Contribution à la connaissance socio-écologique des opérations de restauration des hauts de falaises littorales de Bretagne

Abstract : Maritime clifftops might be considered as social-ecological systems where rare habitats (maritime heathland and clifftop vegetation) and multiples recreational uses (tourism, fishing, hiking) are coexisting. For more than fifty years, these uses are leading to important maritime clifftop habitat degradations. In reaction to these degradations, many restoration projects have been conducted for nearly 30 years. The thesis purpose is to carry out an assessment of restoration projects in order to improve future restoration projects by increasing knowledge about those social-ecological systems. This study is mostly based on 23 semi-structured interviews and 2 workshops conducted with restoration stakeholders, 465 vegetation monitoring plots set on 18 restored sites along Brittany’s coast and arthropods sampling conducted on three different sites.From these data, sociological, methodological, plant succession, arthropods and plant communities’ studies have been performed in order to put forward recommendations for future restoration projects planning and to highlight scientific needs. The need for a better consideration of restoration goals, in particular social goals, has been pointed out. Succession study has shown that, when habitat degradation is not too heavy, passive restoration is slow, but efficient on the long term. In highly degraded habitat thought, active restoration seems required to start restoration process. Complementary studies are still needed to adapt restoration method choice to different degradation and site contexts.
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Maxime Le Roy. Contribution à la connaissance socio-écologique des opérations de restauration des hauts de falaises littorales de Bretagne. Biodiversité et Ecologie. Université de Bretagne occidentale - Brest, 2019. Français. ⟨NNT : 2019BRES0034⟩. ⟨tel-02304748⟩

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