1. Forest Ecosystems and Society, College of Forestry, Oregon State University, 321 Richardson Hall, Corvallis, OR 97331, USA
2. Rocky Mountain Biological Laboratory, PO Box 519, Crested Butte, CO 81224, USA
3. Rice University, Biosciences at Rice, Ecology and Evolutionary Biology Department, 6100 Main St. Houston, TX 77005, USA
4. US Environmental Protection Agency, National Health and Environmental Effects Research Laboratory, Western Ecology Division, 200 SW 35th St., Corvallis, OR 97333, USA
5. USDA Forest Service Pacific Northwest Research Station, 3200 SW Jefferson Way, Corvallis, OR 97331, USA