Abstract
Endangered loggerhead turtles (Caretta caretta) are highly migratory marine reptiles that spend extended maturation periods at sea. Although an understanding of the biology and ecology of juveniles is essential for effective conservation of this species, such information is still limited, especially for the North Pacific population. The first quantitative bycatch survey in northern Japan revealed that the Sanriku coastal area served as an important summer foraging habitat for large juvenile loggerhead turtles in the western North Pacific. To examine their year-round distribution and diving behaviour, we deployed satellite-relayed data loggers on six turtles (mean SCLn–t ± SD = 69.2 ± 9.2 cm, range = 58.3–82.5 cm). While turtles predominantly utilize the Sanriku coastal area and surrounding oceanic waters during summer, all turtles spent most of their time travelling in oceanic waters (>200 m) several kilometres east of Japan and sometimes in association with the Kuroshio Extension Current during winter. Although water temperature experienced by turtles significantly decreased during winter, they predominantly stayed in water >15 °C. There was no strong seasonal pattern in diving behaviour, and daily average dive duration was 20.9 ± 11.6 min regardless of summer or winter. In addition, turtles sporadically performed deep dives, including the deepest dive (>340 m) ever recorded for this species, during winter. These results suggest that juveniles remained active and possibly foraging in oceanic habitats throughout the winter rather than adopting the quiescent overwintering strategy (i.e. undertaking prolonged dives lasting >300 min) previously reported in adult females.
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Acknowledgments
This study was conducted with permission from the Ethics Committee of the University of Tokyo. This study could not be achieved without great volunteers from Fisheries Cooperative Association of Funakoshi Bay, Hirota Bay, Kamaishi Bay, Kamaishi-Tobu, Miyako, Ofunato, Okirai, Omoe, Otsuchi, Ryori, Sanriku-Yamada, Sasaki, Toni and Yoshihama for providing us with wild-caught sea turtles. We are grateful to Y. Fujiwara, H. Murasaki, K. Onizuka and S. Takuma for their assistance in collecting, measuring and handling the turtles. We gratefully acknowledge M. Kurosawa, K. Morita, J. Takada, M. Hirano, A. Koshida, R. Koshida, Y. Watanabe, N. Katsumata, E. Sawai and I. Nakamura for their assistance in the field. We also acknowledge NPO Everlasting Nature of Asia for recovering satellite-relayed data logger from a stranded turtle. Special thanks go to K. Aoki, H. Shimadzu, S. Isojunno and Y. Papastamatiou for lots of useful advices. This work was supported by the program ‘Bio-logging Science’, The University of Tokyo (UTBLS), a JSPS research grant (24241001 to KS), a JSPS Research Fellowship for Young Scientists to TN (21-7432) and a Sasakawa Scientific Research Grant from The Japan Science Society to TN (19-526). We also acknowledge the use of the Maptool (http://www.seaturtle.org/) program for the maps of study site. The AVHRR Oceans Pathfinder SST data were obtained from Physical Oceanography Distributed Active Archive Center (http://podaac.jpl.asa.gov). We thank two anonymous reviewers for the constructive comments. Finally, we would like to dedicate our work to all the people in our study site who were severely suffered by tsunami in 11 March 2011.
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Narazaki, T., Sato, K. & Miyazaki, N. Summer migration to temperate foraging habitats and active winter diving of juvenile loggerhead turtles Caretta caretta in the western North Pacific. Mar Biol 162, 1251–1263 (2015). https://doi.org/10.1007/s00227-015-2666-0
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DOI: https://doi.org/10.1007/s00227-015-2666-0