1. USDA Forest Service, Southern Research Station; Center for Bottomland Hardwoods Research; Box 227 Stoneville MS 38776 U.S.A
2. U.S. Geological Survey Leetown Science Center; Aquatic Ecology Laboratory; 11649 Leetown Road Kearneysville WV 25430 U.S.A
3. U.S. Geological Survey National Wetlands Research Center; 700 Cajundome Boulevard Lafayette, LA 70506 U.S.A
4. Retired