1. Division of Wildlife Conservation, Alaska Department of Fish and Game; 1300 College Road, Fairbanks Alaska 99701 U.S.A.
2. Department of Chemistry; University of Alaska Anchorage 3211 Providence Drive; Anchorage Alaska 99508 U.S.A.
3. Marine Mammal Laboratory, Alaska Fisheries Science Center; National Marine Fisheries Service, NOAA; 7600 Sand Point Way NE, Seattle Washington 98115 U.S.A.
4. University of Alaska Fairbanks; Water and Environmental Research Center, Institute of Northern Engineering; 1764 Tanana Loop, ELIF Suite 240, Fairbanks Alaska 99775-5910 U.S.A.