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Table Tide 1 Summary of study data
MIGRATION AND SPRING ARRIVAL
Spring arrival dates of ducks 19391950
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adult hens apparent April baldpate banded behavior birds blue-winged teal brood bulrush canvasback cattail cent clutch cordgrass courtship crows Delta marsh Delta station destroyed ditch bank diving ducks drakes duck nests ducklings edges eggs eggshell feeding Figure five species flocks flooded Franklin ground squirrel gadwall grain fields grass grazed green-winged teal ground squirrel hatching hens returned Hochbaum home range hunters hunting incubating bird incubation period June known to return large numbers lesser scaup loafing areas mallards and pintails Manitoba migration nest-trapped nesting cover nesting meadows nesting season nests found number of eggs observed occurred pairs Passerine phragmites pintail hens pintail nests pond pothole prairie predators puddle ducks redhead renesting roadside ditch ruddy ducks seen sex ratio shoveller hen shovellers and blue-winged skunks sloughs species of ducks spring stubble study area surface-feeding ducks survival rate Table temperature territory water areas waterfowl weeks whitetop wild Wildl Wildlife yards young