| 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). |
| Genre: | Article |
| ProdID: | 1001380 |
| Citation Author: | Austin, J. E.; Serie, J. R.; Noyes, J. H. |
| Citation Contributing Office: | |
| Citation Datum: | |
| Citation Day: | |
| Citation Edition: | |
| Citation Editor: | |
| Citation End Page: | 176 |
| Citation Issue: | 3 |
| Citation Keywords: | |
| Citation Language: | English |
| Citation Larger Work Title: | Prairie Naturalist |
| Citation LatN: | |
| Citation LatS: | |
| Citation LonE: | |
| Citation LonW: | |
| Citation Month: | |
| Citation No Pagination: | |
| Citation Number Of Pages: | 5 |
| Citation Online Only Flag: | |
| Citation Phsyical Description: | p. 171-176 |
| Citation Projection: | |
| Citation Public Comments: | |
| Citation Publisher: | |
| Citation Series: | |
| Citation Series Code: | |
| Citation Series Number: | |
| Citation Search Results Text: | Diet of canvasbacks during breeding; 1990; Article; Journal; Prairie Naturalist; Austin, J. E.; Serie, J. R.; Noyes, J. H. |
| Citation Start Page: | 171 |
| Citation Volume: | 22 |
| Citation Year: | 1990 |
| Type: | citation/reference |
| Text: | Diet of canvasbacks during breeding; 1990; Article; Journal; Prairie Naturalist; Austin, J. E.; Serie, J. R.; Noyes, J. H. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DOCUMENT): | http://www.npwrc.usgs.gov/resource/birds/canvdiet/index.htm |
| Date Other: | Mon, 1 Jan 1990 00:00 -0600 |
| Publisher: | |
