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0.1 million abundance Alaska American black duck American wigeon Appendix Arctic Atlantic Flyway biologists Blue-winged teal brant breeding population estimates British Columbia brood Califomia Canada geese canvasback central CM CM confidence intervals counts Ducks Mallards earlier than average Eastem Dakotas eastem survey area Estimated number estimates have increased gadwall green-winged teal habitat conditions higher than last increased an average indices last year's estimate light geese long-term average P<0.001 Manitoba million birds Mississippi Flyway nesting effort nesting phenology North America northcentral U.S. Northem pintail Northem shoveler Northwest Territories Old Crow Flats Ontario Population Canada geese Population of Canada portions Prairie Canada precipitation Queen Maud Gulf redheads regions River Saskatchewan scaup similar to last snow geese southem Alberta southem Saskatchewan species Spring phenology stratum term average total duck estimate traditional survey area tundra swans U.S. Fish waterfowl Waterfowl Population wetland conditions white-fronted geese Wildlife Service winter wood duck