The study was funded by the U.S. Fish and Wildlife Service through Northern
Prairie Wildlife Research Center. We are grateful for the administrative support
of W. R. Goforth and D. L. Trauger. D. W. Sparling and D. H. Johnson assisted
with statistical analyses. We thank T. Fondell and L. Vanderholf for field assistance
and M. G. Anderson, C. E. Korschgen, K. P. Kenow, G. A. Swanson, and W. H. Hohman
for comments on the manuscript.
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