1. U.S. Geological Survey, Iowa Cooperative Fish and Wildlife Research Unit Iowa State University Ames Iowa USA
2. U.S. Geological Survey, Florida Cooperative Fish and Wildlife Research Unit University of Florida Gainesville Florida USA
3. Bird Conservancy of the Rockies Ft. Collins Colorado USA
4. U.S. Geological Survey, Eastern Ecological Science Center at the Patuxent Research Refuge Laurel Maryland USA
5. U.S. Geological Survey, Georgia Cooperative Fish and Wildlife Research Unit University of Georgia Athens Georgia USA
6. U.S. Geological Survey, Eastern Ecological Science Center at Leetown Kearneysville West Virginia USA
7. U.S. Fish and Wildlife Service, Northeast Fishery Center Lamar Pennsylvania USA
8. Atlantic States Marine Fisheries Commission Arlington Virginia USA
9. Delaware Division of Fish and Wildlife Dover Delaware USA
10. British Trust for Ornithology The Nunnery Norfolk UK