1. Alan J. D. Tennyson, Museum of New Zealand Te Papa Tongarewa, P.O. Box 467, Wellington 6140, New Zealand, e-mail: .
2. Alexander L. Bond, Bird Group, Dept. of Life Sciences, Natural History Museum, Akeman Street, Tring, Herts. HP23 6AP, UK, e-mail: .
3. Joanne H. Cooper, Bird Group, Dept. of Life Sciences, Natural History Museum, Akeman Street, Tring, Herts. HP23 6AP, UK, e-mail: .
4. Johannes H. Fischer, Aquatic Unit, Dept. of Conservation, Wellington, New Zealand, e-mail: