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Distribution et comportement de plongée des tortues marines de Guyane française sous l'influence des structures océanographiques

Abstract : The strong heterogeneity of the marine ecosystem leads to a patchy distribution of the resources in time and space, shaping therefore the movements of sea turtles. Considered as the most dynamic ecosystem in the world, the Guiana shield is a highly dynamic system which hosts three of the seven sea turtle species in the world (the olive ridley, the green turtle and the leatherback turtle). The aim of this thesis was to understand how the oceanographic constraints can influence the at-sea movements of these three species during the reproduction and the migration phases. The deployment of 55 satellite tags on adult females in French Guiana provided information on their trajectories, their diving behavior and on the environment encountered. Our study shows a strong behavioral plasticity between species, which seems to be mainly dictated by the reproductive traits and strategies, the local conditions of the habitat and the physiological adaptations.
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Submitted on : Thursday, March 8, 2018 - 6:45:09 PM
Last modification on : Saturday, June 6, 2020 - 3:25:13 AM
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Philippine Chambault. Distribution et comportement de plongée des tortues marines de Guyane française sous l'influence des structures océanographiques. Biologie animale. Université de Strasbourg, 2017. Français. ⟨NNT : 2017STRAJ030⟩. ⟨tel-01727120⟩

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