1. Department of Fisheries, Wildlife, and Conservation Biology; University of Minnesota; 135 Skok Hall 2003 Upper Buford Circle St. Paul MN 55108 USA
2. Minnesota Department of Natural Resources; Fisheries Research; 20596 Hwy 7 Hutchinson MN 55350 USA
3. Nebraska Cooperative Fish and Wildlife Research Unit and School of Natural Resources; University of Nebraska-Lincoln; 405 Hardin Hall 3310 Holdredge Street Lincoln NE 68583 USA
4. Department of Natural Resource Ecology and Management; Iowa State University; 207 Science Hall II Ames IA 50011 USA