1. National Research Council, Robert S. Kerr Environmental Research Center, 919 Kerr Lab Dr., Ada, Oklahoma 74820, United States
2. Department of Biology, East Central University, 1100 E. 14th, Ada, Oklahoma 74820, United States
3. U.S. Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Robert S. Kerr Environmental Research Center, 919 Kerr Lab Dr., Ada, Oklahoma 74820, United States