An odyssey of the green sea turtle: Ascension Island revisited

An odyssey of the green sea turtle: Ascension Island revisited.

Green turtles (Chelonia mydas) that nest on Ascension Island, in the south-central Atlantic, utilize feeding grounds along the coast of Brazil, more than 2000 km away. To account for the origins of this remarkable migratory behavior, Carr and Coleman [Carr, A. & Coleman, P. J. (1974) Nature (London) 249, 128-130] proposed a vicariant biogeographic scenario involving plate tectonics and natal ho...

Inter- and Intra-beach Thermal Variation for Green Turtle Nests on Ascension Island, South Atlantic

The navigational feats of green sea turtles migrating from Ascension Island investigated by satellite telemetry.

Previous tagging studies of the movements of green turtles (Chelonia mydas) nesting at Ascension Island have shown that they shuttle between this remote target in the Atlantic Ocean and their feeding grounds on the Brazilian coast, a distance of 2300 km or more. Since a knowledge of sea turtle migration routes might allow inferences on the still unknown navigational mechanisms of marine animals...

Temperature-dependent sex determination of Ascension Island green turtles

We examined the role played by temperature in the duration of incubation and sex ratio of green turtle hatchlings at Ascension Island, one of the most important green turtle rookeries in the Atlantic. Temperature at control sites at nest depth and in 39 green turtle nests was measured using small temperature recording devices. The sex ratio of hatchlings was ascertained in a sub-sample of monit...

Some case histories from Ascension Island.

THE physician of today is aware of the numerous adverse effects and potential hazards of modern drug therapy, and it is both refreshing and instructive to look back to the days when the physician's 'armentarium' of therapeutic agents was of 'narrow spectrum', and when many of the 'drugs' available were basically only of 'nutritive' value. Such retrospective views, even though they are often bri...