1. Institute of Life and Environmental Sciences, University of Iceland; Sturlugata 7 IS-101 Reykjavik Iceland
2. Institute of Ecology and Earth Sciences, Department of Botany, University of Tartu; Tartu 51005 Estonia
3. Pyrenean Institute of Ecology (CSIC); Avda Nuestra Señora de la Victoria s/n Jaca 22700 Spain
4. Department of Arctic and Marine Biology; UiT - The Arctic University of Norway; Tromsø NO-9037 Norway
5. Department of Biological Sciences; University of Alberta; Edmonton T6G 2E9 Canada
6. NTNU University Museum, Norwegian University of Science and Technology; Trondheim NO-7491 Norway
7. Fram Centre; Norwegian Polar Institute; Tromsø NO-9296 Norway
8. Arctic Centre; University of Lapland; Rovaniemi FIN-96101 Finland
9. Département de Biologie and Centre d'Études Nordiques; Université Laval; Québec QC G1V 0A6 Canada
10. Section of Ecology, Department of Biology; University of Turku; Turku FI-20014 Finland
11. Aarhus Institute of Advanced Studies, Arctic Research Centre, and Department of Bioscience, Aarhus University; Aarhus Denmark
12. University Centre in Svalbard (UNIS); Longyearbyen NO-9171 Norway
13. Département des Sciences de l'Environnement et Centre d'Études Nordiques; Université du Québec à Trois-Rivières; Trois-Rivières G9A 5H7 Canada
14. Department of Ecology and Environmental Science; Umeå University; Umeå SE-901 87 Sweden
15. Environment Department, School of Life Sciences; Heriot-Watt University; Edinburgh Campus Edinburgh EH14 4AS UK