1. Institute of Landscape Ecology, University of Münster, Münster, Germany
2. Khinganskiy Federal Nature Reserve, Ministry of Nature Resources and Ecology, Arkhara, Russia
3. Alfred Wegener Institute Helmholtz Center for Polar and Marine Research, Polar Terrestrial Environmental Systems, Potsdam, Germany
4. Department of Life Sciences and Systems Biology, University of Turin, Torino, Italy
5. Department Bird Migration, Swiss Ornithological Institute, Sempach, Switzerland