1. U.S. Geological Survey, Wetland and Aquatic Research Center Baton Rouge Louisiana USA
2. USDA Forest Service, Center for Forested Wetlands Research Cordesville South Carolina USA
3. Michigan Technological University, College of Forest Resources and Environmental Science Houghton Michigan USA
4. U.S. Geological Survey, Wetland and Aquatic Research Center, Lafayette Lafayette Louisiana USA
5. U.S. Geological Survey, Florence Bascom Geoscience Center Reston Virginia USA