1. Department of Environmental Science, Institute for Wetland and Water Research, Faculty of Science; Radboud University; P.O. Box 9010 NL-6500 GL Nijmegen The Netherlands
2. Global Mammal Assessment Program, Department of Biology and Biotechnologies; Sapienza Università di Roma; Viale dell'Università 32 00185 Rome Italy
3. Institute of Zoology; Zoological Society of London; Regent's Park London NW1 4RY U.K.
4. Centre for Biodiversity and Environment Research; University College London; Gower Street London WC1E 6BT U.K.
5. PBL Netherlands Environmental Assessment Agency; P.O. Box 30314 NL-2500 GH, The Hague The Netherlands
6. Centre Manche-Mer du Nord; Ifremer 150 quai Gambetta, BP 699, 62321, Boulogne-sur-Mer France