1. Minnesota Cooperative Fish and Wildlife Research Unit, University of Minnesota, Saint Paul, MN, USA
2. Department of Fisheries, Wildlife and Conservation Biology, University of Minnesota, Saint Paul, MN, USA
3. U.S. Geological Survey, Minnesota Cooperative Fish and Wildlife Research Unit, University of Minnesota, Saint Paul, MN, USA
4. Division of Fish and Wildlife, Minnesota Department of Natural Resources, St. Paul, MN, USA
5. Minnesota Department of Natural Resources, Wetland Wildlife Populations and Research Group, Bemidji, MN, USA