1. US Geological Survey, Upper Midwest Environmental Sciences Center, La Crosse, Wisconsin 54603, USA
2. US Fish and Wildlife Service, Marine Mammals Management, Anchorage, Alaska 99503, USA
3. US Fish and Wildlife Service, Conservation Genetics Laboratory, Anchorage, Alaska 99503, USA
4. US Geological Survey, Alaska Science Center, Anchorage, Alaska 99508, USA
5. US Geological Survey, New York Cooperative Fish and Wildlife Research Unit, Ithaca, New York 14853, USA
6. Alaska Department of Fish and Game, Marine Mammal Program, Fairbanks, Alaska 99701, USA
7. University of Montana, College of Forestry and Conservation, Missoula, Montana 59812, USA
8. Kamchatka Branch of the Pacific Geographical Institute of Far Eastern Branch of Russian Academy of Sciences, 683000 Petropavlovsk-Kamchatsky, Russia