Caractérisation de la dynamique de population de l’épinoche à trois épines, Gasterosteus aculeatus, dans un mésocosme lotique : Application à l'évaluation des effets du bisphénol A dans un contexte écosystémique.

Abstract : Ecotoxicity tests in ecosystemic conditions, such as those that can be performed in mesocosms, providea substantial ecological relevance. They permit to integrate complex inter-species interactions, interactionsbetween the organisms and the environmental conditions, and permit to assess perturbations witha systemic view. However, in return, these systems present a high variability that should be reduced,through experimental standardization or by identifying explicative factors, to better assess the differencebetween the outputs of the different treatments. In this thesis, we also focused on one species, of fish,the three-spined stickleback (Gasterosteus aculeatus), considering that it is good indicator of the healthstatus of the experimental ecosystem. We suggest that is more appropriate to focus on an integrativespecies in parallel to a global analysis in the context of mesocosms studies.The goal of this thesis was thus to better understand sticklebacks population dynamics in INERIS mesocosmsto improve the experimental protocols and the data analysis in ecotoxicity studies. To achieve thisgoal, studies were performed to characterize life cycle traits and processes of the species ; an experimentalprotocol was proposed to perform mesocosms studies with a focus on fish population dynamics; the datafrom two years of mesocosms studies in control conditions permitted to better understand the confoundingfactors ; we applied the methodolgoy to assess the effects of bisphenol A (BPA) on fish populationdynamics with expsoure concentrations 0, 1, 10 and 100 μg/L BPA.We could describe and explain stickleback population dynamics divided by four periods: first a massiveabundance increase due to the first reproduction of the founders in the mesocosms; second an importantdecrease due to the saturation of the system ; third a short increase ; finaly a new drop due to the endof reproduction. For BPA, effects were observed both at individual and at population levels.
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Goulwen De Kermoysan. Caractérisation de la dynamique de population de l’épinoche à trois épines, Gasterosteus aculeatus, dans un mésocosme lotique : Application à l'évaluation des effets du bisphénol A dans un contexte écosystémique.. Ecologie, Environnement. AgroParisTech, 2013. Français. ⟨NNT : 2013AGPT0050⟩. ⟨tel-01127055⟩

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