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Montana Animal Field Guide

Montana Field Guides

Yuma Myotis - Myotis yumanensis

Potential Species of Concern

Global Rank: G5
State Rank: S3S4

Agency Status
USFWS:
USFS:
BLM:
FWP SWAP: SGIN


 

External Links





 
General Description
Similar in appearance to the little brown myotis (Myotis lucifugus), and can be difficult to distinguish.

Diagnostic Characteristics
Easily confused with little brown myotis.

Species Range
Montana Range

Click the legend blocks above to view individual ranges.

Western Hemisphere Range

 


Range Comments
The species' distribution in the state is uncertain due to the difficulties in differentiating it from the Little Brown Myotis (Myotis lucifugus). Acoustic surveys in northwestern Montana and museum vouchers identified with skull measurements indicate the species is present west of the Continental Divide, but genetic confirmation is needed.

Summary of Observations Submitted for Montana
Number of Observations: 50

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density

Recency

 

(Observations spanning multiple months or years are excluded from time charts)



Habitat
Found near water in dry coniferous forests and arid shrublands. Summer day roosts include buildings, bridges, mines, and bat houses, sometimes caves and trees. Hibernacula not described.

Food Habits
Often prey on beetles as well as a variety of soft-bodied insects including flies, mosquitoes, mayflies, moths, and termites.

Ecology
Emerge when it is nearly dark, often foraging low over water. Sexes segregated; males roost singly or in small groups. Maternity colonies can include several hundred individuals. Females have one young, usually born in late June or July. April records in Montana could be spring migrants.

Reproductive Characteristics
This bat has only one young per year, and nothing is known about the mating and social system or natal sex ratio of this species. Mating is expected to be non-selective as in the Little Brown Myotis (Milligan 1993).

References
  • Literature Cited AboveLegend:   View Online Publication
    • Milligan, B.N., and R.M. Brigham, 1993. Sex ratio variation in the yuma bat (Myotis yumanensis). Canadian Journal of Zoology 71:937-940.
  • Additional ReferencesLegend:   View Online Publication
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    • Abernethy, I.M., M.D. Andersen, and D.A. Keinath. 2012. Bats of southern Wyoming: distribution and migration year 2 report. Prepared for the USDI Bureau of Land Management by the Wyoming Natural Diversity Database, University of Wyoming, Laramie, Wyoming.
    • Adams, R.A. 2003. Bats of the Rocky Mountain West: natural history, ecology and conservation. University Press of Colorado: Boulder, CO. 289 pp.
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    • Aldrich, H. 1986. Manoeuverability and ecological segregation in little brown (Myotis lucifugus) and Yuma (M. yumanensis) bats (Chiroptera: Vespertilionidae). Canadian Journal of Zoology 64:1878-1882.
    • Aldridge, H. 1986. Manoeuvrability and Ecological Segregation in the Little Brown (Myotis lucifugus) and Yuma (M. yumanensis) Bats (Chiroptera: Vespertilionidae) (English). Canadian Journal of Zoology 64(9): 1878-1882.
    • Amichai, E., G. Blumrosen, and Y. Yovel. 2015. Calling louder and longer: how bats use biosonar under severe acoustic interference from other bats. Proceedings of the Royal Society B: Biological Sciences, The Royal Society 282(1821): 20152064.
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    • Roemer, D.M. 1994. Results of field surveys for bats on the Kootenai National Forest and the Lolo National Forest of western Montana, 1993. Unpublished report for the Kootenai National Forest. Montana Natural Heritage Program, Helena. 19 pp.
    • Rossillon, M. 1995. The McDonald Mine, west of Ravalli: a cultural resource inventory and evaluation. Renewable Technologies, Inc.. Butte. MT. Unpublished report. 24 pp.
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    • Scheeter, Jessica and David Zell. 1996. Bat survey of Lower Birch Creek Drainage, Beaverhead National Forest.
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    • Schwab, N.A. 2004. Bat Conservation Strategy and plan for the State of Montana. Intermountain Journal of Sciences 10(1-4): 80.
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    • Van Zyll de Jong, C.G. 1985. Handbook of Canadian mammals. Volume 2. Bats. National Museums of Canada, Ottawa. 212 pp.
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    • Vonhof, M. J., and R.M.R. Barclay. 1996. Roost-site selection and roosting ecology of forest-dwelling bats in southern British Columbia. Canadian Journal of Zoology 74:1797-1805.
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    • Weller, T.J. and D.C. Lee. 2007. Mist Net Effort Required to Inventory a Forest Bat Species Assemblage. Journal of Wildlife Management 71(1): 251-257.
    • Willis, C.K. 2015. Conservation Physiology and Conservation Pathogens: White-Nose Syndrome and Integrative Biology for Host–Pathogen Systems. Integrative Comparative Biology 55(4): 631-641 
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    • Wolfe, M.L. and A. Kozlowski. 2006. Bat inventories at Grant-Kohrs Ranch National Historic Site and Little Bighorn Battlefield National Monument, FInal Report. Rocky Mountains Cooperative Ecosystems Studies Unit. Utah State University. Logan, UT. 26 pp.
    • Worthington, D.J. 1991. Abundance and distribution of bats in the Pryor Mountains of south central Montana and north eastern Wyoming. Montana Natural Heritage Program, Helena, MT.
    • Worthington, D.J. and H.N. Ross. 1990. Abundance and distribution of bats in the Pryor Mountains of south central Montana. Unpublished report for the Montana Natural Heritage Program. 20 pp.
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Citation for data on this website:
Yuma Myotis — Myotis yumanensis.  Montana Field Guide.  Montana Natural Heritage Program and Montana Fish, Wildlife and Parks.  Retrieved on July 26, 2016, from http://FieldGuide.mt.gov/speciesDetail.aspx?elcode=AMACC01020