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A COMPARISON OF TWO HANDREARED MALLARD RELEASE METHODS
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5th greater secondary 9th primary adult hens age characters age functions analysis Blohm blue-winged teal bottom vane width breeding season captured Carney correctly aged covert top vane Delta Station differences Direct Method direct release method direct-released hens discriminant functions drakes drought ducklings Ducks Unlimited East Meadows Environment Canada F-test feather measurements flyway sample gadwall Gatti Gentle Method gentle release method gm per day Gollop greater secondary covert hand-reared hens hens returning homing rate immature incubation stage incubation weight loss individual hens initial body weight known-age wild late nesting lost an average Manitoba sample Marshy Point misaged Mississippi Flyway penned flock Population ecology pre-fledging mortality primary covert qualitative method recovery rate regression regression analysis release date release pen sample sources smaller feathers Snow Geese spring SPSS study area T0PW5SC Table TEMP tertial top vane width U.S. Fish variability weight trends wild mallards Wildl wing characters wood ducks WT5P yearling hens