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Caractéristiques maternelles, performances et stratégies de reproduction des tortues marines de Guyane

Abstract : Organisms face trade-offs between their reproduction, maintenance and survival, from which result adaptative strategies at the energetics, behavioural and ecological levels.This PhD work investigates the reproductive strategies used by leatherback turtles, Dermochelys coriacea, nesting in French Guiana. We investigated maternal characteristics, reproductive output, and the possible links between migration and reproduction in a population of known identity, studied through a unique longitudinal monitoring, based on complementary approaches combining biometry, physiology and molecular biology.First, we found that leatherback turtles are capital breeders, i.e. females’ reproductive output displayed during their nesting season relies on body reserves previously stored during their migration. Second, we suggested that leatherback females adjust the duration of the migration according to the oceanographic conditions they experienced during migration. At a lifetime scale, this may allow females to face the trade-off between current and future reproductions. Finally, our approach highlights the importance to take into account individual characteristics in order to better understand reproductive strategies, and further assess realistic models of population dynamics, particularly when considering emblematic species such as sea turtles.
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  • HAL Id : tel-00867096, version 1

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Virginie Plot. Caractéristiques maternelles, performances et stratégies de reproduction des tortues marines de Guyane. Ecologie, Environnement. Université de Strasbourg, 2012. Français. ⟨NNT : 2012STRAJ100⟩. ⟨tel-00867096⟩

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