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Dynamique des interactions biofilm/macro-organismes : conséquences sur les organismes et les propriétés hydrauliques et écologiques de l'interface eau/sédiment

Abstract : With the global increase of the population, groundwater reserves are increasingly exploited. To circumvent this problem, managed aquifer recharge systems using surface water are used worldwide. Nevertheless, the hydraulic performance of these systems is often altered by physical, chemical or biological clogging. This work aim to test the sustainability of ecological engineering solution based on the introduction of the gastropod, V. viviparus, to attenuate the clogging of the water/sediment interface of infiltration basins use for the recharge of the Rhône river aquifer. Two sections have been addressed with experimental approaches, (1) dynamic of biofilm/grazer interaction and its consequences on the physiological state of the gastropod and (2) dynamic of biofilm/grazer interaction and its consequences on the hydraulic and ecological properties of the water/sediment interface. Results show that (1) V. viviparus is able to survive in the infiltration basins at contrasted seasons, (2) V. viviparus can attenuate the biological clogging of the water/sediment interface, ether by trophic interaction (grazing) or physical actions (crawling activity, pelletization), and (3) V. viviparus has no positive effect on infiltration in case of chemical clogging. To conclude, V. viviparus appears to be a good candidate for ecological engineering solutions aiming to preserve and restore water/sediment interface impacted by biological clogging. This work provides useful information for the study of natured based solutions at larger scale (experimental pilot) and in natural ecosystems as wetlands
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Valerian Estragnat. Dynamique des interactions biofilm/macro-organismes : conséquences sur les organismes et les propriétés hydrauliques et écologiques de l'interface eau/sédiment. Ecologie, Environnement. Université de Lyon, 2019. Français. ⟨NNT : 2019LYSE1084⟩. ⟨tel-02527169⟩

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