1. Department of Coastal Systems, NIOZ Royal Netherlands Institute for Sea Research, and Utrecht University, Post Office Box 59, 1790 AB Den Burg (Texel), Netherlands.
2. Centre for Integrative Ecology, School of Life and Environmental Sciences, Deakin University, Waurn Ponds Campus, Victoria 3217, Australia.
3. Conservation Ecology Group, Groningen Institute for Evolutionary Life Sciences (GELIFES), University of Groningen, Post Office Box 11103, 9700 CC Groningen, Netherlands.
4. Centre d'Ecologie Fonctionnelle et Evolutive, Unité Mixte de Recherche 5175, Campus Centre National de la Recherche Scientifique, 1919 Route de Mende, 34293 Montpellier Cedex 5, France.
5. Avian Ecophysiology Unit, Department of Vertebrate Ecology and Zoology, University of Gdańsk, Wita Stwosza 59, 80-308 Gdańsk, Poland.
6. Department of Vertebrate Zoology, Lomonosov Moscow State University, Moscow, 119991, Russia.