1. Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Amsterdam, Netherlands;
2. Department of Bird Migration, Swiss Ornithological Institute, Sempach, Switzerland;
3. Center for Ecology and Conservation, and Environment and Sustainability Institute, University of Exeter, Penryn, Cornwall, United Kingdom;
4. Research Institute for Nature and Forest (INBO), Brussels, Belgium;
5. Center for Avian Population Studies, Cornell Lab of Ornithology, Cornell University, Ithaca, New York;
6. Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Amsterdam, and Royal Netherlands Air Force, Breda, Netherlands;
7. Finnish Meteorological Institute, Helsinki, Finland;
8. GLOBE Institute, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark;
9. Royal Netherlands Meteorological Institute, De Bilt, and Hydrology and Quantitative Water Management, Wageningen University, Wageningen, Netherlands