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Approche écosystémique d'un futur parc éolien en Manche orientale : exemple du site de Dieppe-Le Tréport

Abstract : The French government has set a target of 23% of energetic consumption derived from renewable energy sources including Marine Renewable Energy for 2020. Eight offshore wind farms (OWF) are planned along the Atlantic-English Channel French coasts and among them Dieppe-Le Tréport site in the eastern part of the English Channel. In order to gain further knowledge on the ecosystem structure and functioning before the OWF installation, my PhD thesis is focused on the construction of an Ecopath Model on the wind farm site in comparison with similar benthic habitats from the English Channel. The collection of new data on biological compartments (zooplankton, suprabenthos, meiofauna, benthos and demersal fishes) are essential. Four cruises (summers 2014 /2015 and winters 2015 /2016) allowed toestimate the contribution of each zoological group in two main benthic habitats: i.e. sandy gravels and medium clean sands, founded on the site (about 30 km²), corresponding to two microbenthic communities well represented in the English Channel. Macrofauna was sampled with a Van Veen grab,suprabenthos with a modified Macer-Giroq sledge in one station from each benthic habitat (day and night sampling) and fish with a beam trawl in ten stations. A total of 1,584 demersal fishes has been collected and their stomach contents has been examined. The results show the importance of large bivalves in the benthic biomass whereas the crustaceans are preferential preys of fishes. This link is discussed within the trophic network between consumed and non-consumed species of benthic communities, and the concept trophic ‘cul de sac’.
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Jean-Philippe Pezy. Approche écosystémique d'un futur parc éolien en Manche orientale : exemple du site de Dieppe-Le Tréport. Ecologie, Environnement. Normandie Université, 2017. Français. ⟨NNT : 2017NORMC262⟩. ⟨tel-01919756⟩

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