1. Department of Environmental and Molecular Toxicology, North Carolina State University, Box 7633, Raleigh, North Carolina 27695 USA
2. Upper Midwest Environmental Sciences Center, US Geological Survey, 2630 Fanta Reed Road, La Crosse, Wisconsin 54603 USA
3. Columbia Environmental Research Center, US Geological Survey, 4200 New Haven Road, Columbia, Missouri 65201 USA
4. Ecological Services Field Office, US Fish and Wildlife Service, P.O. Box 33726, Raleigh, North Carolina 27636 USA
5. Ecological Services Field Office, US Fish and Wildlife Service, 101 Park DeVille Drive, Columbia, Missouri 65203 USA
6. Department of Biology, Missouri State University, 901 South National Avenue, Springfield, Missouri 65897 USA
7. Department of Fisheries and Wildlife Sciences, Virginia Polytechnic Institute and State University, 100 Cheatham Hall, Blacksburg, Virginia 24061 USA
8. US Environmental Protection Agency, 77 West Jackson Boulevard, Chicago, Illinois 60604 USA