1. Rubenstein School of Environment and Natural Resources University of Vermont Burlington Vermont USA
2. Gund Institute for Environment, University of Vermont Burlington Vermont USA
3. USDA Forest Service, Northern Research Station St. Paul Minnesota USA
4. Ecology and Evolutionary Biology Department University of Michigan Ann Arbor Michigan USA
5. University of Michigan Biological Station Pellston Michigan USA
6. USDA Forest Service, Southern Research Station Knoxville Tennessee USA