1. USDA Forest Service, Northern Research Station, 1831 Hwy 169 E, Grand Rapids, MN 55744, USA.
2. University of Minnesota, Department of Soil, Water, and Climate, 1991 Upper Buford Circle, St. Paul, MN 55108, USA.
3. USDA Forest Service, Legislative Affairs, 201 14th Street, SW, Washington, DC 20250-1130, USA.
4. USDA Forest Service, Northern Research Station, 11 Campus Boulevard, Suite 200, Newtown Square, PA 19073, USA.
5. Complex Systems Research Center, Institute for the Study of Earth, Oceans and Space, University of New Hampshire, Durham, NH 03820, USA.