1. U.S. Geological Survey, Eastern Ecological Science Center, Leetown Research Laboratory Kearneysville West Virginia USA
2. U.S. Geological Survey, Wetland and Aquatic Research Center Gainesville Florida USA
3. U.S. Fish and Wildlife Service, Department of Fish and Wildlife Conservation, Virginia Polytechnic Institute and State University Blacksburg Virginia USA
4. Department of Fish and Wildlife Conservation Virginia Polytechnic Institute and State University Blacksburg Virginia USA