1. USDA-ARS Jornada Experimental Range; New Mexico State University; Las Cruces New Mexico USA
2. Department of Geography; University of California, Los Angeles; California USA
3. U.S. Geological Survey; Southwest Biological Science Center; Moab Utah USA
4. National Park Service; Canyonlands National Park; Moab Utah USA
5. University of Maryland Center for Environmental Sciences; Appalachian Lab; Frostburg Maryland USA
6. U.S. Geological Survey; Pacific Science Center; Santa Cruz California USA