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Diet of canvasbacks during breeding

Prairie Naturalist

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Abstract

We examined diets of canvasbacks (Aythya valisineria) breeding in southwestern Manitoba during 1977-81. Percent volume of animal foods consumed did not differ between males and females nor among prenesting, rapid follicle growth, laying, incubation, and renesting periods in females (mean = 50.1%). Tubers and shoots of fennelleaf pondweed (Potamogeton pectinatus) and midge larvae (Chironomidae) were the predominant foods, comprising on average 45% and 23% of the diet volume, respectively. Continued importance of plant foods to canvasbacks throughout reproduction contrasts with the mostly invertebrate diets of other prairie-breeding ducks, and does not fit current theories of nutritional ecology of breeding anatids (i.e., females meet the protein requirements of reproduction by consuming a high proportion of animal foods).

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Diet of canvasbacks during breeding
Series title:
Prairie Naturalist
Volume
22
Issue:
3
Year Published:
1990
Language:
English
Description:
p. 171-176
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
171
Last page:
176
Number of Pages:
5