Adult female loggerhead turtles around Japan 1999

Occurrence Observation
Latest version published by OBIS-SEAMAP on Oct 8, 2025 OBIS-SEAMAP
Home:
https://seamap.env.duke.edu/dataset/1656
Publication date:
8 October 2025
Published by:
OBIS-SEAMAP
License:
CC-BY-NC 4.0

Download the latest version of this resource data as a Darwin Core Archive (DwC-A) or the resource metadata as EML or RTF:

Data as a DwC-A file download 251 records in English (27 KB) - Update frequency: not planned
Metadata as an EML file download in English (14 KB)
Metadata as an RTF file download in English (12 KB)

Description

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.

Data Records

The data in this occurrence resource has been published as a Darwin Core Archive (DwC-A), which is a standardized format for sharing biodiversity data as a set of one or more data tables. The core data table contains 251 records.

This IPT archives the data and thus serves as the data repository. The data and resource metadata are available for download in the downloads section. The versions table lists other versions of the resource that have been made publicly available and allows tracking changes made to the resource over time.

Versions

The table below shows only published versions of the resource that are publicly accessible.

How to cite

Researchers should cite this work as follows:

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.

Rights

Researchers should respect the following rights statement:

The publisher and rights holder of this work is OBIS-SEAMAP. This work is licensed under a Creative Commons Attribution Non Commercial (CC-BY-NC 4.0) License.

GBIF Registration

This resource has been registered with GBIF, and assigned the following GBIF UUID: 9ad9750a-e1ec-4764-99a5-3694e9cbaff9.  OBIS-SEAMAP publishes this resource, and is itself registered in GBIF as a data publisher endorsed by Ocean Biodiversity Information System.

Keywords

Marine Biology; Telemetry; Tagged animal; Marine Animal Survey; Sea turtles; Animal tagging; Radio transmitters; Occurrence; Observation

External data

The resource data is also available in other formats

OBIS-SEAMAP Dataset Page https://seamap.env.duke.edu/dataset/1656 UTF-8 Interactive map
FGDC Metadata https://seamap.env.duke.edu/dataset/1656/fgdc UTF-8 XML
EML Metadata https://seamap.env.duke.edu/dataset/1656/eml UTF-8 XML

Contacts

Hideo Hatase
  • Owner ●
  • Originator ●
  • Point Of Contact
  • Primary contact
Atmosphere and Ocean Research Institute, The University of Tokyo (Hatase)
OBIS-SEAMAP
  • Metadata Provider ●
  • Distributor
Marine Geospatial Ecology Lab, Duke University
  • A328 LSRC building
27708 Durham
NC
US

Geographic Coverage

Oceans,Japan

Bounding Coordinates South West [28.427, 121.707], North East [40.405, 160.008]

Taxonomic Coverage

Scientific names are based on the Integrated Taxonomic Information System (ITIS).

Species Caretta caretta (Loggerhead sea turtle)

Temporal Coverage

Start Date / End Date 1999-07-20 / 2000-01-16

Project Data

No Description available

Title Adult female loggerhead turtles around Japan 1999
Funding NA

The personnel involved in the project:

Hideo Hatase
  • Owner

Sampling Methods

NA

Study Extent NA

Method step description:

  1. NA

Collection Data

Collection Name zd_1656
Collection Identifier zd_1656
Parent Collection Identifier OBIS-SEAMAP

Bibliographic Citations

  1. 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.