Affiliation: | 1. Department of Wildlife, Fish, and Environmental Studies, Swedish University of Agricultural Sciences, Ume?, Sweden;2. Department of General Ecology and Limnology, Zoological Institute of the University of Cologne, Ecological Field Station Grietherbusch, Cologne, Germany;3. Theoretical Biology Group, Centre for Ecological and Evolutionary Studies, University of Groningen, Groningen, The Netherlands |