1. Graduate Assistant, Dept. of Fisheries and Wildlife Sciences, 302 Anheuser-Busch Natural Resources Building, Univ. of Missouri, Columbia, MO 65203 (corresponding author).
2. Professor, Dept. of Fisheries and Wildlife Sciences, 302 Anheuser-Busch Natural Resources Building, Univ. of Missouri, Columbia, MO 65203.
3. Associate Professor, Dept. of Environmental Conservation, Univ. of Massachusetts, 160 Holdsworth Way, Amherst, MA 01003.