1. Department of Geography and Intercollege Graduate Degree Program in Ecology The Pennsylvania State University University Park PA 16802 USA
2. Department of Ecosystem Science and Management and Intercollege Graduate Degree Program in Ecology The Pennsylvania State University University Park PA 16802 USA
3. Cary Institute of Ecosystem Studies Millbrook NY 12545 USA
4. Department of Environmental Science Allegheny College Meadville PA 16335 USA
5. USDA Forest Service Northern Research Station Durham NH 03824 USA
6. Department of Civil and Environmental Engineering Syracuse University Syracuse NY 13244 USA