1. Aquatic Plant Ecology Laboratory; Department of Biological Sciences; Florida Atlantic University; 777 Glades Road Boca Raton FL 33431 USA
2. Department of Biological Sciences; Florida Atlantic University; 777 Glades Road Boca Raton FL 33431 USA
3. Department of Biology; University of Florida; 220 Bartram Hall Gainesville FL 32611 USA
4. Department of Biology; University of North Florida; 1 UNF Drive Jacksonville FL 32224 USA