1. School of Natural Resources University of Missouri Columbia Missouri USA
2. National Parks and Wildlife Service Wexford Wildfowl Reserve, North Slob Wexford Y35 KPA9 Ireland
3. Glencairn, Bruichladdich Isle of Islay PA49 7UN UK
4. Centre for Ecology and Conservation College of Life and Environmental Sciences University of Exeter, Cornwall Campus Penryn TR10 9EZ UK
5. Wildfowl & Wetlands Trust, Slimbridge Gloucester GL2 7BT UK
6. Department of Bioscience Aarhus University Kalø, Grenåvej 14 Rønde DK‐8410 Denmark