1. Centre for Biodiversity and Conservation Biology, Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 1C6, Canada
2. Department of Zoology, University of Toronto, 25 Harbord Street, Toronto, Ontario M5S 3G5, Canada
3. Fundación Inalafquen, Pedro Morón 385, (8520) San Antonio Oeste, Río Negro, Argentina
4. Animal Ecology Group, Centre for Ecological and Evolutionary Studies, University of Groningen, PO Box 14, 9750 AA Haren, The Netherlands
5. Department of Marine Ecology and Evolution, Royal Netherlands Institute for Sea Research (NIOZ), PO Box 59, 1790 AB Den Burg, Texel, The Netherlands
6. Endangered and Nongame Species Program, New Jersey Division of Fish and Wildlife, PO Box 400, Trenton, NJ 08625-0400, USA
7. Centro de Pesquisas para Conservação das Aves Silvestres (CEMAVE–IBAMA), C. Postal 102, João Pessoa PB, CEP 58.440–970, Brazil
8. British Trust for Ornithology, The Nunnery, Thetford, Norfolk IP24 2PU, UK
9. Australasian Wader Studies Group, 165 Dalgetty Road, Beaumaris, Victoria 3193, Australia