1. Department of Biology; University of Miami; Coral Gables FL 33146 USA
2. Faculty of Science; University of South Bohemia & Institute of Parasitology; Czech Academy of Sciences; Ceske Budejovice 37005 Czech Republic
3. Division of Biological Sciences; University of Montana; Missoula MT 59812 USA
4. Department of Biology; Indiana University; Bloomington IN 47405 USA
5. Department of Ecology and Evolution, and Consortium for Inter-Disciplinary Environmental Research; State University of New York at Stony Brook; Stony Brook NY 11794 USA