1. U.S. Geological Survey Oklahoma Cooperative Fish and Wildlife Research Unit 007 Agricultural Hall Stillwater OK 74078 USA
2. Oklahoma Cooperative Fish and Wildlife Research Unit Oklahoma State University Stillwater OK USA
3. Division of Biological Sciences U.S. Fish and Wildlife Service Albuquerque NM USA
4. Environmental Sciences Division Oak Ridge National Laboratory Oak Ridge TN USA
5. Department of Biological and Agricultural Engineering North Carolina State University Raleigh NC USA