1. Department of Natural Resources and the Environment, University of Connecticut, Storrs, CT 06269-4087, USA.
2. Center for Environmental Science and Engineering, University of Connecticut, Storrs, CT 06269-4210, USA.
3. Department of Biology, Virginia Commonwealth University, Richmond, VA 23284-2012, USA.
4. USDA Forest Service, Northern Research Station, Durham, NH 03824, USA.
5. Colgate University, Hamilton, NY 13346, USA.
6. Department of Civil and Environmental Engineering, Syracuse University, Syracuse, NY 13244, USA.
7. Department of Natural Resources, Cornell University, Ithaca, NY 14853, USA.
8. USDA Forest Service, Northern Research Station, Burlington, VT 05403, USA.