1. Natural Resource Ecology Laboratory, Colorado State University, Fort Collins, CO
2. US Geological Survey, Fort Collins Science Center, Fort Collins, CO
3. current address: Department of Biological Sciences, Bowling Green State University, Bowling Green, OH
4. Department of Biology, Colorado State University, Fort Collins, CO
5. Chesapeake Biological Laboratory, University of Maryland, Solomons, MD
6. Department of Ecology and Evolutionary Biology, University of Kansas, Lawrence, KS
7. Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, MT