1. Norwegian Institute for Nature Research; P.O. Box 8685 Sluppen NO-7485 Trondheim Norway
2. Alaska Department of Fish and Game; Division of Wildlife Conservation; 1300 College Road Fairbanks AK 99701 USA
3. Department of Ecology and Natural Resource Management; Norwegian University of Life Sciences; P.O. Box 5003, NO-1432 Ås Norway
4. Department of Forestry and Wildlife Management; Hedmark University of Applied Sciences Campus Evenstad, NO-2480 Koppang Norway
5. Department of Wildlife, Fish, and Environmental Studies; Swedish University of Agricultural Sciences; SE-90183 Umeå Sweden