1. Norwegian Univ. of Life Sciences, Faculty of Environmental Sciences and Natural Resource Management; NO-1430 Ås Norway
2. Swedish Univ. of Agricultural Sciences; Uppsala Sweden
3. Centre for Ecological and Evolutionary Synthesis (CEES), Dept of Biosciences, Univ. of Oslo; Oslo Norway
4. Norwegian Inst. for Nature Research; Trondheim Norway
5. Telemark Univ. College, Dept of Environmental and Health Sciences; Porsgrunn Norway
6. Inst. for Wildlife Biology and Game Management, Univ. for Natural Resources and Life Sciences; Vienna Austria