1. National Institute of Polar Research; Tachikawa Tokyo 190-8518 Japan
2. Graduate School of Fisheries Sciences; Hokkaido University; Hakodate Hokkaido 041-8611 Japan
3. Graduate School of Environmental Studies; Nagoya University; Nagoya Aichi 464-8601 Japan
4. Okinawa Regional Research Centre; Tokai University; Yaeyama−gun Okinawa 907−1541 Japan
5. Graduate School of Fisheries and Environmental Sciences; Institute for East China Sea Research; Nagasaki University; Taira-machi Nagasaki 851-2213 Japan
6. Department of Marine Bio-Science; Faculty of Life Science and Biotechnology; Fukuyama University; Fukuyama Hiroshima 729-0292 Japan
7. Division of Natural History; Yamashina Institute for Ornithology; Abiko Chiba 270-1145 Japan
8. Atmosphere and Ocean Research Institute; The University of Tokyo; Kashiwa Chiba 277-8564 Japan
9. Department of Bioengineering; Nagaoka University of Technology; Nagaoka Niigata 940-2188 Japan
10. Fukakusa Campus; Ryukoku University; Fushimi-ku Kyoto 612-8577 Japan
11. Japanese Bird Banding Association; Bird Migration Research Center; Yamashina Institute for Ornithology; Abiko Chiba 270-1145 Japan
12. Department of Polar Science; SOKENDAI (The Graduate University for Advanced Studies); Tachikawa Tokyo 190-8518 Japan