1. Southwest Biological Science Center; US Geological Survey; Moab Utah 84532 USA
2. Department of Plant and Environmental Sciences; New Mexico State University; Las Cruces New Mexico 88003 USA
3. Jornada Basin LTER Program; New Mexico State University; Las Cruces New Mexico 88003 USA
4. USDA-ARS Jornada Experimental Range; New Mexico State University; Las Cruces New Mexico 88003 USA
5. Jornada Experimental Range Department; New Mexico State University; Las Cruces New Mexico 88003 USA
6. Natural Resources Conservation Service; Richfield Utah 84701 USA