S N DeWitte1, M H Kurth2, C R Allen3, I Linkov2. 1. Departments of Anthropology and Biological Science, University of South Carolina, Columbia, SC 29208, USA. 2. United States Army Corps of Engineer, Engineer Research and Development Center, Concord, MA 01742, USA. 3. US Geological Survey, Nebraska Cooperative Fish and Wildlife Research Unit, School of Natural Resources, University of Nebraska, Lincoln, NE 68583, USA.