Feeding ecology of canvasbacks staging on Pool 7 of the Upper Mississippi River
By: C. E. Korschgen, L. S. George, and W. L. Green
Edited by: M.W. Weller
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Abstract
Foods consumed by canvasback ducks (Aythya valisineria), food availability, and energetic relationships were studied on Navigation Pool 7 of the upper Mississippi River in 1978, 1979, and 1980. Canvasbacks fed primarily upon winter buds of American wildcelery (Vallisneria americana) and tubers of stiff arrowhead (Sagittaria rigida). In 1980, waterfowl consumed 40% of 380,160 kg of wildcelery winter buds on a portion of Pool 7 referred to as Lake Onalaska. Daily energy expenditure based on estimates from the literature suggests that individual canvasbacks require a minimum of 125 g (dry wt) of wildcelery winter buds each day. Extrapolation of use-days and the daily energy requirement suggests that 3,470 ha of wildcelery are required to support a canvasback population represented by 5 million use-days.
Suggested Citation
Korschgen, C.E., George, L.S., Green, W.L., 1988, Feeding ecology of canvasbacks staging on Pool 7 of the Upper Mississippi River, chap. of Waterfowl in winter, p. 237-249.
| Publication type | Book chapter |
|---|---|
| Publication Subtype | Book Chapter |
| Title | Feeding ecology of canvasbacks staging on Pool 7 of the Upper Mississippi River |
| Year Published | 1988 |
| Language | English |
| Publisher | University of Minnesota Press |
| Publisher location | Minneapolis, MN |
| Contributing office(s) | Northern Prairie Wildlife Research Center |
| Description | 13 p. |
| Larger Work Type | Book |
| Larger Work Subtype | Other Government Series |
| Larger Work Title | Waterfowl in winter |
| First page | 237 |
| Last page | 249 |