1. Centre for Ecological and Evolutionary Synthesis (CEES), Department of BiosciencesUniversity of Oslo P.O. Box 1066 Blindern, NO‐0316 Oslo Norway
2. Norwegian Veterinary Institute P.O. Box 750 Sentrum, NO‐0106 Oslo Norway
3. Norwegian Institute for Nature Research (NINA) P.O. Box 5685 Torgarden, NO‐7485 Trondheim Norway