1. School of Biology, University of Leeds, Leeds LS2 9JT, UK.
2. Centre for Ecology and Conservation, University of Exeter, Penryn, Cornwall TR10 9EZ, UK.
3. British Trust for Ornithology, The Nunnery, Thetford IP24 2PU, UK.
4. The Royal Society for the Protection of Birds, Northern Ireland Headquarters, Belvoir Park Forest, Belfast BT8 4QT, UK.
5. School of Environmental Sciences, University of Liverpool, Environmental Sciences, Liverpool L69 3GP, UK.
6. CEFE-CNRS, 1919 Route de Mende, F-34293 Montpellier Cedex 5, France.
7. FitzPatrick Institute, Department of Science and Technology–National Research Foundation Centre of Excellence, University of Cape Town, Rondebosch 7701, South Africa.
8. Department of Zoology, School of Natural Sciences, Trinity College Dublin, Dublin 2, Ireland.
9. Coastal and Marine Research Centre, University College Cork, Cork, Ireland.
10. The Royal Society for the Protection of Birds, Sandy, Bedfordshire SG19 2DL, UK.
11. Biodiversité et gestion des territoires, Université de Rennes 1–UMR 7204, Muséum National d’Histoire Naturelle, 35042 Rennes Cedex, France.
12. Easter Craigie Dhu, Dunkeld, Perthshire PH8 0EY, UK.
13. Réserve naturelle des Sept-Iles, Ligue pour la Protection des Oiseaux, F-22560 Pleumeur Bodou, France.
14. Marine Biology and Ecology Research Centre, Plymouth University, Plymouth PL4 8AA, UK.
15. Centre for Ecology and Hydrology, Penicuik EH26 0QB, UK.
16. Environment and Sustainability Institute, University of Exeter, Penryn, Cornwall TR10 9EZ, UK.