1. Program in Ecology, University of Wyoming, 1000 E. University Avenue, Laramie, WY 82071, USA
2. Department of Zoology and Physiology, University of Wyoming, 1000 E. University Avenue, Laramie, WY 82071, USA
3. U.S. Geological Survey, Alaska Science Center, 4210 University Drive, Anchorage, AK 99508, USA
4. Marine Mammals Management, U.S. Fish and Wildlife Service, 1011 East Tudor Road, Anchorage, AK 99503, USA
5. Current: Polar Science Center, Applied Physics Laboratory, University of Washington, 1013 NE 40th Street, Seattle, WA 98105, USA
6. Department of Biological Sciences, California State University, 1250 Bellflower Blvd, Long Beach, CA 90840, USA
7. Polar Bears International, P.O. Box 3008, Bozeman, MT 59772, USA