1. Division of Evolution, Ecology and Genetics, Research School of Biology; Australian National University; Canberra ACT 0200 Australia
2. U.S. Geological Survey; Northern Rocky Mountain Science Center; Bozeman MT 59715 U.S.A
3. U.S. Fish and Wildlife Service; Science Applications; Fairbanks AK 99701 U.S.A.
4. Institute of Arctic Biology; University of Alaska Fairbanks; Fairbanks AK 99775 U.S.A
5. Department of Ecology, Evolution and Marine Biology; UC Santa Barbara; Santa Barbara CA 93106 U.S.A
6. Massachusetts Division of Fisheries and Wildlife (MDFW); 100 Hartwell Street West Boylston MA 01583 U.S.A