Recent Distribution Records of the Little Brown Bat, &lt;em&gt;Myotis lucifugus&lt;/em&gt;, in Manitoba and Northwestern Ontario

Dubois, John E.; Monson, Kimberly M.

doi:10.22621/cfn.v121i1.393

Cited by 7 publications

(3 citation statements)

References 3 publications

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“…Some species are regional migrants, radiating annually from winter hibernation sites to summer sites, then travelling among swarming sites in the autumn [1] – [4] . Bats engaging in this type of migration have been recorded travelling distances of 500 km or more [2] , [5] and may move in any direction to hibernacula. Other species are latitudinal migrants, travelling south in the autumn and north in the spring [6] – [8] .…”

Section: Introductionmentioning

confidence: 99%

Evidence of Latitudinal Migration in Tri-colored Bats, Perimyotis subflavus

et al. 2012

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BackgroundAnnual movements of tri-colored bats (Perimyotis subflavus) are poorly understood. While this species has been considered a regional migrant, some evidence suggests that it may undertake annual latitudinal migrations, similar to other long distance North American migratory bat species.Methodology/Principal FindingsWe investigated migration in P. subflavus by conducting stable hydrogen isotope analyses of 184 museum specimen fur samples and comparing these results (δDfur) to published interpolated δD values of collection site growing season precipitation (δDprecip). Results suggest that the male molt period occurred between June 23 and October 16 and 33% of males collected during the presumed non-molt period were south of their location of fur growth. For the same time period, 16% of females were south of their location of fur growth and in general, had not travelled as far as migratory males. There were strong correlations between δDfur from the presumed molt period and both growing season δDprecip (males – r 2 = 0.86; p<0.01; females – r 2 = 0.75; p<0.01), and latitude of collection (males – r 2 = 0.85; p<0.01; females – r 2 = 0.73; p<0.01). Most migrants were collected at the northern (>40°N; males and females) and southern (<35°N; males only) extents of the species' range.Conclusions/SignificanceThese results indicate a different pattern of migration for this species than previously documented, suggesting that some P. subflavus engage in annual latitudinal migrations and that migratory tendency varies with latitude and between sexes. We suggest that this species' hibernation ecology makes it particularly susceptible to long winters, making migration from the northern extent of the species' range to more southern hibernacula preferable for some individuals. Fur δD values for some of the northern individuals may indicate an increase in the currently accepted northern range of this species. Sex-biased differences in migration may be the result of differences in reproductive pressures.

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Section: Introductionmentioning

confidence: 99%

Evidence of Latitudinal Migration in Tri-colored Bats, Perimyotis subflavus

et al. 2012

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“…We compiled species occurrence data from multiple sources, including online databases of museum records (VertNet, National Science Foundation (NSF), 2016, Biodiversity Information Serving Our Nation, United States Geological Survey (USGS), 2012), online repositories of vetted public and scientific observations (Global Biodiversity Information Facility, GBIF.org, 2018, Bat Population Database, United States Geological Survey (USGS), 2003), data associated with published literature (Dubois & Monson, 2007; Kuenzi et al, 1999; Ports & Bradley, 1996), data obtained from multiple Natural Heritage Programs (NHP; Montana Natural Heritage Program, 2020; NatureServe, 2019) and data collected in our own field studies (unpublished data). We amassed thousands of occurrence records for each focal species, but the vast majority of records (>85%) were observed during summer or fall swarming, when bats are more readily observed.…”

Section: Methodsmentioning

confidence: 99%

“…We selected five focal species for our analyses: Corynorhinus townsendii 1 , Myotis californicus, Myotis lucifugus, Myotis velifer and Perimyotis subflavus. These species were chosen because occurrence data and field-measured metabolic parameters were available for estimating survivorship and because they were representative of variability in known habitat requirements amongst hibernating bats whose ranges lie in whole or in part in the West, defined here as west of the Mississippi River (Figure 1 (Dubois & Monson, 2007;Kuenzi et al, 1999;Ports & Bradley, 1996), data obtained from multiple Natural Heritage Programs (NHP;Montana Natural Heritage Program, 2020;NatureServe, 2019) and data collected in our own field studies (unpublished data). We amassed thousands of occurrence records for each focal species, but the vast majority of records (>85%) were observed during summer or fall swarming, when bats are more readily observed.…”

Section: Winter Occurrence Datamentioning

confidence: 99%

A hybrid correlative‐mechanistic approach for modeling winter distributions of North American bat species

McClure

Haase

Hranac

et al. 2021

Journal of Biogeography

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Aim The fungal pathogen Pseudogymnoascus destructans and resultant white‐nose syndrome (WNS) continues to advance across North America, infecting new bat hibernacula. Western North America hosts the highest bat diversity in the United States and Canada, yet little is known about hibernacula and hibernation behaviour in this region. An improved understanding of the distribution of suitable hibernacula is critical for land managers to anticipate conservation needs of WNS‐susceptible species in currently uninfected regions. Location United States, Canada. Taxon Bats. Methods We estimated suitability of potential winter hibernaculum sites across five bat species' ranges. We estimated winter survival capacity from a mechanistic survivorship model based on bat bioenergetics and climate conditions. We then used boosted regression trees to relate these estimates, along with key landscape attributes, to bat occurrence data in a hybrid correlative‐mechanistic approach. Results Winter survival capacity, topography, land cover and access to subterranean features were important predictors of winter hibernaculum selection, but the shape and relative importance of these relationships varied amongst species. This suggests that the occurrence of bat hibernacula can, in part, be predicted from readily mapped above‐ground features, not just below‐ground characteristics for which spatial data are lacking. Furthermore, our mechanistic estimate of winter survivorship was, on average, the third strongest predictor of winter occurrence probability across focal species. Main conclusions Winter distributions of North American bat species were driven by their physiological capacity to survive winter conditions and duration in a given location, as well as selection for topographic and other landscape features but in species‐specific ways. The influence of winter survivorship on several species' distributions, the underlying influence of climate conditions on winter survivorship and the anticipated influence of WNS on bats' hibernation physiology and survivorship together suggest that North American bat distributions may undergo future shifts as these species are exposed not only to WNS but also to climate change.

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