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For providing logistic support, assistance with data collection, and loan and storage of field equipment, we thank administrators, field personnel, and conservation officers of the Alberta Department of Forestry, Lands, and Wildlife, especially W. W. MacDonald and H. R. Weaver; Manitoba Department of Natural Resources, especially M. M. Gillespie; and Saskatchewan Department of Parks and Renewable Resources.

For administrative services, loan of field equipment, providing aerial photographs, and assistance with data collection we thank the staff of the CWS, especially R. K. Brace, F. D. Caswell, G. S. Hochbaum, D. J. Nieman, S. P. Pryor, J. R. Smith, and B. C. Turner. We thank personnel of the CWS Prairie and Northern Wildlife Centre (formerly Prairie Migratory Bird Research Centre), Saskatoon, Saskatchewan, for their support, in particular G. W. Beyersbergen, J. B. Millar, and L. G. Sugden.

For providing assistance with hiring of field technicians, we thank personnel of USFWS Cooperative Fish and Wildlife Research Units, especially E. E. Klaas, Iowa State University; T. S. Baskett, University of Missouri; I. J. Ball, University of Montana; D. H. Rusch, University of Wisconsin; and S. H. Anderson, University of Wyoming. E. K. Fritzell, University of Missouri, also assisted with hiring.

We thank J. E. Austin, R. J. Blohm, R. K. Brace, A. W. Diamond, D. C. Duncan, G. L. Krapu, K. J. Lungle, W. E. Newton, S. P. Pryor, J. S. Ramsey, M. A. Sovada, B. C. Turner, and J. Y. Takekawa for helpful comments on this manuscript.

We especially thank the numerous dedicated field personnel who assisted with data collection and are recognized individually in Sargeant et. al. (1993). Lastly, we are indebted to the many landowners who allowed us to work on their land and offered hospitality and security of their farmyards for equipment storage.