1. Department of Animal and Plant Sciences University of Sheffield Western Bank Sheffield S10 2TN UK
2. Department of Forest Ecology and Management Swedish University of Agricultural Sciences S901‐83 Umeå Sweden
3. FRAM – High North Research Centre on Climate and the Environment Norwegian Institute for Nature Research (NINA) NO‐9296 Tromsø Norway
4. Royal Swedish Academy of Sciences PO Box 50005 104 05 Stockholm Sweden
5. Department of Ecological Science, section Animal Ecology VU University Amsterdam De Boelelaan 1085 1081 HV Amsterdam The Netherlands