1 Department of Migration, Max Planck Institute of Animal Behavior, Am Obstberg 1, 78315, Radolfzell, Germany. [email protected].
2 Department of Biology, University of Konstanz, Universitätsstraße 10, 78464, Konstanz, Germany. [email protected].
3 Department of Migration, Max Planck Institute of Animal Behavior, Am Obstberg 1, 78315, Radolfzell, Germany.
4 Arctic Research Station of Institute of Plant and Animal Ecology, Ural Division Russian Academy of Sciences, 21 Zelenaya Gorka Str., Labytnangi, Yamal-Nenets Autonomous District, Russia, 629400.
5 Institute of Biological Problems of the North, Ulitsa Portovaya 18, Magadan, Russia, 685000.
6 Canada Research Chair in Polar and Boreal Ecology, Department of Biology, Université de Moncton, 18 Antonine-Maillet, Moncton, NB, E1A 3E9, Canada.