Affiliation: | 1. National Wildlife Management Centre, Animal Health and Veterinary Laboratories Agency, Sand Hutton, York, YO41 1LZ, UK 2. Department of Management and Sustainable Use, Research Institute for Nature and Forest (INBO), Kliniekstraat 25, B-1070, Brussels, Belgium 3. Office National de la Chasse et de la Faune Sauvage, Direction des Etudes et de la Recherche, CNERA Avifaune Migratrice, 39, Boulevard Einstein, CS 42355, 44323, Nantes Cedex 3, France 4. Wildlfowl and Wetlands Trust, Slimbridge, Gloucestershire, GL2 7BT, UK 5. Departamento de Biología de la Conservación, Estación Biológica de Do?ana (CSIC), C/Americo Vespucio s/n, 41092, Sevilla, Spain 6. School of Biology, Newcastle University, Newcastle-upon-Tyne, NE1 7RU, UK
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