1. Norwegian Institute for Nature Research; P.O. Box 5685 Slupen, NO-7485 Trondheim Norway
2. Research Institute of Wildlife Ecology; Vetmeduni Vienna, Savoyenstrasse 1 A-1160 Vienna Austria
3. Deutingerstraße 15; D-82487 Oberammergau Germany
4. Center for Functional and Evolutionary Ecology (UMR 5175 CNRS); 1919, route de Mende F-34293 Montpellier France
5. Biology and Biotechnologies; University of Rome La Sapienza; viale Università 32 I-00185 Rome Italy