1. CREAF Cerdanyola del Vallès; Barcelona Spain
2. CTFC; Solsona Spain
3. Northern Forestry Centre; Canadian Forest Service; Natural Resources Canada; Edmonton AB Canada
4. Aldo Leopold Wilderness Research Institute; Rocky Mountain Research Station; USDA Forest Service; Missoula MT USA
5. Division of Ecosystem Sciences; Department of Environmental Science, Policy, and Management; University of California, Berkeley; Berkeley CA USA