[Source_Name: Short_Name='RADIO TRANSMITTERS']
NMFS-PIFSC Turtle TrackingEntry ID: seamap320
Abstract: Satellite telemetry from 26 loggerhead (Caretta caretta) and 10 olive ridley (Lepidochelys olivacea) sea turtles captured and released from pelagic longline fishing gear provided information on the turtles' position and movement in the central North Pacific. These data together with environmental data from satellite remote sensing are used to describe the oceanic habitat used by these turtles. The ... results indicate that loggerheads travel westward, move seasonally north and south primarily through the region 28-40 deg N, and occupy sea surface temperatures (SST) of 15-25 deg C. Their dive depth distribution indicated that they spend 40% of their time at the surface and 90% of their time at depths <40 m. Loggerheads are found in association with fronts, eddies, and geostrophic currents. Specifically, the Transition Zone Chlorophyll Front (TZCF) and the southern edge of the Kuroshio Extension Current (KEC) appear to be important forage and migration habitats for loggerheads. In contrast, olive ridleys were found primarily south of loggerhead habitat in the region 8-31 deg N latitude, occupying warmer water with SSTs of 23- 28 deg C. They have a deeper dive pattern than loggerheads, spending only 20% of their time at the surface and 60% shallower than 40 m. However, the three olive ridleys identified from genetics to be of western Pacific origin spent some time associated with major ocean currents, specifically the southern edge of the KEC, the North Equatorial Current (NEC), and the Equatorial Counter Current (ECC). These habitats were not used by any olive ridleys of eastern Pacific origin suggesting that olive ridleys from different populations may occupy different oceanic habitats.
Purpose: To determine movements of Loggerheads through out the Pacific ocean and to define their oceanic habitat.
CURRENTNESS REFERENCE: ground condition
SPATIAL REFERENCE INFORMATION - GEODETIC MODEL
Horizontal Datum Name: D_WGS_1984
Ellipsoid Name: WGS_1984
Semi-major Axis: 6378137.000000
Denominator of Flattening Ratio: 298.257224
Data Set Citation
Dataset Originator/Creator: National Marine Fisheries Service
Dataset Title: NMFS-PIFSC Turtle Tracking
Dataset Series Name: OBIS-SEAMAP
Dataset Release Date: 2006-02-10 10:57:42.930365-05
Dataset Release Place: http://seamap.env.duke.edu/
Dataset Publisher: OBIS-SEAMAP
Data Presentation Form: vector digital data
This data set description is a member of a collection. The collection is described in
Start Date: 1997-01-26Stop Date: 2001-10-23
Latitude Resolution: 0.000167 Decimal degrees
Longitude Resolution: 0.000167 Decimal degrees
Horizontal Resolution Range: 1 meter - < 30 meters
Access Constraints ACCESS CONSTRAINTS: Open public unless otherwise noted.
DISTRIBUTION LIABILITY: Not to hold OBIS-SEAMAP liable for errors in the data.
While we have made every effort to ensure the quality of the database, we
cannot guarantee the accuracy of these datasets. Also please refer to Use
Use Constraints 1. Not to use data contained in OBIS-SEAMAP in any publication, product, or
commercial application without prior written consent of the original data
provider. 2. To cite both the data provider and OBIS-SEAMAP appropriately after
approval of use is obtained. 3. Not to hold OBIS-SEAMAP liable for errors in
the data. While we have made every effort to ensure the quality of the
database, we cannot guarantee the accuracy of these datasets.
Data Set Progress
Distribution Format: Shapefile
Role: TECHNICAL CONTACT
Role: DIF AUTHOR
Email: efujioka at duke.edu
LSRC A321 Box 90328
Province or State: NC
Postal Code: 27708
Role: TECHNICAL CONTACT
Email: gbalazs at honlab.nmfs.hawaii.edu
National Marine Fisheries Service 2570 Dole Street
Province or State: HI
Postal Code: 96822-2396
Polovina, J, G. H. Balazs, E. A. Howell, D. M. Parker, M. P. Seki and P. H. Dutton. Forage and migration habitat of loggerhead (Caretta caretta) and olive ridley (Lepidochelys olivacea) sea turtles. 2004. Fisheries Oceanography. 13:1, pp.36-51.
Polovina, J. J., D. R. Kobayashi, D. M. Parker, M. P. Seki and G. H. Balazs. 2000. Turtles on the edge: movement of loggerhead turtles(Caretta caretta) along oceanic fronts, spanning longline fishing grounds in the central North Pacfic, 1997-1998. Fish. Oceanogr. 9, p. 71-82.
Polovina, J. J., E. Howell, D. M. Parker, and G. H. Balazs. 2003. Dive-depth distribution of loggerhead (Carretta carretta) and olive ridley (Lepidochelys olivacea) sea turtles in the central North Pacific: Might deep longline sets catch fewer turtles? Fish. Bull. 101 (1):189-193
Creation and Review Dates
DIF Creation Date: 2007-04-16
Last DIF Revision Date: 2008-01-13