1. Division of Plant Sciences, Institute for Biology University of Graz Holteigasse 6 8010 Graz Austria
2. Multiphase Chemistry Department Max Planck Institute for Chemistry Hahn‐Meitner‐Weg 1 55128 Mainz Germany
3. Southwest Biological Science Center U.S. Geological Survey 2290 S. Resource Blvd Moab UT 84532 USA
4. Biology Institute University of Kaiserslautern PO Box 3049 67653 Kaiserslautern Germany
5. School of Forestry Northern Arizona University 200 E. Pine Knoll Drive, Box 15018 Flagstaff AZ 86011 USA
6. Department of Ecology and Evolutionary Biology University of Colorado Boulder Campus Box 334 Boulder CO 80309 USA
7. Department of Environmental Studies Dartmouth College 6182 Steele Hall, 39 College Street Hanover NH 03755 USA
8. Department of Biological Sciences University of Texas at El Paso 500 W. University Ave El Paso TX 79968 USA
9. Centre for Ecosystem Science, School of Biological, Earth and Environmental Sciences University of New South Wales Sydney NSW 2052 Australia
10. Department of Animal and Range Sciences New Mexico State University PO Box 30003, MSC 3‐I Las Cruces NM 88003 USA
11. Department of Biology New Mexico State University PO Box 30001, MSC 3AF Las Cruces NM 88003 USA
12. Department of Forest and Rangeland Stewardship Colorado State University 1472 Campus Delivery, Colorado State University Fort Collins CO 80521 USA
13. Division of Environmental Sciences Instituto Potosino de Investigación Científica y Tecnológica Camino a la Presa San José 2055, Col. 4ta Sección CP 78216 San Luis Potosi SLP Mexico
14. Institute of Ecology and Environmental Sciences of Paris (IEES‐Paris), SU/IRD/CNRS/INRAE/UPEC 32, Avenue Henry Varagnat F‐93143 Bondy Cedex France
15. Instituto Multidisciplinar para el Estudio del Medio “Ramón Margalef” Universidad de Alicante Carretera de San Vicente del Raspeig s/n 03690 San Vicente del Raspeig Spain
16. Departamento de Ecología Universidad de Alicante Carretera de San Vicente del Raspeig s/n 03690 San Vicente del Raspeig Spain
17. Department of Agronomy and Centro de Investigación de Colecciones Científicas (CECOUAL) Universidad de Almería carretera Sacramento s/n 04120 La cañada de San Urbano, Almeria Spain
18. USDA Forest Service, Northern Research Station 410 MacInnes Drive Houghton MI 49931‐1134 USA
19. Extension Agriculture and Natural Resources Utah State University 1850 S. Aggie Blvd Moab UT 84532 USA
20. State Key Laboratory of Desert and Oasis Ecology Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences 818 South Bejing Road Urumqi City 830011 Xinjiang China
21. Institute of Soil and Water Conservation Northwest A & F University 26 Xinong Road Yangling Shaanxi 712100 China