1. U.S. Fish and Wildlife Service, Migratory Bird Management; 1011 East Tudor Rd. Mail Stop 201 Anchorage Alaska 99503 USA
2. Department of Biology and Wildlife; University of Alaska Fairbanks; Fairbanks Alaska 99775 USA
3. ABR Inc.-Environmental Research & Services; P.O. Box 240268 Anchorage Alaska 99524 USA
4. Biology Department; Mount Allison University; 63B York Street Sackville, New Brunswick E4L 1G7 Canada
5. U.S. Geological Survey, Alaska Cooperative Fish and Wildlife Research Unit; University of Alaska Fairbanks; Fairbanks Alaska 99775-7020 USA
6. Zoological Museum; Moscow State University; Moscow 125009 Russia
7. Institute of Biology and Soil Science; Russian Academy of Sciences; Vladivostok Russia