1. Pennsylvania Cooperative Fish and Wildlife Research Unit, Pennsylvania State University, 413 Forest Resources Building, University Park, PA 16802, USA.
2. Department of Fisheries, Wildlife, and Conservation Biology, University of Minnesota, 135 Skok Hall, 2003 Upper Buford Cr., St. Paul, MN 55108, USA.
3. North Carolina Division of Marine Fisheries, North Carolina Department of Environment Quality, Morehead City, NC 28557, USA.
4. Escanaba Lake Research Station, Office of Applied Science, Wisconsin Department of Natural Resources, 3110 Trout Lake Station Drive, Boulder Junction, WI 54512, USA.
5. US Geological Survey, Pennsylvania Cooperative Fish and Wildlife Research Unit, Pennsylvania State University, 402 Forest Resources Building, University Park, PA 16802, USA.