1. D.L. Zentner Oklahoma Cooperative Fish and Wildlife Research Unit, Oklahoma State University, 007 Agricultural Hall, Stillwater, Oklahoma 74078Present address: Oklahoma Department of Wildlife Conservation, Oklahoma Fishery Research Laboratory, 500 Constellation Street, Norman, Oklahoma 73072
2. S.K. Brewer U.S. Geological Survey, Alabama Cooperative Fish and Wildlife Research Unit, Auburn, Alabama 36832
3. D.E. Shoup Department of Natural Resource Ecology and Management, Oklahoma State University, 008C Agricultural Hall, Stillwater, Oklahoma 74078