Northern Prairie Wildlife Research Center
Waterfowl Communities in the Northern Plains
American Wigeon. -- The distribution of this species is centered farther
north than most of the other dabbling ducks, with the area containing the Woodworth
Study Area being in the second lowest quartile of densities. Continental populations
declined after 1970, while populations at Woodworth fell erratically during
the entire study period (Fig. 6).
There was no correlation between counts of American wigeon and wetland densities
at Woodworth. This result was similar to that of Johnson and Grier (1988).
The only weather variable that seemed to correspond to wigeon numbers was
May precipitation, and only this factor was included in the best regression
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