Segregation in feeding behaviour of four diving ducks in southern Manitoba

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Abstract
The canvasback, Aythya valisinaria; redhead, A. americana; scaup, A. affinis; and ruddy duck, Oxyura jamaicensis, are sympatric on the small wetlands of the Canadian prairie region. The four species did not occur randomly and each species tended to occur by itself more often than with any other species. Each species tended to forage in a particular part of a pond. Selection for different foraging sites appears to be important in segregating those species whose diets overlap most.

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