1. US Geological Survey; Fort Collins Science Center; Fort Collins Colorado USA
2. Cary Institute of Ecosystem Studies; Millbrook New York USA
3. US Geological Survey; Southwest Biological Science Center, Grand Canyon Monitoring and Research Center; Flagstaff Arizona USA
4. Department of Ecology; Montana State University; Bozeman Montana USA
5. Department of Biological Sciences; Idaho State University; Pocatello Idaho USA