title: What are the factors driving long-term changes of the suprabenthos in the Seine estuary?
abstract: A Before/During/After Control-Impact approach is used to assess the effects of Port 2000 on the suprabenthos in the North Channel (NC) of the Seine estuary during the period from September 2001 to October 2015. Since the beginning of Port 2000 construction (2002-2005), the NC is affected by an increase of salinity (marine influence) and input of sand. The suprabenthos changes are mainly characterised by an increase in species richness in the upper part of the NC and a decrease in species density and biomass of the dominant mysid species over time. Multiple stressors (natural and anthropogenic) have been operating simultaneously (hydrological changes, construction of Port 2000, supplementary dredging) rendering the interpretation of the biological changes difficult. Thus, the present results evidenced a combination of changes in the Seine Estuary not only attributed to the impact of the Port 2000 construction.
authors.affiliation: Normandie Univer., UNICAEN, UNIROUEN, Laboratoire Morphodynamique Continentale et Côtière, CNRS UMR 6143M2C, 24 rue des Tilleuls, F-14000 Caen, France. Electronic address: jean-philippe.pezy@unicaen.fr.
authors.forename: Jean-Philippe
authors.initials: JP
authors.lastname: Pezy
authors.affiliation: Normandie Univer., UNICAEN, UNIROUEN, Laboratoire Morphodynamique Continentale et Côtière, CNRS UMR 6143M2C, 24 rue des Tilleuls, F-14000 Caen, France.
authors.forename: Alexandrine
authors.initials: A
authors.lastname: Baffreau
authors.affiliation: Normandie Univer., UNICAEN, UNIROUEN, Laboratoire Morphodynamique Continentale et Côtière, CNRS UMR 6143M2C, 24 rue des Tilleuls, F-14000 Caen, France.
authors.forename: Jean-Claude
authors.initials: JC
authors.lastname: Dauvin
mesh_terms: D018533:Biomass; D058448:Biota; D063366:Estuaries; D005602:France; D054712:Salinity
keywords: Estuarine ecosystem; Hydrological discharges; Long-term survey; Port construction; Seine estuary; Suprabenthos