Northern Prairie Wildlife Research Center
Waterfowl Communities in the Northern Plains
Canvasback. -- The highest density strata for canvasbacks are in the
parkland region of Canada and in the far north; the Woodworth Study Area is
included in the second highest quartile. Although continental numbers of canvasbacks
tended to decline during the study period, the Woodworth population increased
beginning in the late 1970s (Fig. 12).
Canvasback counts were not correlated to wetland counts in the Woodworth
Study Area. lohnson and Grier (1988) reported r values in the range 0.20 to
0.40 for the Prairie Pothole Region of North Dakota. No weather variables
were significantly related with counts of this species or were included in
the best model.
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