1. Division of Avian Conservation; Yamashina Institute for Ornithology; Abiko Japan
2. Hokkaido University Museum; Hokkaido University; Sapporo Japan
3. Institute of Boninology; Ogasawara Japan
4. Department of Fisheries and Wildlife; Hatfield Marine Science Center; Oregon State University; Newport OR USA
5. Endangered Species Branch; Anchorage Fish and Wildlife Field Office; Anchorage AK USA
6. Department of Biology; Toho University; Funabashi Japan