1. Department of Forest Ecology and Management; Swedish University of Agricultural sciences; Umeå 901 83 Sweden
2. Netherlands Institute of Ecology (NIOO-KNAW); Unit for Polar Ecology; PO Box 140 Yerseke AC 4400 The Netherlands
3. Department of Systems Ecology; Institute of Ecological Science; VU University Amsterdam; De Boelelaan 1085 Amsterdam HV NL-1081 The Netherlands
4. British Antarctic Survey; High Crossm Madingley Road Cambridge CB3 0ET UK
5. Department of Arctic and Marine Biology; Faculty of Biosciences; Fisheries and Economics; University of Tromsø; Tromsø N-9037 Norway
6. Division of Biodiversity and Climate Change; Directorate for Nature Management; Trondheim N-7485 Norway
7. Institute of Botany; Alpine Research Centre Obergurgl; University of Innsbruck; Sternwartestr. 15 Innsbruck A-6020 Austria
8. Department of Environmental Science; Agricultural University of Iceland; Keldnaholt Reykjavík IS-112 Iceland
9. Department of Terrestrial Ecology; Norwegian Institute for Nature Research; PO Box 5685 Sluppen Trondheim NO-7485 Norway
10. Biology Department; Grand Valley State University; 1 Campus Drive Allendale MI 49401 USA
11. Department of Biology; University of Saskatchewan; 112 Science Place Saskatoon SK S7N 5E2 Canada
12. Institute of Biology; University of Iceland; Askja, Sturlugata 7 Reykjavik IS-101 Iceland
13. UMR 6553 Ecobio CNRS; Station Biologique; Université de Rennes 1; Paimpont 35380 France
14. Department of Cryptogamy (Bryophyta and Thallophyta); National Botanic Garden of Belgium; Domein van Bouchout Meise 1860 Belgium
15. Research Centre for Applied Alpine Ecology; La Trobe University; Bundoora Victoria 3086 Australia
16. Climate Impacts Research Centre; Ecology and Environmental Sciences; Umeå Universitet; Abisko SE-98107 Sverige