Species Assessment for Western Long-Eared Myotis (Myotis Evotis) in Wyoming

Publication Information

Rebecca Buseck
Douglas A Keinath
Publication Date: 2004-08
Tags: BLM, WLCI Agency Report, WLCI


Myotis evotis (long-eared myotis), a former Category 2 Candidate, is currently recognized by 
several federal and state agencies as a sensitive species, in part because very little information 
exists to provide evaluations on population status and viability locally or rangewide. 
Primary threats to M. evotis are roost disturbance (especially that leading to loss or destruction 
of roosting structures), habitat alteration, and toxic chemicals.  Roost disturbance (especially of 
maternity roosts and hibernacula) can take the form of direct human contact or alternation of the 
roost environment.  Habitat alteration refers to modification of any component of the required 
habitat mosaic, (e.g., presence and quality of open water, roost structures, and coniferous forest 
stands) that might directly decrease suitability for bats or indirectly affect bats by altering prey 
availability or modifying how those components relate to each other spatially.  Chemicals refer 
primarily to pesticides and toxic impoundments from resource extraction, which can cause direct 
bat mortality and reduce populations of insect prey.  
It is important to determine presence and abundance of M. evotis within Wyoming, and then 
determine habitat associations in order to apply proper conservation management for this species.  
Continual and consistent monitoring of known populations will help define local populations and 
establish habitat-use.  Once these specific habitat features are determined, management directions 
should insure that key life history stages are not disturbed, the habitat mosaic is preserved for 
persistence of these populations, and exposure to potentially detrimental chemicals is eliminated.  
More specific issues of conservation concern are discussed in greater detail later in this 
assessment.  Fulfilling the information needs listed at the end of this document will clarify 
population status and contribute to refining these conservation goals.


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