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Volume Article Contents Abstract. Migration cues and timing in leatherback sea turtles. Sherrill-Mix , Scott A. Oxford Academic. Michael C. Ransom A. Revision received:. Cite Cite Scott A. Select Format Select format. Permissions Icon Permissions. Abstract Atlantic leatherback sea turtles migrate annually from foraging grounds off eastern Canada and the northeastern United States to southern foraging and breeding areas. Table 1 Results from stepwise Cox's proportional hazards modeling of the onset of migration in leatherback turtles tagged off Nova Scotia.
Open in new tab. Open in new tab Download slide. Google Scholar Crossref. Search ADS. Photosynthetic rates derived from satellite-based chlorophyll concentration. Climatic effects on timing of spring migration and breeding in a long-distance migrant, the pied flycatcher Ficedula hypoleuca.
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This adaptation combined with other physiological adaptations enable leatherbacks to dive deep into cold anaerobic waters as deep as metres and range into sub-arctic waters making them the most widely ranging among sea turtles. Leatherback turtles are adapted to a diet predominated by soft-bodied animals like the hydromedusae.
Migration patterns of leatherback turtles seem to follow thermal fronts and oceanic gyres, seeking areas of high productivity for soft-bodied invertebrates. Leatherback sea turtles nest at intervals of 2 to 3 years. They nest between 3 to 7 times per season, with an average of 9 — 16 days between each nesting. Each nest contains an average of eggs.
Eggs incubate for about 60 — 65 days before the hatchlings emerge. Like all sea turtles, the hatchling sex is determined by the incubation temperature. There are records of species having nested on the east and west coasts of mainland India up to the late s. But current nesting populations are entirely restricted to the Andaman and Nicobar islands. Surveys of the Andaman and Nicobar Islands conducted by Satish Bhaskar, a pioneer of sea turtle research in India, in the s, revealed significant leatherback nesting beaches on Great Nicobar Island.
Subsequent surveys by revealed that there were many leatherback nesting beaches in the Little Nicobar Island, each with several hundreds of nests per season. This nesting population of the Nicobars is now considered to be the largest population in the southern Asian region.
These nesting beaches were devastated during the December Indian Ocean tsunami and there is little information on the post-tsunami status of these nesting sites.
We also do not have any information about where the leatherback turtles of the region go once they have finished nesting. Some sea turtles are seasonal travelers. They like to find their food up north during summer months. These same turtles will then travel south for the winter where the water is much warmer. Once the females become adults, every few years they will then migrate to the beach they were born, this is called their natal beach.
There they will mate in the waters just offshore. Then at night, they will make their way to the beach to deposit eggs. After several weeks of laying multiple nests she will head off to find another habitat. Many biologists will attach satellite trackers to the shell of a turtle. This provides wonderful data, of forging ground, and their migration patterns.
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