1. Odum School of Ecology; University of Georgia; 140 E. Green Street Athens GA 30602 USA
2. Agricultural Research Service; United States Department of Agriculture; 10300 Baltimore Avenue Bldg. 1180 BARC-East Beltsville MD 20705 USA
3. Department of Biomedical Sciences and Department of Integrative Biology; Oregon State University; 105 Magruder Hall Corvallis OR 97331 USA
4. Department of Infectious Diseases; University of Georgia; 510 D.W. Brooks Drive Athens GA 30602 USA