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0.1 million Alaska American wigeon Appendix Arctic Atlantic Flyway biologists blue-winged teal brant breeding pairs breeding population estimates British Columbia brood California Canada geese canvasback CD CD CD CM CM drought Eastern Dakotas eastern survey area Estimated number Fish and Wildlife Gadwall goose populations green-winged teal habitat conditions Hudson Bay increased an average indices July ponds last year's estimate late light geese long-term average P<0.001 lower than last mallard numbers Manitoba million birds Mississippi Flyway nesting conditions nesting effort northcentral U.S. Northern pintail Northern shoveler number of ponds Ontario Population of Canada Prairie Canada precipitation production Quebec Queen Maud Gulf redheads region rernained Ross's geese Saskatchewan scaup scoters similar to last snow geese southern Alberta southern Saskatchewan species spring phenology spring surveys survey area strata term average ternperatures traditional survey area trend tundra swans U.S. Fish waterfowl Waterfowl Population wetland conditions Wildlife Service wood ducks Yukon-Kuskokwim Delta