Changes in Population Size and Clustering Behavior of Hibernating Bats in the Upper Peninsula of Michigan after Arrival of White-nose Syndrome

Allen Kurta^1,* and Steven M. Smith²

¹Department of Biology, Eastern Michigan University, Ypsilanti, MI 48197. ²S.M. Smith Company, 1105 Westwood Avenue, Iron Mountain, MI 49801. *Corresponding author.

Northeastern Naturalist, Volume 27, Issue 4 (2020): 763–772

Abstract
We examined populations of bats hibernating in 50 abandoned mines in Michigan during the 3 years before and 4–6 years after arrival of the fungal disease white-nose syndrome. Overall size of the regional population fell by 89.9%. Myotis lucifugus (Little Brown Bat), which represented 90% of the pre-epidemic population, declined by 89.9%. Myotis septentrionalis (Northern Long-eared Bat) and Perimyotis subflavus (Tricolored Bat) decreased by 98.5% and 93.9%, respectively, and both species appear threatened with regional extinction. Eptesicus fuscus (Big Brown Bat), in contrast, increased by 11.7%. The disease also impacted social patterns, with the proportion of Little Brown Bats that were solitary during hibernation in 10 of the mines increasing from 23% to 46% after onset of the disease.

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