Title: Changes in Populations and Breeding Success of Boreal Forest Ducks
Abstract: Either (1) agricultural impacts, which reduce breeding success, (2) events during the nonbreeding season, which lower survival, or (3) both might account for declines in populations sizes of some ducks on the North American prairies. We examined changes in population sizes and breeding success of the mallard (Anas platyrhynchos), northern pintail (A. acuta), and lesser scaup (Aythya affinis) in boreal forest, where agriculture has not altered breeding habitats. In 1985-88, we duplicated breeding pair and brood surveys conducted between 1962 and 1965 near Yellowknife, Northwest Territories. Breeding pairs and brood size of lesser scaup were lower (P=0.03) in the 1980's than in the 1960's, but neither population size, nor any index of breeding success of mallards ande pintails, was lower (P>0.05)
Publication Year: 1991
Publication Date: 1991-10-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 13
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