1. Marine Animal Ecology Group, Wageningen University, Droevendaalsesteeg 1, 6708 PB, Wageningen, the Netherlands
2. Wageningen University, Wageningen The Netherlands
3. United States Fish and Wildlife Service, Division of Migratory Bird Management, Branch of Assessments and Decision Support, 11510 American Holly Drive, Laurel, Maryland 20708, USA
4. Utrecht University, Utrecht, The Netherlands
5. U.S. Geological Survey South Carolina Cooperative Fish and Wildlife Research Unit, Clemson University, USA