Date of Award

Summer 8-2016

Document Type


Degree Name

Master of Science (MS)



First Advisor

Joseph Duchamp, Ph.D.

Second Advisor

Jeff Larkin, Ph.D.

Third Advisor

Thomas Simmons, Ph.D.


This study examined bat species activity in two south-central Indiana state forests as part of the Hardwood Ecosystem Experiment. The main objectives were twofold: 1) to compare activity among silvicultural treatments; and 2) to examine the effects of microphone height on species detection. Acoustic surveys were conducted in timber harvests (0.4 to 4 hectares) and in forests that either had undergone the preparatory thinning of a three-stage shelterwood, had received single-tree selection harvests, or had been left untreated.

Recorded activity of Indiana bats (Myotis sodalis) and northern long-eared bats (M. septentrionalis) was higher in first-stage shelterwoods compared to overstory removal harvests, while big brown bat (Eptesicus fuscus) activity was greater in clearcuts than in first-stage shelterwoods. Generally, microphones at 7 meters recorded more activity than microphones at 1 meter. However, microphone height did not influence estimated activity of Indiana bats in harvests or northern long-eared bats in harvests or forest.