1. Norwegian Institute for Nature Research, FRAM Centre, 9296 Tromsø, Norway
2. Centre for Biodiversity Dynamics, Norwegian University of Science and Technology, 7491 Trondheim, Norway
3. Department of Meteorology, University of Reading, Reading RG6 6ET, UK
4. Norwegian Institute for Nature Research, 7485 Trondheim, Norway
5. Department of Natural Sciences, Tromsø University Museum, 9037 Tromsø, Norway
6. UK Centre for Ecology & Hydrology, Bush Estate, Penicuik EH26 0QB, UK
7. Støyle 19, 6089 Sandshamn, Norway
8. Norwegian Institute for Nature Research, 5006 Bergen, Norway