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Alaska American wigeon Appendix Atlantic Flyway Banks Island birds blue-winged teal brant breeding pairs breeding population estimates British Columbia broods California Canada geese canvasbacks central confidence intervals decreased early June Eastern Dakotas eastern survey area Estimated number estimates and 95 fall flight Field biologists flooding gadwall geese nest geese were counted goose populations green-winged teal habitat conditions Hudson Bay increased indices January surveys last year's Lesser Snow Geese Manitoba Mexico Mississippi Flyway Montana North America northcentral U.S. northern pintails northern shovelers number of breeding number of ponds Ontario Pacific ponds in July population nests Population of Canada portions Prairie Canada precipitation predicted Queen Maud Gulf rates record-high level recruitment redheads region result River Saskatchewan satellite imagery scaup species Spring surveys status strata surveys conducted temperatures total ducks traditional survey area trend tundra swans U.S. Fish Ungava Peninsula water levels weather wetland conditions Wildlife Service Yukon-Kuskokwim Delta