010, p. 21). We have no information to indicate that any 
area of Franklin's bumble bee habitat in the range of the species has 
limited floral resources and large numbers of European honey bees. We 
have no information related to the specific placement of commercial 
honey bee colonies in or near Franklin's bumble bee habitat. 
Furthermore, European honey bees have been present without noticeable 
declines in Bombus populations over large portions of their ranges 
(Xerces Society and Thorp 2010, p. 21), and we have no new information 
that connects competition from European honey bees to the decline of 
the Franklin's bumble bee.
    There is potential for nonnative, commercially raised bumble bees 
to naturalize and outcompete native bumble bees for limited resources 
such as nesting sites and forage areas. Five commercially reared 
eastern bumble bee workers and one queen were captured in the wild near 
greenhouses where commercial bumble bees are used, suggesting this 
species may have naturalized outside of its native range. The eastern 
bumble bee, which has a native range in eastern North America, was 
detected in western Canada (Ratti and Colla 2010, pp. 29-31). In Japan, 
nonnative buff-tailed bumble bee colonies founded by bees that had 
escaped from commercially produced colonies had more than four times 
the mean reproductive output of native bumble bees (Matsumura et al. 
2004, p. 93). In England, commercially raised buff-tailed bumble bee 
colonies had higher nectar-foraging rates and greater reproductive 
output than a native subspecies of the buff-tailed bumble bee (Ings et 
al. 2006, p. 940). Colonies of eastern bumble bee were imported to 
pollinate agricultural crops and strawberries in Grants Pass, Oregon, 
in the range of the Franklin's bumble bee (Xerces Society and Thorp 
2010, p. 18).
    Although nonnative Bombus species in the range of Franklin's bumble 
bee could outcompete Franklin's bumble bee for floral resources and 
nesting habitat, we have no information to definitively connect 
competition with

[[Page 47230]]

nonnative bumble bees to the decline of the Franklin's bumble bee. 
Furthermore, invertebrate surveys in Franklin's bumble bee habitat 
continue to show evidence of healthy populations of other native Bombus 
species unaffected by competition from nonnative bees (Pool 2014, 
entire; Colyer 2016, entire).
Summary
    We find that several natural and other human-caused factors 
contributed to the decline of the Franklin's bumble bee. While it is 
unlikely that pesticides alone can account for the decline of the 
Franklin's bumble bee, documented effects of pesticides on closely 
related Bombus species suggest pesticide use was likely a factor in the 
decline of the Franklin's bumble bee. The haplodiploid genetic system 
of the Franklin's bumble bee, combined with its historically small 
population size, was also likely a factor in the decline of the 
species. Although nonnative Bombus species in the range of the 
Franklin's bumble bee could outcompete the Franklin's bumble bee for 
floral resources and nesting habitat, we have no information connecting 
competition with nonnative bumble bees to the decline of the Franklin's 
bumble bee. Additionally, surveys in Franklin's bumble bee habitat 
continue to show evidence of healthy populations of other native Bombus 
species unaffected by competition from nonnative bees.

Synergistic and Cumulative Effects

    It is likely that several threats are acting cumulatively and 
synergistically on many Bombus species, including the Franklin's bumble 
bee (Goulson et al. 2015, p. 5), and the combination of multiple 
threats is likely more harmful than any one acting alone (Gill et al. 
2012, p. 108; Coors and DeMeester 2008, p. 1821; Sih et al. 2004, p. 
274). There is recent evidence that the interactive effects of 
pesticides and pathogens could be particularly harmful for bumble bees 
(Service 2018a, p. 39). Nutritional stress may compromise the ability 
of bumble bees to survive parasitic infections (Brown et al. 2000, pp. 
424-425). Bumble bees with activated immunity may have metabolic costs, 
such as increased food consumption (Tyler et al. 2006, p. 2; Moret and 
Schmid-Hempel 2000, pp. 1166-1167). Additionally, exposure to 
pesticides may increase with increased food consumption in infected 
bees (Goulson et al. 2015, p. 5). Activating immunity impairs learning 
in bumble bees (Riddell and Mallon 2006; Alghamdi et al. 2008, p. 480). 
Impaired learning is thought to reduce the ability of bees to locate 
floral resources and extract nectar and pollen, therefore exacerbating 
nutritional stresses (Goulson et al. 2015, p. 5). Further, declining 
North American species with low genetic diversity have higher 
prevalence of the pathogen Nosema bombi (Cameron et al. 2011, p. 665). 
In summary, we, therefore, find that pathogens in combination with 
pesticides, as well as pathogens in combination with the effects of 
small population size, may have hastened and amplified the decline of 
the Franklin's bumble bee to a greater degree than any one of the three 
threats would cause on its own.

Existing Regulatory Mechanisms and Conservation Efforts

    Surveys conducted by Dr. Robbin Thorp, other private individuals, 
university classes and researchers, the U.S. Forest Service, and Bureau 
of Land Management have significantly contributed to the existing 
information on Franklin's bumble bee. However, other than those search 
efforts, we are aware of no conservation efforts or beneficial actions 
specifically taken to address threats to the Franklin's bumble bee. 
Oregon does not include invertebrates on their State endangered species 
list (Oregon Department of Fish and Wildlife 2018, entire) and 
California has no bee species included on its list of threatened and 
endangered invertebrates (California Department of Fish and Wildlife 
2018, entire). California has the Franklin's bumble bee listed on its 
list of terrestrial and vernal pool invertebrates of conservation 
priority but has no required actions or special protections associated 
with the listing (California Department of Fish and Wildlife 2017, p. 
10). The Franklin's bumble bee is on the species index for the U.S. 
Forest Service and Bureau of Land Management Interagency Special 
Status/Sensitive Species Program (ISSSSP). Although the Federal 
agencies include the species in survey efforts and conduct general 
meadow enhancement activities, there are no actions resulting from the 
ISSSSP classification that address known threats to the Franklin's 
bumble bee (ISSSSP 2018, entire).
    General awareness of colony collapse disorder and increase of 
conservation efforts for pollinators in general has likely had limited, 
indirect effects on policies and regulations. The U.S. Forest Service 
is working to include a section in all biological evaluations to 
address the effects from agency actions on pollinators. In addition, 
the Rogue River-Siskiyou National Forest is implementing ongoing 
projects and mitigations to create and enhance pollinator habitat 
(Colyer 2018, pers. comm.). The Oregon Department of Agriculture 
restricts some potential sources of Nosema bombi from entering the 
State for agricultural uses, including commercially produced colonies 
of eastern bumble bee; only Bombus species native to Oregon are allowed 
for commercial pollination purposes (Oregon Department of Agriculture 
2017, p. 5). However, California allows, with appropriate permits, the 
importation of eastern bumble bee, and other species such as the blue 
orchard bee (Osmia lignaria), for greenhouse pollination (California 
Department of Food and Agriculture 2017), making the potential for 
pathogen spillover from nonnative bees higher in California.
    Some local municipalities in Oregon enacted legislation against 
aerial pesticide applications but none in the range of the Franklin's 
bumble bee (Powell 2017, p. 1; City of Portland 2015, p. 2). However, 
in the 2017 legislative session, Oregon passed an Avoidance of Adverse 
Effects on Pollinating Insects law (Oregon Revised Statutes (ORS) 
634.045) that is providing enhanced training of licensed and unlicensed 
pesticide applicators in the State (Melathopoulos 2018, pers. comm.), 
and could thereby reduce effects of pesticides on pollinators, 
including Franklin's bumble bee.
    In January 2017, the U.S. Environmental Protection Agency's Office 
of Pesticide Programs published their ``Policy to Mitigate the Acute 
Risk to Bees from Pesticide Products,'' which recommended new labeling 
statements for pesticide products, including warnings for pesticides 
with a known acute toxicity to bees (Tier 1 pesticides), including 
neonicotinoids (specifically including imidacloprid, clothianidin, and 
thiamethoxam) (U.S. Environmental Protection Agency 2017, p. 31). In 
addition, the Environmental Protection Agency is working with State and 
Tribal agencies to develop and implement local pollinator protection 
plans, known as Managed Pollinator Protection Plans (MP3s). The 
Environmental Protection Agency is promoting MP3s to address potential 
pesticide exposure to bees and other pollinators at and beyond the site 
of the application. However, States and Tribes have the flexibility to 
determine the scope of pollinator protection plans that best responds 
to pollinator issues in their regions. For example, State and Tribal 
MP3s may address pesticide-related risks to all pollinators, including 
managed bees and wild insect and non-insect pollinators (U.S. 
Environmental Protection Agency 2018). The Service implemented a ban on 
the use of

[[Page 47231]]

neonicotinoids on all lands in the National Wildlife Refuge System in 
2014 (Service 2014); however, no refuge lands occur within the range of 
the Franklin's bumble bee, and the Service rescinded the ban in 2018 
(Service 2018b, entire). None of these aforementioned regulatory or 
conservation measures has appreciably reduced or fully ameliorated 
threats to the Franklin's bumble bee, as evidenced by the species' 
acute and rangewide decline.
    We note that, by using the SSA framework to guide our analysis of 
the scientific information documented in the SSA report, we have not 
only analyzed individual effects on the species, but we have also 
analyzed their potential cumulative effects. We incorporate the 
cumulative effects into our SSA analysis when we characterize the 
current and future condition of the species. Our assessment of the 
current status of the Franklin's bumble bee incorporates the threats 
individually and cumulatively. Our assessment is iterative because it 
accumulates and evaluates the effects of all the factors that may be 
influencing the species, including threats and conservation efforts. 
Because the SSA framework considers not just the presence of the 
factors, but to what degree they collectively influence risk to the 
entire species, our assessment integrates the cumulative effects of the 
factors and replaces a standalone cumulative effects analysis.

Summary of Status

    The significant decrease in abundance and distribution of the 
Franklin's bumble bee to date has greatly reduced the species' ability 
to adapt to changing environmental conditions and to guard against 
further losses of adaptive diversity and potential extinction due to 
catastrophic events. It also substantially reduced the ability of the 
Franklin's bumble bee to withstand environmental variation, 
catastrophic events, and changes in physical and biological conditions. 
Coupled with the increased risk of extirpation due to the interaction 
of reduced population size and the species' haplodiploid genetic 
system, the Franklin's bumble bee may lack the resiliency required to 
sustain populations into the future, even without further exposure to 
pathogens and pesticides.

Summary of Comments and Recommendations

    In our proposed rule published on August 13, 2019 (84 FR 40006), we 
requested that all interested parties submit written comments on the 
proposal by October 15, 2019. All comments we received are posted at 
https://www.regulations.gov under Docket No. FWS-R1-ES-2018-0044. We 
contacted appropriate Federal and State agencies (in both Oregon and 
California), scientific experts and organizations, and other interested 
parties and invited them to comment on the proposal, even if they 
previously provided peer or partner review comments on the SSA report. 
We did not receive any additional comments from individuals or agencies 
who had previously provided peer review or partner review on the SSA 
report. We did not receive any requests for a public hearing. We 
reviewed all comments for substantive issues and new information 
regarding the Franklin's bumble bee. During the comment period, we 
received 53 letters or statements directly addressing the proposed 
action, including one comment with 15,749 signatures (supporting the 
listing of the Franklin's bumble bee). All but one of the commenters 
supported the listing of the Franklin's bumble bee as endangered. All 
but one of the commenters disagreed with our determination that 
designating critical habitat is not prudent. Substantive comments we 
received during the comment period are addressed below and, where 
appropriate, are incorporated directly into this final rule.

Public Comments

    (1) Comment: Several commenters disagreed with our conclusion that 
Franklin's bumble bees are habitat generalists. Commenters stated that 
the limited range of the species demonstrates that it is only found in 
specific habitats and that if the species was truly a habitat 
generalist, it would be expected to have a much larger range. They 
noted that the range of the species is limited to the Siskiyou 
Mountains, a subset of the Klamath Mountain region of southern Oregon 
and southwestern California, and that there are specific 
characteristics of Franklin's bumble bee habitat in that area that can 
be identified, such as montane meadows rich in lupine, California 
poppy, mountain monardella, and clover. Commenters note that the 
Siskiyou Range is known for its high number of endemic species and 
these other endemic species are not considered habitat generalists.
    Our Response: As stated in the SSA report, our analyses are 
predicated on multiple assumptions due to the significant lack of 
species-specific information for Franklin's bumble bee (2018a, p. 6). 
We further note that for the purposes of the analyses in the SSA 
report, we rely heavily on information from closely-related species 
from the same sub-genus, Bombus sensu stricto, particularly the rusty 
patched bumble bee and the western bumble bee. The range of the western 
bumble bee completely overlaps the historical range of Franklin's 
bumble bee, and the western bumble bee is still found at several known 
Franklin's bumble bee locations, most recently in 2019 at Mt. Ashland, 
the last known location of Franklin's bumble bee. As mentioned in the 
August 13, 2019, proposed rule (84 FR 40006) and the SSA report, a 
specific habitat study for the species has not been completed, nor have 
the specific life-history characteristics and behavior of this rare 
species been studied. Despite uncertainties regarding the Franklin's 
bumble bee's habitat needs, we know they need (1) floral resources for 
nectaring throughout the colony cycle, and (2) relatively protected 
areas for breeding and shelter. The habitat elements appearing to 
fulfill those needs that have documented use by the Franklin's bumble 
bee are relatively plentiful and widely distributed.
    In our expert elicitation, we asked the following question: In 
looking at the distribution map of all known occurrences of Franklin's 
bumble bee, are there areas in Douglas, Jackson, Josephine, Siskiyou, 
and Trinity Counties in addition to these occurrence sites that might 
contain the species' known foraging plants: Lupine (Lupinus spp.), 
California poppy (Eschscholzia californica), horsemint or nettle-leaf 
giant hyssop (Agastache urticifolia), and mountain monardella 
(Monardella odoratissima)? Dr. Thorp (the preeminent authority on 
Franklin's bumble bee) responded that he was ``trying to figure out 
what defined or limited habitat at the time that [the species] 
disappeared.'' Dr. Thorp noted that the species had historically ranged 
from 500 ft in elevation at Sutherland to over 6,700 ft at Mt. Shasta 
and Mt. Ashland, meaning they could go through multiple mountain passes 
to extend east or south, but they did not; they were not limited by 
geography. Further, they were also not limited by flowering plants; 
they are generalist foragers (Thorp 2018, pers. comm). In addition, 
bumble bees ``are classic generalist foragers, capable of working a 
wide variety of plants for their resources'' (Williams et al. 2014, p. 
15). The historical record also suggests the Franklin's bumble bee may 
use a variety of nesting substrates given that a colony was found in a 
residential garage in Medford, Oregon (Thorp 2017, pers. comm.).

[[Page 47232]]

    We agree that the Klamath-Siskiyou ecoregion, which hosts much of 
the historical range of the Franklin's bumble bee, is very diverse and 
relatively rich in endemic species. The Klamath-Siskiyou ecoregion is 
considered a global center of biodiversity, is an International Union 
for Conservation of Nature (IUCN) Area of Global Botanical Significance 
(1 of 7 in North America), and is proposed as a World Heritage Site and 
United Nations Educational, Scientific and Cultural Organization 
(UNESCO) Biosphere Reserve (World Wildlife Fund 2020, entire). 
Extensive literature is available describing some of the biologic 
investigations in this ecoregion (University of Oregon 2020, entire). 
However, we are not aware of any information linking Franklin's bumble 
bee exclusively to endemic habitat features, including floral resources 
specific to this ecosystem.
    (2) Comment: One commenter noted that forage is only one component 
of Franklin's bumble bee's niche and does not alone define a habitat 
generalist, citing Devictor et al. 2010. They stated that even if the 
species is a general forager it could still have a relatively narrow 
habitat niche, adding that narrow pollen diets are associated with 
other rare bumble bees like Franklin's bumble bee. They referenced a 
recent study, Wood et al. 2019, that looked at the diets of two species 
closely related to Franklin's bumble bee, the American bumble bee and 
rusty patch bumble bee, and found these declining species had a narrow 
pollen diet, collecting around one-third fewer pollen types than other 
more stable species. The study further noted that these two species are 
short-tongued and the anatomical feature was mentioned as a potential 
factor in their narrower diet.
    Our Response: There are many factors related to Franklin's bumble 
bees and their habitat that we do not yet, and may never, understand; 
however, the information gathered for our assessment, including the 
opinion of the preeminent authority on the species (Dr. Robbin Thorp), 
indicates that Franklin's bumble bee is likely a habitat generalist. 
The commenter cites Devictor et al. 2010, when noting forage is only 
one component of Franklin's bumble bee's niche and may not alone define 
a habitat generalist. However, the same paper also states that a 
measure of ecological specialization is the assumption that specialists 
should co-occur with relatively few species; this is in contrast to 
generalist species who should co-occur with many different species 
across sites (Devictor et al. 2010, p. 23), as has been observed with 
Franklin's bumble bees.
    We agree that narrow pollen diets likely play a role in the decline 
of some Bombus species as the distribution and abundance of their 
floral resources change, but we do not have sufficient information to 
determine if this was a significant causal factor in the decline of the 
Franklin's bumble bee. We do have some records of the species of plants 
visited by Franklin's bumble bee, but we do not have an exhaustive or 
comprehensive list. Of the plants Franklin's bumble bee is known to 
use, many are widely distributed. For example, California poppy is 
found in Oregon, Washington, Nevada, Arizona, Minnesota, and 
northwestern Baja California, Mexico. Nettle-leaf giant hyssop (horse 
mint) is native throughout western North America from British Columbia 
in Canada, to California to Colorado, where it grows in a wide variety 
of habitat types. Mountain monardella is found in montane forests 
between 600 m and 3,100 m (1,969 ft and 10,170 ft) in elevation in 
Oregon, Washington, Nevada, and Utah. Regarding tongue length, although 
the Franklin's bumble bee is a short-tongued species, Wood et al. found 
no evidence of tongue length as a predictor of dietary breadth (2019, 
p. 9).
    (3) Comment: Several commenters disagreed that the present or 
threatened destruction, modification, or curtailment of habitat is not 
a threat to the Franklin's bumble bee. One commenter stated that the 
Service analyzed fire suppression, agricultural intensification, urban 
development, livestock grazing, and effects of climate change, but only 
as to whether they contributed to the historical decline of Franklin's 
bumble bee, not as current threats. One commenter stated that the 
climate change effects of increased drought severity, wildfire risk, 
and winter or early season flood risk are clear threats to Franklin's 
bumble bee habitat in the current and near future; they noted that 
flood risk is especially concerning for overwintering hibernating 
queens who may suffer mortality or respond by emerging too early for 
floral resources. The commenter also noted that due to the myriad of 
threats outlined in the August 13, 2019, proposed rule (84 FR 40006), 
it is incorrect to conclude that Franklin's bumble bee's habitat is 
unlimited in its capacity to provide uncontaminated resources to the 
species. One commenter stated that all-terrain vehicle (ATV) use and 
herbicide use are current threats to Franklin's bumble bee's habitat, 
but provided no additional information upon which to base those claims.
    Our Response: In our analysis of the threats facing Franklin's 
bumble bee in the SSA report, we completed a review of the best 
available scientific and commercial information on threats that have 
been present in the range of the bee (Service 2018a, pp. 23-40). During 
the public comment period on the proposed rule we did not receive any 
new information regarding potential threats that prompted us to change 
the conclusions in our analysis. The viability analysis takes into 
account the threats to the species that have influenced historical 
populations, threats that are influencing the current condition of 
populations, and threats which are likely to play a role in the 
species' overall viability into the future. In our SSA report for 
Franklin's bumble bee, we noted those threats that are likely to play a 
role in the future (pathogens, pesticides, and the synergistic effects 
of small population size), but did not complete a full future condition 
analysis; the dearth of information on this species, particularly the 
lack of species occurrence information after 2006, limited our ability 
to compare current and future condition.
    Although empirical data are currently unavailable regarding the 
level of habitat loss and degradation specifically affecting the 
Franklin's bumble bee, we do know that habitat impacts have caused the 
decline of other Bombus species (e.g., Goulson et al. 2015, p. 2; 
Goulson and Darvill 2008, pp. 193-194; Brown and Paxton 2009, pp. 411-
412). Although habitat loss has had negative effects on Bombus species 
in general, available information did not indicate it was a driver of 
the decline of Franklin's bumble bee. Habitat appears generally intact 
and in good condition throughout the known historical locations of the 
Franklin's bumble bee and in all recent focused survey areas, and many 
of these habitats currently host a wide variety of other bumble bees, 
including closely-related species like the western bumble bee. As noted 
above in Summary of Biological Status and Threats, we have no 
information to suggest that any known Franklin's bumble bee locations 
were in the path of wildfire at the time those locations were occupied. 
Further, as made evident in our geographic information system (GIS) 
analysis, most of the recent locations with confirmed Franklin's bumble 
bee observations are on publicly owned land that is managed to preserve 
habitat conditions through a variety of mechanisms, including fire 
suppression. Furthermore, we have no information to suggest that 
habitat destruction or modification from fire

[[Page 47233]]

suppression, agricultural intensification, urban development, and 
livestock grazing will increase in intensity to the point where they 
will be threats to the viability of the species in the future (Bureau 
of Land Management 2016, p. 103; Portland State University 2015, p. 7; 
U.S. Forest Service 1989, IV-87 to IV-90, IV-113 to IV-119; U.S. Forest 
Service 1990, pp. 4-149 to 4-179; Service 2018a, p. 32).
    Future changes in temperature and precipitation may lead to changes 
in the vegetation community in Franklin's bumble bee habitat. However, 
as a habitat generalist, Franklin's bumble bee appears to forage on a 
variety of floral resources, and we have no information to suggest that 
they would not seek the nectar of whatever floral resource was in bloom 
at the time they emerge from their nests. Additionally, the risk of 
catastrophic wildfire and seasonal flooding, as well as other effects 
from storm events, are naturally present in the ecosystems within the 
range of the Franklin's bumble bee. The effects of climate change may 
affect the frequency and intensity of these events, thereby affecting 
the availability of floral resources, the suitability of nest 
locations, and the survival of overwintering queens. However, we cannot 
project the likelihood of when or where these events will occur, or how 
intense they will be if they do occur.
    We agree that Franklin's bumble bee habitat is not unlimited. As we 
point out in the beginning of the SSA report, Franklin's bumble bee is 
the most narrowly endemic bumble bee in North America, and possibly the 
world. In accordance with listing Franklin's bumble bee as endangered 
under the Act, we will develop a recovery outline for this species. 
Current and possible future threats will be considered during recovery 
planning for this species.
    (4) Comment: One commenter disagreed that critical habitat could 
not be defined. They point to our proposed rule, which states that 
surveys have been done in areas that appear to have good habitat for 
Bombus and Franklin's bumble bee, as evidence that there are known and 
defined characteristics of potential critical habitat in previously 
occupied areas.
    Our Response: While we acknowledge that some general habitat 
associations of Bombus are known, the Franklin's bumble bee has been 
found in a wide array of habitat types, from foraging in montane 
meadows in a remote wilderness area of California to nesting in a 
residential garage in the city limits of Medford, Oregon. Furthermore, 
elevation does not appear to limit the species' dispersal capabilities. 
No habitat study for the Franklin's bumble bee has been completed; such 
a study was initiated in 2006, when the Franklin's bumble bee was last 
seen, but could not continue due to the subsequent absence of the 
species. As such, we cannot with specificity articulate the physical or 
biological features essential to the conservation of the Franklin's 
bumble bee, or determine whether or not any area would meet the 
definition of critical habitat for the Franklin's bumble bee (see 
discussion under Prudency Determination, below).
    Even if physical and biological features can be articulated for the 
species, the regulations in effect at the time the species was proposed 
for listing indicated that we may find that designating critical 
habitat is not prudent if it is not beneficial to the species. With the 
exception of the inundation of two sites with older historical 
occurrences of Franklin's bumble bee locations by the construction of 
Applegate Dam, and a report of soil modification on a portion of the 
Gold Hill site 4 years after the last occurrence of Franklin's bumble 
bee in the area, no noticeable destruction, modification, or 
curtailment of habitat or range can be identified in areas where the 
species had been previously located. No significant destruction or 
modification of Franklin's bumble bee habitat can be attributed to 
natural fire, prescribed fire, agricultural intensification, urban 
development, livestock grazing, or the effects of climate change. 
Additionally, as discussed above, the Franklin's bumble bee has been 
documented using a wide variety of habitats throughout its range. 
Because habitat for the Franklin's bumble bee is not limiting, and 
because the bee is considered to be flexible with regards to its 
habitat, the availability of habitat does not limit the conservation of 
the Franklin's bumble bee now, nor will it in the future (see response 
to Comment (3)). Therefore, we have determined that designation of 
critical habitat for the Franklin's bumble bee is not beneficial to the 
species and, therefore, not prudent.
    (5) Comment: Two commenters disagreed that the designation of 
critical habitat would not be beneficial to the conservation of the 
species. They argue it would be beneficial due to the following: (1) 
Critical habitat would promote connectivity between habitat patches, 
which will help reduce the risk of inbreeding depression and promote 
recovery of the species; (2) many studies have shown the link between 
quality habitat and nutrition and health of bumble bee colonies, and 
critical habitat would be beneficial because it would give Franklin's 
bumble bee access to more high-quality habitat to combat the threats of 
pathogens and pesticides and to recover from them; (3) competition and 
disease from nonnative honey bees, as well as pesticides from both 
agriculture and siliviculture, are threats that will be unregulated 
without the designation of critical habitat; (4) critical habitat would 
provide concrete objective locations in which to protect the species 
through section 7 of the Act; and (5) critical habitat would inform the 
species recovery plan and where exactly the Service would implement 
recovery actions to ameliorate threats to the species.
    Our Response: The implementing regulations of the Act upon which 
the August 13, 2019, proposed rule (84 FR 40006) and this final rule 
are based set forth that the factors the Service may consider in 
determining that a critical habitat designation would not be prudent 
include, but are not limited to, whether the species is threatened by 
taking or other human activity, and identification of critical habitat 
can be expected to increase the degree of threat to the species; or 
whether such designation of critical habitat would not be beneficial to 
the species (50 CFR 424.12(a)(1)). We determine that the designation of 
critical habitat would not be beneficial to the species because the 
present or threatened destruction, modification, or curtailment of the 
species' habitat or range (Factor A) is not a threat to the Franklin's 
bumble bee and because we cannot with specificity articulate the 
physical or biological features essential to the conservation of the 
Franklin's bumble bee, or determine whether or not any area would meet 
the definition of critical habitat for the Franklin's bumble bee (see 
discussion under Prudency Determination, below).
    As mentioned in our response to Comments (3) and (4), no noticeable 
destruction, modification, or curtailment of Franklin's bumble bee 
habitat or range can be identified in areas where the species had been 
previously located, and could not be shown to have affected the 
resiliency of any population of Franklin's bumble bee. None of the 
potential threats to Franklin's bumble bee habitat we assessed appears 
to threaten the viability of the species (USFWS 2018a, pp. 23-41). 
Therefore, we find that because the present or threatened destruction, 
modification, or curtailment of a species' habitat or range is not a 
threat to Franklin's bumble bee, designating critical habitat is not 
beneficial and, therefore, not prudent.
    Furthermore, regarding section 7 consultation, because of the 
listing of

[[Page 47234]]

the species (absent critical habitat), Federal agencies will still be 
required to consult under section 7 of the Act on activities that may 
affect this species in areas where the Franklin's bumble bee is 
reasonably certain to occur. The Federal action agency will be required 
to identify any listed species that could be within the project area of 
any proposed activity, and consult with the Service if that activity is 
likely to adversely affect the species.

Determination of the Status of Franklin's Bumble Bee

    Section 4 of the Act (16 U.S.C. 1533) and its implementing 
regulations (50 CFR part 424) set forth the procedures for determining 
whether a species meets the definition of an endangered species or a 
threatened species. The Act defines an ``endangered species'' as a 
species that is ``in danger of extinction throughout all or a 
significant portion of its range,'' and a ``threatened species'' as a 
species that is ``likely to become an endangered species within the 
foreseeable future throughout all or a significant portion of its 
range.'' The Act requires that we determine whether a species meets the 
definition of ``endangered species'' or ``threatened species'' because 
of any of the following factors: (A) The present or threatened 
destruction, modification, or curtailment of its habitat or range; (B) 
overutilization for commercial, recreational, scientific, or 
educational purposes; (C) disease or predation; (D) the inadequacy of 
existing regulatory mechanisms; or (E) other natural or manmade factors 
affecting its continued existence.

Status Throughout All of Its Range

    We evaluated the past, present, and future threats to the 
Franklin's bumble bee and assessed the cumulative effect of the threats 
under the Act's section 4(a)(1) factors. Our assessment did not find 
habitat loss or modification (Factor A) to be the cause of the decline 
of the Franklin's bumble bee, and we have no information to suggest 
that habitat destruction or modification will increase in intensity in 
the near future. There is no indication that the Franklin's bumble bee 
was at risk of overutilization for commercial, recreational, 
scientific, or educational purposes (Factor B). Known pathogens occur 
within the historical range of the Franklin's bumble bee, and we have 
evidence of several pathogens (Factor C) infecting closely related 
species within that range. Although we do not have direct evidence of 
pathogens playing a role in the decline of the Franklin's bumble bee, 
the disappearance of the Franklin's bumble bee occurred soon after a 
period of introduction of new pathogens. Furthermore, documented 
effects to other closely related species lead many species experts to 
suspect that the effects of pathogens had some connection to the 
decline of the Franklin's bumble bee. We evaluated existing regulatory 
mechanisms (Factor D) and conservation measures and their effects on 
the threats and the status of the Franklin's bumble bee; we found that 
the existing regulatory mechanisms or conservation measures in place do 
not appreciably reduce or ameliorate the existing threats to the 
species, as evidenced by the species' acute and rangewide decline. 
Although we have no direct evidence that pesticide use contributed to 
the decline of the Franklin's bumble bee, confirmed effects to other 
closely related Bombus species suggest that pesticide use (Factor E) 
was likely a factor in the decline of the Franklin's bumble bee. 
Additionally, given the historically small population size (Factor E) 
of the Franklin's bumble bee and its haplodiploid genetic system, it is 
more vulnerable to extirpation than other species, and it is likely the 
genetic system and the rarity of this species contributed to the 
decline of the Franklin's bumble bee (Factor E).
    The combination of multiple threats is typically more harmful than 
any one acting alone, and it is likely that several of the threats 
mentioned above acted cumulatively and synergistically on the 
Franklin's bumble bee. Pathogens in combination with pesticides, as 
well as pathogens in combination with the effects of small population 
size, may have hastened and amplified the decline of the Franklin's 
bumble bee to a greater degree than any one of the three factors caused 
on its own. Although the ultimate source of the decline is unknown, the 
acute and rangewide decline of the Franklin's bumble bee is 
undisputable.
    The Act defines an ``endangered species'' as any species that is in 
danger of extinction throughout all or a significant portion of its 
range, and a ``threatened species'' as any species that is likely to 
become endangered within the foreseeable future throughout all or a 
significant portion of its range. We find that, based on the severity 
and immediacy of threats currently affecting the species, the 
Franklin's bumble bee meets the definition of an endangered species. 
The threats of pathogens, pesticides, and small population size are 
ongoing and rangewide; they will continue to act individually and in 
combination to decrease the resiliency, redundancy, and representation 
of the Franklin's bumble bee. The risk of extinction is high because 
the species has not been found since 2006, and the suspected threats to 
the species persist. We find that a threatened species status is not 
appropriate for the Franklin's bumble bee because of the extreme loss 
of abundance of the species, because the threats are occurring 
rangewide and are not localized, and because the threats are ongoing 
and expected to continue into the future. Thus, after assessing the 
best available information, we determine that the Franklin's bumble bee 
is in danger of extinction throughout all of its range.

Status Throughout a Significant Portion of Its Range

    Under the Act and our implementing regulations, a species may 
warrant listing if it is in danger of extinction or likely to become so 
in the foreseeable future throughout all or a significant portion of 
its range. We have determined that the Franklin's bumble bee is in 
danger of extinction throughout all of its range and accordingly did 
not undertake an analysis of whether there are any significant portions 
of its range. Because Franklin's bumble bee warrants listing as 
endangered throughout all of its range, our determination is consistent 
with the decision in Center for Biological Diversity v. Everson, 2020 
WL 437289 (D.D.C. Jan. 28, 2020), in which the court vacated only the 
aspect of our July 1, 2014, Final Policy on Interpretation of the 
Phrase ``Significant Portion of Its Range'' in the Endangered Species 
Act's Definitions of ``Endangered Species'' and ``Threatened Species'' 
(79 FR 37578) that provided the Services do not undertake an analysis 
of significant portions of a species' range if the species warrants 
listing as threatened throughout all of its range.

Determination of Status

    Our review of the best available scientific and commercial 
information indicates that the Franklin's bumble bee meets the 
definition of an endangered species. Therefore, we are listing the 
Franklin's bumble bee as an endangered species in accordance with 
sections 3(6) and 4(a)(1) of the Act. Although this species has not 
been observed since 2006, we conclude it is premature at this time to 
determine that the species is extinct absent a more thorough survey 
effort. We recommend expanded survey efforts to help verify the status 
of this species.

[[Page 47235]]

Available Conservation Measures

    Conservation measures provided to species listed as endangered or 
threatened species under the Act include recognition, recovery actions, 
requirements for Federal protection, and prohibitions against certain 
practices. Recognition through listing results in public awareness, and 
conservation by Federal, State, Tribal, and local agencies; private 
organizations; and individuals. The Act encourages cooperation with 
States and other countries and calls for recovery actions to be carried 
out for listed species. The protection required by Federal agencies and 
the prohibitions against certain activities are discussed, in part, 
below.

Recovery Actions

    The primary purpose of the Act is the conservation of endangered 
and threatened species and the ecosystems upon which they depend. The 
ultimate goal of such conservation efforts is the recovery of these 
listed species, so that they no longer need the protective measures of 
the Act. Subsection 4(f) of the Act calls for the Service to develop 
and implement recovery plans for the conservation of endangered and 
threatened species. The recovery planning process involves the 
identification of actions that are necessary to halt or reverse a 
species' decline by addressing the threats to its survival and 
recovery. The goal of this process is to restore listed species to a 
point where they are secure, self-sustaining, and functioning 
components of their ecosystems.
    Recovery planning includes the development of a recovery outline 
shortly after a species is listed, and preparation of a draft and final 
recovery plan. The recovery outline guides the immediate implementation 
of urgent recovery actions and describes the process we will use to 
develop a recovery plan. Revisions of the plan may be done to address 
continuing or new threats to the species, as new substantive 
information becomes available. The recovery plan also identifies 
recovery criteria for review of when a species may be ready for 
reclassification from endangered to threatened (``downlisting'') or 
removal from protected status (``delisting''), and methods for 
monitoring recovery progress. Recovery plans also establish a framework 
for agencies to coordinate their recovery efforts and provide estimates 
of the cost of implementing recovery tasks. Recovery teams (composed of 
species experts, Federal and State agencies, nongovernmental 
organizations, and stakeholders) are often established to develop 
recovery plans. When completed, the recovery outline, draft recovery 
plan, and the final recovery plan will be available on our website 
(https://www.fws.gov/endangered), or from our Oregon Fish and Wildlife 
Office (see FOR FURTHER INFORMATION CONTACT).
    Implementation of recovery actions generally requires the 
participation of a broad range of partners, including other Federal 
agencies, States, Tribes, nongovernmental organizations, businesses, 
and private landowners. Examples of recovery actions include habitat 
restoration (e.g., restoration of native vegetation), research, captive 
propagation and reintroduction, and outreach and education. The 
recovery of many listed species cannot be accomplished solely on 
Federal lands because their range may occur primarily or solely on non-
Federal lands. To achieve recovery of these species requires 
cooperative conservation efforts on private, State, and tribal lands.
    Following publication of this final listing rule, funding for 
recovery actions will be available from a variety of sources, including 
Federal budgets, State programs, and cost share grants for non-Federal 
landowners, the academic community, and nongovernmental organizations. 
In addition, pursuant to section 6 of the Act, the States of Oregon and 
California will be eligible for Federal funds to implement management 
actions that promote the protection or recovery of the Franklin's 
bumble bee. Information on our grant programs that are available to aid 
species recovery can be found at: https://www.fws.gov/grants.
    Please let us know if you are interested in participating in 
recovery efforts for the Franklin's bumble bee. Additionally, we invite 
you to submit any new information on this species whenever it becomes 
available and any information you may have for recovery planning 
purposes (see FOR FURTHER INFORMATION CONTACT).

Regulatory Provisions

    Section 7(a) of the Act requires Federal agencies to evaluate their 
actions with respect to any species that is proposed or listed as an 
endangered or threatened species and with respect to its critical 
habitat, if any is designated. Regulations implementing this 
interagency cooperation provision of the Act are codified at 50 CFR 
part 402. Section 7(a)(2) of the Act requires Federal agencies to 
ensure that activities they authorize, fund, or carry out are not 
likely to jeopardize the continued existence of any endangered or 
threatened species or destroy or adversely modify its critical habitat. 
If a Federal action may affect a listed species or its critical 
habitat, the responsible Federal agency must enter into consultation 
with the Service.
    Federal agency actions within the species' habitat that may require 
conference or consultation or both include management and any other 
landscape-altering activities on Federal lands administered by the U.S. 
Forest Service and Bureau of Land Management, the National Park 
Service, and the Bureau of Reclamation; technical assistance and 
projects funded through the U.S. Department of Agriculture Natural 
Resources Conservation Service; issuance of section 404 Clean Water Act 
(33 U.S.C. 1251 et seq.) permits by the U.S. Army Corps of Engineers, 
and construction and maintenance of roads or highways by the Federal 
Highway Administration.
    The Act and its implementing regulations set forth a series of 
general prohibitions and exceptions that apply to endangered wildlife. 
The prohibitions of section 9(a)(1) of the Act, codified at 50 CFR 
17.21, make it illegal for any person subject to the jurisdiction of 
the United States to take (which includes harass, harm, pursue, hunt, 
shoot, wound, kill, trap, capture, or collect; or to attempt any of 
these) endangered wildlife within the United States or on the high 
seas. In addition, it is unlawful to import; export; deliver, receive, 
carry, transport, or ship in interstate or foreign commerce in the 
course of commercial activity; or sell or offer for sale in interstate 
or foreign commerce any species listed as an endangered species. It is 
also illegal to possess, sell, deliver, carry, transport, or ship any 
such wildlife that has been taken illegally. Certain exceptions apply 
to employees of the Service, the National Marine Fisheries Service, 
other Federal land management agencies, and State conservation 
agencies.
    We may issue permits to carry out otherwise prohibited activities 
involving endangered wildlife under certain circumstances. Regulations 
governing permits are codified at 50 CFR 17.22. With regard to 
endangered wildlife, a permit may be issued for the following purposes: 
For scientific purposes, to enhance the propagation or survival of the 
species, and for incidental take in connection with otherwise lawful 
activities. There are also certain statutory exemptions from the 
prohibitions, which are found in sections 9 and 10 of the Act.
    It is our policy, as published in the Federal Register on July 1, 
1994 (59 FR 34272), to identify to the maximum extent practicable at 
the time a species

[[Page 47236]]

is listed, those activities that would or would not constitute a 
violation of section 9 of the Act. The intent of this policy is to 
increase public awareness of the effect of a listing on proposed and 
ongoing activities within the range of the listed species. Based on the 
best available information, the following actions are unlikely to 
result in a violation of section 9 of the Act if these activities are 
carried out in accordance with existing regulations and permit 
requirements; this list is not comprehensive:
    (1) Recreation, specifically skiing at Mt. Ashland, and use of the 
Pacific Crest Trail;
    (2) Timber sales; and
    (3) Livestock grazing.
    Based on the best available information, the following actions may 
potentially result in a violation of section 9 of the Act if they are 
not authorized in accordance with applicable law; this list is not 
comprehensive:
    (1) Unauthorized handling or collecting of the Franklin's bumble 
bee;
    (2) Unauthorized release of biological control agents that attack 
any life stage of the Franklin's bumble bee, including the unauthorized 
use of herbicides, pesticides, or other chemicals in areas in which the 
Franklin's bumble bee is known to occur (i.e., in the Franklin's bumble 
bee's historical range); and
    (3) Unauthorized release of nonnative species or native species 
that carry pathogens, diseases, or fungi that are known or suspected to 
adversely affect the Franklin's bumble bee where the species is known 
to occur (i.e., in the Franklin's bumble bee's historical range).
    Questions regarding whether specific activities would constitute a 
violation of section 9 of the Act should be directed to the Oregon Fish 
and Wildlife Office (see FOR FURTHER INFORMATION CONTACT).

II. Critical Habitat

Background

    Critical habitat is defined in section 3 of the Act as:
    (1) The specific areas within the geographical area occupied by the 
species, at the time it is listed in accordance with the Act, on which 
are found those physical or biological features
    (a) Essential to the conservation of the species, and
    (b) Which may require special management considerations or 
protection; and
    (2) Specific areas outside the geographical area occupied by the 
species at the time it is listed, upon a determination that such areas 
are essential for the conservation of the species.
    Our regulations at 50 CFR 424.02 define ``geographical area 
occupied by the species'' as an area that may generally be delineated 
around species' occurrences, as determined by the Secretary (i.e., 
range). Such areas may include those areas used throughout all or part 
of the species' life cycle, even if not used on a regular basis (e.g., 
migratory corridors, seasonal habitats, and habitats used periodically, 
but not solely by vagrant individuals).
    Conservation, as defined under section 3 of the Act, means to use 
and the use of all methods and procedures that are necessary to bring 
an endangered or threatened species to the point at which the measures 
provided pursuant to the Act are no longer necessary. Such methods and 
procedures include, but are not limited to, all activities associated 
with scientific resources management such as research, census, law 
enforcement, habitat acquisition and maintenance, propagation, live 
trapping, and transplantation, and, in the extraordinary case where 
population pressures within a given ecosystem cannot be otherwise 
relieved, may include regulated taking.
    Critical habitat receives protection under section 7 of the Act 
through the requirement that Federal agencies ensure, in consultation 
with the Service, that any action they authorize, fund, or carry out is 
not likely to result in the destruction or adverse modification of 
critical habitat. The designation of critical habitat does not affect 
land ownership or establish a refuge, wilderness, reserve, preserve, or 
other conservation area. Such designation does not allow the government 
or public to access private lands. Such designation does not require 
implementation of restoration, recovery, or enhancement measures by 
non-Federal landowners. Where a landowner requests Federal agency 
funding or authorization for an action that may affect a listed species 
or critical habitat, the Federal agency would be required to consult 
with the Service under section 7(a)(2) of the Act. However, even if the 
Service were to conclude that the proposed activity would result in 
destruction or adverse modification of the critical habitat, the 
Federal action agency and the landowner are not required to abandon the 
proposed activity, or to restore or recover the species; instead, they 
must implement ``reasonable and prudent alternatives'' to avoid 
destruction or adverse modification of critical habitat.
    Under the first prong of the Act's definition of critical habitat, 
areas within the geographical area occupied by the species at the time 
it was listed are included in a critical habitat designation if they 
contain physical or biological features (1) which are essential to the 
conservation of the species and (2) which may require special 
management considerations or protection. For these areas, critical 
habitat designations identify, to the extent known using the best 
scientific and commercial data available, those physical or biological 
features that are essential to the conservation of the species (such as 
space, food, cover, and protected habitat). In identifying those 
physical or biological features within an area, we focus on the 
specific features that support the life-history needs of the species, 
including, but not limited to, water characteristics, soil type, 
geological features, prey, vegetation, symbiotic species, or other 
features. A feature may be a single habitat characteristic, or a more 
complex combination of habitat characteristics. Features may include 
habitat characteristics that support ephemeral or dynamic habitat 
conditions. Features may also be expressed in terms relating to 
principles of conservation biology, such as patch size, distribution 
distances, and connectivity.
    Under the second prong of the Act's definition of critical habitat, 
we can designate critical habitat in areas outside the geographical 
area occupied by the species at the time it is listed, upon a 
determination that such areas are essential for the conservation of the 
species. We determine whether unoccupied areas are essential for the 
conservation of the species by considering the life-history, status, 
and conservation needs of the species. This is further informed by any 
generalized conservation strategy, criteria, or outline that may have 
been developed for the species to provide a substantive foundation for 
identifying which features and specific areas are essential to the 
conservation of the species and, as a result, to the development of the 
critical habitat designation. For example, an area currently occupied 
by the species but that was not occupied at the time of listing may be 
essential to the conservation of the species and may be included in the 
critical habitat designation.
    Section 4 of the Act requires that we designate critical habitat on 
the basis of the best scientific data available. Further, our Policy on 
Information Standards Under the Endangered Species Act (published in 
the Federal Register on July 1, 1994 (59 FR 34271)),

[[Page 47237]]

the Information Quality Act (section 515 of the Treasury and General 
Government Appropriations Act for Fiscal Year 2001 (Pub. L. 106-554; 
H.R. 5658)), and our associated Information Quality Guidelines, provide 
criteria, establish procedures, and provide guidance to ensure that our 
decisions are based on the best scientific data available. They require 
our biologists, to the extent consistent with the Act and with the use 
of the best scientific data available, to use primary and original 
sources of information as the basis for recommendations to designate 
critical habitat.

Prudency Determination

    Section 4(a)(3) of the Act, as amended, and implementing 
regulations (50 CFR 424.12), require that, to the maximum extent 
prudent and determinable, the Secretary shall designate critical 
habitat at the time the species is determined to be an endangered or 
threatened species.
    On August 27, 2019, the Service published a final rule (84 FR 
45020) revising the regulations at 50 CFR part 424 for listing species 
and designating critical habitat. However, the revisions apply only to 
relevant rulemakings for which the proposed rule is published after 
September 26, 2019, the effective date of the final rule. Thus, the 
prior version of the regulations at 50 CFR part 424 continues to apply 
to any rulemakings for which a proposed rule was published before 
September 26, 2019, including this final rule for Franklin's bumble 
bee.
    The prior version of the regulations at 50 CFR part 424 (50 CFR 
424.12(a)(1)) state that the designation of critical habitat is not 
prudent when one or both of the following situations exist:
    (1) The species is threatened by taking or other human activity, 
and identification of critical habitat can be expected to increase the 
degree of threat to the species, or
    (2) Such designation of critical habitat would not be beneficial to 
the species. In determining whether a designation would not be 
beneficial, the factors the Services may consider includes whether the 
present or threatened destruction, modification, or curtailment of a 
species' habitat or range is not a threat to the species.
    As discussed above in the threats analysis, there is currently no 
imminent threat of take attributed to collection or vandalism 
identified under Factor B for this species, and identification and 
mapping of critical habitat is not expected to initiate any such 
threat. In the absence of finding that the designation of critical 
habitat would increase threats to a species, we next determine whether 
such designation of critical habitat would be beneficial to the 
Franklin's bumble bee. For the reasons discussed below, we have 
determined that designating critical habitat would not be beneficial.
Designating Habitat Would Not Be Beneficial to the Species
    The Franklin's bumble bee was widely distributed throughout its 
range and considered flexible with regard to habitat requirements. We 
know that the Franklin's bumble bee needs (1) floral resources for 
nectaring throughout the colony cycle, and (2) relatively protected 
areas for breeding and shelter. In addition, because the best available 
scientific information indicates that the Franklin's bumble bee is a 
generalist forager, its habitat preferences and needs are relatively 
plentiful and widely distributed. While Bombus species in general might 
prefer protected meadows with an abundance of wildflowers, the 
Franklin's bumble bee has been found in a wide array of habitat types, 
from foraging in montane meadows in a remote wilderness area of 
California to nesting in a residential garage in the city limits of 
Medford, Oregon. The species has a broad elevational range from 162 m 
(540 ft) to 2,340 m (7,800 ft); elevation does not appear to limit the 
species' dispersal capabilities.
    Some general habitat associations of Bombus are known; however, as 
one of the rarest Bombus species, the Franklin's bumble bee is somewhat 
enigmatic and a specific habitat study for the Franklin's bumble bee 
has not been completed. Such a study was initiated in 2006, when the 
Franklin's bumble bee was last seen, but could not continue due to the 
subsequent absence of the species. Therefore, we cannot with 
specificity articulate the physical or biological features essential to 
the conservation of the Franklin's bumble bee, or determine whether or 
not any area would meet the definition of critical habitat for the 
Franklin's bumble bee.
    Since it was first identified in 1921, the Franklin's bumble bee 
appears to have always been a rare species with a limited range. In 
fact, the species has perhaps the most limited range of any Bombus 
species in the world. Nonetheless, Franklin's bumble bee habitat is not 
known to be limiting, and habitat loss is not a threat to the species. 
With the exception of the inundation of two sites with older historical 
occurrences of Franklin's bumble bee (through the construction of 
Applegate Dam, and a report of soil modification on a portion of the 
Gold Hill site 4 years after the last occurrence of Franklin's bumble 
bee in the area), no noticeable destruction, modification, or 
curtailment of habitat or range can be identified in areas where the 
species had been previously located. No significant destruction or 
modification of Franklin's bumble bee habitat can be attributed to 
natural fire, prescribed fire, agricultural intensification, urban 
development, livestock grazing, or the effects of climate change. 
Additionally, as discussed above, the Franklin's bumble bee has been 
documented using a wide variety of habitats throughout its range. 
Because habitat for the Franklin's bumble bee is not limiting, and 
because the bee is considered to be flexible with regards to its 
habitat, the availability of habitat does not limit the conservation of 
the Franklin's bumble bee now, nor will it in the foreseeable future.
    In the Service and National Marine Fisheries Service's response to 
comments on the February 11, 2016, final rule (81 FR 7414) revising the 
critical habitat regulations (the regulations in effect at the time the 
Franklin's bumble bee was proposed for listing), the Services expressly 
contemplated a fact pattern where designating critical habitat may not 
be beneficial to the species: ``[I]n some circumstances, a species may 
be listed because of factors other than threats to its habitat or 
range, such as disease, and the species may be a habitat generalist. In 
such a case, on the basis of the existing and revised regulations, it 
is permissible to determine that critical habitat is not beneficial 
and, therefore, not prudent'' (81 FR 7425). This is the fact pattern we 
are presented with in the case of the Franklin's bumble bee. In view of 
the foregoing, we conclude that present or threatened destruction, 
modification, or curtailment of habitat is not a threat to the 
Franklin's bumble bee; rather, disease and other manmade factors are 
likely the primary threat to the species within its habitat. Therefore, 
in accordance with 50 CFR 424.12(a)(1), we determine that critical 
habitat is not beneficial and, therefore, not prudent for the 
Franklin's bumble bee.

Required Determinations

National Environmental Policy Act (42 U.S.C. 4321 et seq.)

    We have determined that environmental assessments and environmental 
impact statements, as defined under the authority of the National 
Environmental Policy Act (NEPA; 42 U.S.C. 4321 et seq.), need not be 
prepared in connection with listing a species as an endangered or 
threatened species under the

[[Page 47238]]

Endangered Species Act. We published a notice outlining our reasons for 
this determination in the Federal Register on October 25, 1983 (48 FR 
49244).

Government-To-Government Relationship With Tribes

    In accordance with the President's memorandum of April 29, 1994 
(Government-to-Government Relations with Native American Tribal 
Governments; 59 FR 22951), Executive Order 13175 (Consultation and 
Coordination With Indian Tribal Governments), and the Department of the 
Interior's manual at 512 DM 2, we acknowledge our responsibility to 
communicate meaningfully with recognized Federal Tribes on a 
government-to-government basis. In accordance with Secretarial Order 
3206 of June 5, 1997 (American Indian Tribal Rights, Federal-Tribal 
Trust Responsibilities, and the Endangered Species Act), we acknowledge 
our responsibilities to work directly with tribes in developing 
programs for healthy ecosystems, to acknowledge that tribal lands are 
not subject to the same controls as Federal public lands, to remain 
sensitive to Indian culture, and to make information available to 
tribes. On July 17, 2017, as part of our status review process, we sent 
out notification letters to 11 Tribes that are in proximity to the 
known historical range of the Franklin's bumble bee (6 Tribes in Oregon 
and 5 Tribes in California). The letter provided the Tribes early 
notification that were conducting a status review for Franklin's bumble 
bee and solicited their input to ensure that we had the best scientific 
data available to inform our subsequent finding on the status. We did 
not receive a response from any of the Tribes.

References Cited

    A complete list of references cited in this rule is available on 
the internet at https://www.regulations.gov under Docket No. FWS-R1-ES-
2018-0044 and upon request from the Oregon Fish and Wildlife Office 
(see FOR FURTHER INFORMATION CONTACT).

Authors

    The primary authors of this rule are the staff members of the Fish 
and Wildlife Service's Species Assessment Team and the Oregon Fish and 
Wildlife Office.

List of Subjects in 50 CFR Part 17

    Endangered and threatened species, Exports, Imports, Reporting and 
recordkeeping requirements, Transportation.

Regulation Promulgation

    Accordingly, we amend part 17, subchapter B of chapter I, title 50 
of the Code of Federal Regulations, as set forth below:

PART 17--ENDANGERED AND THREATENED WILDLIFE AND PLANTS

0
1. The authority citation for part 17 continues to read as follows:

    Authority: 16 U.S.C. 1361-1407; 1531-1544; and 4201-4245, unless 
otherwise noted.


0
2. Amend Sec.  17.11 in paragraph (h) by adding an entry for ``Bee, 
bumble, Franklin's'' to the List of Endangered and Threatened Wildlife 
in alphabetical order under INSECTS to read as follows:


Sec.  17.11  Endangered and threatened wildlife.

* * * * *
    (h) * * *

----------------------------------------------------------------------------------------------------------------
                                                                                          Listing citations and
           Common name              Scientific name      Where listed         Status         applicable rules
----------------------------------------------------------------------------------------------------------------
 
                                                  * * * * * * *
             Insects
Bee, bumble, Franklin's.........  Bombus franklini..  Wherever found....  E............  85 FR [Insert Federal
                                                                                          Register page where
                                                                                          the document begins],
                                                                                          8/24/21.
 
                                                  * * * * * * *
----------------------------------------------------------------------------------------------------------------


Martha Williams,
Principal Deputy Director, Exercising the Delegated Authority of the 
Director, U.S. Fish and Wildlife Service.
[FR Doc. 2021-17832 Filed 8-23-21; 8:45 am]
BILLING CODE 4333-15-P