1. US Army Engineer Research and Development Center, Vicksburg, MS 39180, USA
2. Department of Biology, Indiana University of Pennsylvania, Indiana, PA 15705, USA
3. Department of Biology, University of Miami, Coral Gables, FL 33124, USA
4. Department of Forestry and Natural Resources, Purdue University, Lafayette, IN 47907, USA
5. Department of Biology, Missouri State University, Springfield, MO 65804, USA