Abstract
Nudds and Cole (1991) compared densities of mallards (Anas platyrhynchos), northern pintails (Anas acuta), and lesser scaup (Aythya affinis) breeding in boreal forest near Yellowknife, Northwest Territories, in the 1960s and 1980s. Densities of lesser scaup declined, but those of the other species did not differ (P > 0.5), leading them to conclude that loss of prairie habitat may be a sufficient explanation to account for widespread population declines, at least for mallards and northern pintails. However, their tests lacked power, and they did not consider the magnitude of population changes during the same period on the prairies
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