![]() These deep dives may have evolved to reduce silhouetting against the surface, which would make turtles more susceptible to visual predators such as large sharks. These results suggest that green turtles crossing the Atlantic do not behave invariantly, but instead alternate between periods of travelling just beneath the surface and diving deeper. TDRs revealed that much of the time was spent conducting short (2-4 min), shallow (approximately 0.9-1.5 m) dives, consistent with predictions for optimisation of near-surface travelling, while long (typically 20-30 min), deep (typically 10-20 m) dives had a distinctive profile found in other marine reptiles. Satellite telemetry revealed that most submergences were short (20 min), particularly at night. In 1982, Ascension Island was used as a staging post for the British Task Force. The island was managed by the head of the Eastern Telegraph Company on the island until 1964 when the British Government appointed an Administrator to represent the Governor of Saint Helena on Ascension. ![]() ![]() Boat trips and divers anchor off its shores and dolphins often play around. In 1922, Ascension was made a dependency of Saint Helena. Satellite telemetry was used to record the submergence duration of green turtles (Chelonia mydas) as they migrated from Ascension Island to Brazil (N=12 individuals) while time/depth recorders (TDRs) were used to examine the depth distribution and dive profiles of individuals returning to Ascension Island to nest after experimental displacement (N=5 individuals). St Helena Island - Dive Discovery Dive & Explore Incredible St Helena Pro Dive Travel Scuba Diving in St. Falkland Islands Pre deployment information Ascension Island: a short guide.
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