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Influence of eddies on the migratory routes of the sea turtles in the Bay of Bengal

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The movement of sea turtle Olive Ridley ( Lepidochelys olivacea ) during their post‐nesting period is studied with reference to oceanic eddies delineated from satellite‐derived maps of sea surface temperature (SST), chlorophyll‐ a and mean sea level anomaly in the northwestern Bay of Bengal. Four turtles tagged off the coast of Orissa, India with an Argos platform terminal transmitter (PPT) were tracked by satellites in April 2001. The animals were tracked from April to August 2001. Transmission from three PTTs terminated in June 2001 in the offshore waters of Orissa, while the remaining PTT 14577 continued transmission until 10 August 2001 as far as the east coast of Sri Lanka. The cyclonic eddy and high productive features observed in satellite data were associated with anti‐clockwise rotation made by the animals off the coast of Orissa prior to June 2001. The turtle with PTT 14577 migrated further south to the coast of Sri Lanka through the boundary between offshore dipole eddies. The satellite data indicated the influence of eddies on the migration pattern of sea turtles in the western Bay of Bengal.

Document Type: Research Article


Affiliations: 1: National Remote Sensing Agency, Hyderabad, India 2: Berhampur University, Orissa, India

Publication date: August 10, 2006

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