Projet scientifique SELUNE MARITIME - Effets de l'arasement sur les biocénoses benthiques et le fonctionnement trophique de la Sélune maritime: état initial

In a nutshell: The draining of the two reservoirs associated with the Sélune dams will cause a change in the flow of sediments and organic or mineral substances that were previously trapped in the reservoirs downstream of the dams. This change could affect the bentho-demersal communities located further downstream, near the Bay of Mont Saint Michel, in the area known as the “small bay.” Objectives Conduct an initial (pre-drainage) assessment of the benthic and bentho-demersal communities in the Sélune and Sée estuaries (control), characterize the seasonal variability of these two communities in terms of composition and assemblage, integrate a functional approach to the estuary by including trophic dynamics through the analysis of stomach contents of fish species and the determination of all trophic sources using isotopic analysis techniques Data sampling of macrobenthic invertebrates and fish fauna isotopic analyses analysis of fish stomach contents (GCA) measurement of physicochemical parameters and analysis of grain size distribution