[1] Univ Wyoming, Program Ecol, Laramie, WY 82071 USA
[2] Univ Wyoming, Dept Zool & Physiol, Laramie, WY 82071 USA
[3] US Geol Survey, Alaska Sci Ctr, Anchorage, AK 99508 USA
[4] US Fish & Wildlife Serv, Marine Mammals Management, Anchorage, AK 99503 USA
[5] Univ Washington, Polar Sci Ctr, Seattle, WA 98105 USA
[6] Polar Bears Int, Bozeman, MT 59772 USA