Monitoring the status of Gray Bats (Myotis grisescens) in Virginia, 2009-2014, and potential impacts of White-nose Syndrome

Southeastern Naturalist
By: , and 



Myotis grisescens (Gray Bat) is a federally endangered species distributed over the mid-South with a summer range that extends across the upper Tennessee River Basin, including southwest Virginia. Given the onset of White-nose Syndrome (WNS) in the Commonwealth in the winter of 2009, we initiated yearly surveys in late summer 2009 to monitor the status of known summer populations. Our objectives were to examine the relative health of these bats using body mass index (BMI), and determine any changes in juvenile recruitment across sites and years. We did not find any marked changes in BMI across years after WNS for Gray Bats. This finding suggests that surviving bats are either not negatively impacted by WNS or have recovered sufficiently by late summer as to not document obvious differences across years. After limiting our analyses of juvenile recruitment to only the individuals that we had definitively aged via backlit photos (2010–2014), we found a non-significant declining trend in juvenile recruitment; a trend that merits continued monitoring in the years to come. As Gray Bats have only recently shown to be susceptible to WNS infection, it is possible that observable population declines are forthcoming.

Study Area

Publication type Article
Publication Subtype Journal Article
Title Monitoring the status of Gray Bats (Myotis grisescens in Virginia, 2009-2014, and potential impacts of White-nose Syndrome
Series title Southeastern Naturalist
DOI 10.1656/058.015.0114
Volume 15
Issue 1
Year Published 2016
Language English
Publisher Eagle Hill Institute
Contributing office(s) Coop Res Unit Leetown, New York Water Science Center
Description 11 p.
First page 127
Last page 137
Country United States
State Virginia
Online Only (Y/N) N
Additional Online Files (Y/N) N
Google Analytic Metrics Metrics page
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