https://doi.org/10.82144/f8e64bfd https://www.gbif.org/dataset/9ad9750a-e1ec-4764-99a5-3694e9cbaff9 https://seamap.env.duke.edu/dataset/1656 https://obis.org/dataset/08e9a21c-7acf-4b63-96dc-34e7a3611fcd Hideo Hatase Atmosphere and Ocean Research Institute, The University of Tokyo (Hatase) Primary contact hatase@aori.u-tokyo.ac.jp OBIS-SEAMAP Marine Geospatial Ecology Lab, Duke University

A328 LSRC building Durham NC 27708 US

seamap-contact@duke.edu https://seamap.env.duke.edu OBIS-SEAMAP Marine Geospatial Ecology Lab, Duke University

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seamap-contact@duke.edu https://seamap.env.duke.edu distributor Hideo Hatase Atmosphere and Ocean Research Institute, The University of Tokyo (Hatase) Primary contact hatase@aori.u-tokyo.ac.jp owner 2025-09-11 eng Original provider: Atmosphere and Ocean Research Institute, University of Tokyo Dataset credits: Hideo Hatase, Atmosphere and Ocean Research Institute, University of Tokyo Abstract: Stable isotope analyses and satellite telemetry were used to investigate the relationship between the body size and feeding habitat of adult female loggerhead turtles Caretta caretta around Japan. A total of 149 females from 2 nesting sites, 600 km apart, 1 in Minabe and 1 in Yakushima, was examined by stable isotope analyses of the egg-yolk in 1998 and 1999. Since there were neither significant intra- nor inter-clutch variations in δ13C or δ15N egg-yolks from the same female, the isotope signatures of a single egg-yolk from any clutch in a nesting season could be used to represent those of its nesting female. Both isotopic values increased as the body size of the nesting female increased, irrespective of nesting site. Comparisons between isotopic values of loggerhead egg-yolks and prey items revealed size-related differences among both feeding habits (planktonic or benthic) and habitat areas (pelagic or neritic) of female loggerheads. In 1999, 5 females nesting in Minabe were tracked by satellite. After the nesting season, 2 females with low isotopic values migrated to the pelagic Pacific along the Kuroshio Current, whereas 3 with high isotopic values migrated to the neritic East China Sea. The former females were smaller than the latter. These results were consistent with inferences from stable isotope analyses and previous findings, indicating that the body size, habitat area, and feeding habit of female loggerheads around Japan are closely related. In addition, there were no significant differences in δ13C or δ15N between recruits and remigrants, implying that female loggerheads do not change their feeding habitats during the reproductive stage. We postulate that female habitat selection as a function of body size is closely related to the recruitment and settlement in immature loggerheads, which return to Japan after developmental migrations in the North Pacific. Marine Biology Telemetry Tagged animal Marine Animal Survey Sea turtles Animal tagging Radio transmitters N/A This work is licensed under a Creative Commons Attribution Non Commercial (CC-BY-NC) 4.0 License. https://seamap.env.duke.edu/dataset/1656 Oceans,Japan 121.707 160.008 40.405 28.427 1999-07-20 2000-01-16 Scientific names are based on the Integrated Taxonomic Information System (ITIS). species Caretta caretta Loggerhead sea turtle notPlanned Hideo Hatase Atmosphere and Ocean Research Institute, The University of Tokyo (Hatase) Primary contact hatase@aori.u-tokyo.ac.jp NA NA NA Hideo Hatase owner NA zd_1656 2025-09-11T15:40:29-04:00 dataset Hatase, H. 2017. Adult female loggerhead turtles around Japan 1999. Version 1.0.0. Dataset published in OBIS-SEAMAP. https://doi.org/10.82144/f8e64bfd. Hatase H, Takai N, Matsuzawa Y, Sakamoto W, Omuta K, Goto K, Arai N, Fujiwara T. 2002. Size-related differences in feeding habitat use of adult female loggerhead turtles Caretta caretta around Japan determined by stable isotope analyses and satellite telemetry. Marine Ecology Progress SeriesVol. 233: 273-281. OBIS-SEAMAP Dataset Page UTF-8 Interactive map https://seamap.env.duke.edu/dataset/1656 FGDC Metadata UTF-8 XML https://seamap.env.duke.edu/dataset/1656/fgdc EML Metadata UTF-8 XML https://seamap.env.duke.edu/dataset/1656/eml OBIS-SEAMAP zd_1656 zd_1656