1. Department of Animal Ecology; Netherlands Institute of Ecology (NIOO-KNAW); Wageningen The Netherlands
2. Theoretical and Computational Ecology; Institute for Biodiversity and Ecosystem Dynamics; University of Amsterdam; Amsterdam The Netherlands
3. Department of Animal Ecology; Utrecht University; Utrecht The Netherlands
4. Department of Bird Migration; Swiss Ornithological Institute; Sempach Switzerland
5. Sovon Dutch Centre for Field Ornithology; Den Burg The Netherlands