1. Merriam-Powell Center for Environmental Research; Northern Arizona University; P.O. Box 6077 Flagstaff AZ 86011 USA
2. Department of Biology; Northern Arizona University; P.O. Box 5640 Flagstaff AZ 86011 USA
3. Departamento de Botánica; Facultad de Ciencias Naturales y Oceanográficas; Universidad de Concepción; Casilla 160-C Concepción Chile
4. Instituto de Ecología y Biodiversidad; Casilla 653 Santiago Chile
5. Division of Biological Sciences; University of Montana; Missoula MT 59812 USA
6. Department of Biological Sciences; Minnesota State University; Mankato MN 56001 USA
7. Institute of Ecology; Ilia State University; 5 K.Cholokashvili Av Tbilisi 0162 Georgia
8. Department of Biology; York University; 4700 Keele Street Toronto ON M3J 1P3 Canada
9. University Bordeaux 1; CNRS 5805 EPOC; Talence 33405 France
10. Estación Experimental de Zonas Áridas; Consejo Superior de Investigaciones Científicas; Carretera de Sacramento s/n; La Cañada de San Urbano; Almería E-04120 Spain
11. Key Laboratory of Arid and Grassland Agroecology; School of Life Science; Lanzhou University; Lanzhou 730000 China
12. Department of Earth and Planetary Sciences; Johns Hopkins University; Baltimore MD 21218 USA
13. Institut de Recherche pour le Développement (IRD); UMR DIADE/AMAP; CIRAD, TA A51/PS2; Montpellier Cedex 5 34398 France
14. Pontificia Universidad Católica del Ecuador; Av. 12 de Octubre y Roca Quito Ecuador
15. Department of Earth Sciences; University of Gothenburg; P.O. Box 46o Gothenburg SE-405 30 Sweden
16. Department of Botany; University of Otago; P. O. Box 56, 464 Gt. King St Dunedin 9054 New Zealand
17. Departamento de Biología Vegetal II; Facultad de Farmacia; Universidad Complutense; Madrid E-28040 Spain
18. Institute of Landscape Ecology; Slovak Academy of Sciences; Štefánikova 3 Bratislava 814 99 Slovakia
19. Department of Conservation Biology; Vegetation and Landscape Ecology; University of Vienna; Rennweg 14 Vienna 1030 Austria
20. Central Department of Botany; Tribhuvan University; Kathmandu Nepal
21. Department of Animal and Plant Sciences; The University of Sheffield; Western Bank Sheffield S10 2TN UK
22. Biology Department; University of Montana Western; Dillon MT 59725 USA
23. WSL Institute for Snow and Avalanche Research SLF; Fluelastrasse 11 Davos 7260 Switzerland
24. Key Laboratory of Ecohydrology of Inland River Basin; Cold and Arid Regions Environmental and Engineering Research Institute; Chinese Academy of Sciences; 320 Donggang West Road Lanzhou 730000 China
25. The James Hutton Institute; Craigiebuckler Aberdeen AB15 8QH UK