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Loggerhead turtle movement off the coast of Taiwan
Parker D., G. Balazs and J. Polovina. 2015. Loggerhead turtle movement off the coast of Taiwan. Data downloaded from OBIS-SEAMAP (http://seamap.env.duke.edu/dataset/1304) on yyyy-mm-dd.
Availability: This dataset is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
Notes: Only data aggregated per 1-degree cell are available through OBIS. The non-aggregated data are available through the OBIS-SEAMAP Portal
The purpose of this dataset is to define habitat use of loggerhead sea turtle, Caretta caretta in the Pacific Ocean Basin. more
Satellite tags were attached to 34 non-reproductive loggerhead turtles (Caretta caretta) caught as bycatch in the Taiwanese coastal poundnet fishery from 2002 to 2008. Transmission durations ranged from 6 to 503 d (median 172 d), with 5860 d tracked in total. Horizontal track data were processed using the Bayesian state-space modelling to extract the most likely daily positions, taking into account ARGOS data quality and other forms of statistical error. A region of high occupancy in the East China Sea, covering 433 549 km2 of coastal and pelagic area next to Taiwan, China, Japan, and South Korea, was characterized from the tracking data. Various attributes of this hotspot are described using satellite tracks and remotely sensed data. The tracks were merged with oceanographic data, emphasizing a new global dataset characterizing mesoscale eddies from satellite altimetry data. A proximity-probability approach coupled with odds ratio testing was used to infer orientation to eddy features. Comparisons against random points, simulated particle tracks, and drifter buoys were used to demonstrate turtle differential responses to eddies inside and outside the hotspot, depending on eddy features (i.e. cyclonic vs. anticyclonic, edges vs. centres). Turtles inside the hotspot utilize fewer strong cyclonic eddy edges than those outside.
Metadata for individual animals / trackings including PTT Type, Duty cycle, Date deployed, Deployment location, Tag nos., Final location, Date terminated, Distance traveled, Transmitting days, Mean Speed of Travel, Capture status are available upon request.
Only data aggregated per 1-degree cell are available through OBIS. The non-aggregated data are available from the OBIS SEAMAP Portal.
Biology > Reptiles
Marine, Satellite tracking, ISEW, Taiwan, Caretta caretta
ISEW, Taiwan [Marine Regions]
5 May 2002 - 4 August 2012
Caretta caretta (Linnaeus, 1758) [WoRMS]
Habitat use, Occurrence of biota
OBIS-SEAMAP: Spatial Ecological Analysis of Megavertebrate Populations, more
Dataset status: Completed
Data type: Data
Data origin: Monitoring
Metadatarecord created: 2016-05-26
Information last updated: 2016-06-30