1. Gunnar Austrheim, Museum of Natural History and Archaeology, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway - e-mail: gunnar.austrheim@vm.ntnu.no
2. Erling J. Solberg, Norwegian Institute for Nature Research, P.O. Box 5685 Sluppen, NO-7485 Trondheim, Norway - e-mail: erling.solberg@nina.no
3. Atle Mysterud, Centre for Ecological and Evolutionary Synthesis, Department of Biology, University of Oslo, P.O. Box 1066 Blindern, NO-0316 Oslo, Norway - e-mail: atle.mysterud@bio.uio.no