Studies were conducted to assess the reliability of estimates of the local bat population at the University of Michigan Biological Station located in the northern lower peninsula of Michigan. We determined the consistency of three censusing methods: roost counts, fecal analysis and acoustical surveys. We also focused on the effects of abiotic factors on bat activity. Entrance and exits at two roosts located on the UMBS campus (Houghton North and Houghton South), light intensity, temperature, weather conditions were recorded. Bat activity at the roosts and guano output were also recorded.
photometer (Li-Cor model 182)
Anabat echolocation device