1. Division of Biology Kansas State University Manhattan Kansas 66506 USA
2. Migratory Bird Management U.S. Fish and Wildlife Service Anchorage Alaska 99503 USA
3. Manomet Center for Conservation Sciences Manomet Massachusetts 02345 USA
4. Environment and Climate Change Canada National Wildlife Research Centre Carleton University Ottawa Ontario K1A 0H3 Canada
5. Arctic National Wildlife Refuge U.S. Fish and Wildlife Service Fairbanks Alaska 99701 USA
6. Department of Biological Sciences Simon Fraser University Burnaby British Columbia V3H 3S6 Canada
7. Audubon Society of Portland Portland Oregon 97210 USA
8. Department of Biology Trent University Peterborough Ontario K9J 7B8 Canada
9. Canadian Wildlife Service Yellowknife Northwest Territories X1A 2P7 Canada
10. Alaska Center for Conservation Science and Department of Biological Sciences University of Alaska Anchorage Anchorage Alaska 99508 USA
11. Cornell Lab of Ornithology Cornell University Ithaca New York 14850 USA
12. Environment and Climate Change Canada Wildlife Research Division Ottawa Ontario K1A 0H3 Canada
13. US Geological Survey Anchorage Alaska 99508 USA
14. Aquatic Biology Associates Corvallis Oregon 97330 USA