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Composition of green turtle feeding aggregations along the Japanese archipelago: implications for changes in composition with current flow |
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| Authors: | Hideaki Nishizawa Yuta Naito Hiroyuki Suganuma Osamu Abe Junichi Okuyama Koichi Hirate Shinichi Tanaka Emi Inoguchi Koji Narushima Kiyoshige Kobayashi Hisakazu Ishii Shigeo Tanizaki Masato Kobayashi Akira Goto Nobuaki Arai |
| Institution: | 1. Department of Social Informatics, Graduate School of Informatics, Kyoto University, Kyoto, 606-8501, Japan 3. Laboratory of Breeding Science, Graduate School of Fisheries Sciences, Hokkaido University, Hakodate, 041-8611, Japan 4. Everlasting Nature of Asia, Acty Part II 4F Nishi-Kanagawa 3-17-8, Kanagawa-ku, Yokohama, Kanagawa, 221-0822, Japan 5. Research Center for Subtropical Fisheries, Seikai National Fisheries Research Institute, Fisheries Research Agency, 148 Fukaiohta, Ishigaki, Okinawa, 907-0451, Japan 6. National Research Institute of Far Seas Fisheries, Fisheries Research Agency, 5-7-1 Orido, Shimizu, Shizuoka, 424-8633, Japan 2. Protected Resource Division, Southwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, 8901 La Jolla Shores Drive, La Jolla, CA, 92037, USA 7. Okinawa Prefectural Fisheries and Ocean Research Center, 1-3-1 Nishizaki, Itoman, Okinawa, 901-0305, Japan 8. Program in Environmental Management, Graduate School of Agriculture, Kinki University, 3327-204 Nakamachi, Nara, 631-8505, Japan 9. Ishigaki Island Sea Turtle Research Group, 2357-11 Arakawa, Ishigaki, Okinawa, 907-0024, Japan |
| Abstract: | In order to develop effective conservation strategies for endangered migratory species, the link between feeding and breeding grounds needs to be clarified. In this study, the genetic compositions of consecutive Japanese feeding aggregations of green turtles (Chelonia mydas) along the Kuroshio Current were examined by mixed-stock analyses of mitochondrial DNA control-region sequences. The results indicated that the southern feeding aggregation around Yaeyama (24.3°N, 124.0°E) was sourced from various Pacific rookeries in the Yaeyama, Ogasawara, Western Pacific, and Indian Oceans and Southeast Asia. Among northern feeding aggregations, the Ginoza (26.5°N, 128.0°E) aggregation was also sourced from the Western Pacific Ocean, but the Nomaike (31.4°N, 130.1°E), Muroto (33.2°N, 134.2°E), and Kanto (35.6°N, 140.5°E) aggregations were contributed mostly by the closer Ogasawara rookeries. The reduced contribution from tropical Pacific rookeries to northern feeding aggregations and the significant correlation between genetic differentiation and geographical distance matrices of feeding aggregations indicated that most hatchlings from these regions transported by the Kuroshio Current settle in upstream feeding grounds along the Japanese archipelago, implying that current flow influences the composition of feeding aggregations. Differences in the composition of relatively close neritic feeding aggregations have important conservation implications, for which both regional and multinational conservation strategies are needed. |
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