Degree Name

Master of Science (MS)

Semester of Degree Completion

1997

Thesis Director

Thomas A. Nelson

Abstract

I monitored the roosting activity and evaluated roost site selection of red bats (Lasiurus borealis) at study sites in Coles County during the summer of 1996. Red bats were mist-netted and radio transmitters were affixed to 12 individuals. A total of 105 transmitter-days were recorded with 75 roost locations identified. The roost types consisted of eight different species of trees, prairie grass, and residential structures but the vast majority of roosts (92%) were in large, deciduous trees. The height of the roosts ranged from 0.5 to 21.4 m, but 54.7% were between 5-10 m. Movement between consecutive roosts ranged from 0 to 733 m with 80% being less than 200 m. Reduced understory vegetation beneath roosts allowed for a less obstructed flight path. Red bats showed fidelity to their home ranges, but not to individual roost sites. Urban forests in central Illinois provide the essential habitat components for successful colonization by bat species and may constitute important habitat for this species.

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