1. Work done under contract to U.S. Geological Survey, Fort Collins, CO, USA
2. U.S. Geological Survey, Fort Collins Science Center, Fort Collins, CO, USA
3. Virginia Tech, Department of Fish & Wildlife Conservation, Blacksburg, VA, USA
4. Sonoran Joint Venture, U.S. Fish and Wildlife Service, Tucson, AZ, USA
5. U.S. Geological Survey, Minnesota Cooperative Fish and Wildlife Research Unit, University of Minnesota, Saint Paul, MN, USA
6. Faculty of Kinesiology, Sport, and Recreation, University of Alberta, Edmonton, AB, Canada
7. Missouri Department of Conservation, Columbia, MO, USA