1. Department of Marine Sciences University of Georgia Athens Georgia USA
2. Present address: Department of Biological Sciences Miami University Middletown Ohio USA
3. Department of Microbiology Southern Illinois University Carbondale Illinois USA
4. Present address: Louisiana Universities Marine Consortium Chauvin Louisiana USA
5. Division of Natural Sciences Indiana Wesleyan University Marion Indiana USA
6. Present address: Department of Environmental Science Rowan University Glassboro New Jersey USA