Affiliation: | 1. Department of Natural Resource Management, South Dakota State University, Brookings, U.S.A;2. Wyoming Cooperative Fish and Wildlife Research Unit, Department of Zoology and Physiology, University of Wyoming, Laramie, U.S.A;3. U.S. Geological Survey, Iowa Cooperative Fish and Wildlife Research Unit, Department of Natural Resource Ecology & Management, Iowa State University, Ames, U.S.A |