title: PCB concentrations in plankton size classes, a temporal study in Marseille Bay, Western Mediterranean Sea.
abstract: PCB levels in plankton were investigated in the Bay of Marseille, Western Mediterranean Sea, between September 2010 and October 2011. Concentrations of PCB congeners (CB 18, CB 52, CB 101, CB 118, CB 138, CB 153, CB 180) were determined in three plankton size-classes (60-200, 200-500 and 500-1000μm) together with different parameters: chlorophyll content, plankton dry-weight biomass, carbon and nitrogen stable isotope ratios and plankton-community structure. The ∑PCB7 concentrations ranged between 14.2 and 88.1ngg(-1)d.w., for all size classes and all sampling periods. The results do not show the biomass dilution effect and indicate moderate but significant biomagnification with plankton trophic position estimated by δ(15)N signatures. Equilibrium with water phase may notably contribute in controlling the PCB levels in the plankton. More generally, presented results imply that PCB accumulation in the plankton is an effect of abiotic and trophic complex interactions in the Bay of Marseille.
authors.affiliation: Aix Marseille Université, CNRS, Université de Toulon, IRD, MIO UM 110, 13288 Marseille, France; IFREMER, Centre Atlantique, Ressources Biologique et Environnement (RBE), Unité Biogéochimie et Ecotoxicologie, Laboratoire LBCO, rue de l'Ile d'Yeu, 43311 Nantes, Cedex 03, France.
authors.forename: Marion
authors.initials: M
authors.lastname: Tiano
authors.affiliation: IFREMER, Centre Atlantique, Ressources Biologique et Environnement (RBE), Unité Biogéochimie et Ecotoxicologie, Laboratoire LBCO, rue de l'Ile d'Yeu, 43311 Nantes, Cedex 03, France. Electronic address: Jacek.Tronczynski@ifremer.fr.
authors.forename: Jacek
authors.initials: J
authors.lastname: Tronczyński
authors.affiliation: Aix Marseille Université, CNRS, Université de Toulon, IRD, MIO UM 110, 13288 Marseille, France.
authors.forename: Mireille
authors.initials: M
authors.lastname: Harmelin-Vivien
authors.affiliation: IFREMER, Centre Atlantique, Ressources Biologique et Environnement (RBE), Unité Biogéochimie et Ecotoxicologie, Laboratoire LBCO, rue de l'Ile d'Yeu, 43311 Nantes, Cedex 03, France.
authors.forename: Céline
authors.initials: C
authors.lastname: Tixier
authors.affiliation: Aix Marseille Université, CNRS, Université de Toulon, IRD, MIO UM 110, 13288 Marseille, France.
authors.forename: François
authors.initials: F
authors.lastname: Carlotti
mesh_terms: D061006:Bays; D018533:Biomass; D002247:Carbon Isotopes / Q000032:analysis; D002734:Chlorophyll / Q000032:analysis; D004784:Environmental Monitoring; D020387:Food Chain; D008522:Mediterranean Sea; D009587:Nitrogen Isotopes / Q000032:analysis; D010933:Plankton / Q000737:chemistry*; D011078:Polychlorinated Biphenyls / Q000032:analysis*; D012621:Seasons; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D002247:Carbon Isotopes; D009587:Nitrogen Isotopes; D014874:Water Pollutants, Chemical; D002734:Chlorophyll; D011078:Polychlorinated Biphenyls; C014024:2,4,5,2',4',5'-hexachlorobiphenyl
keywords: Bay of Marseille; Bioaccumulation; Coastal; PCBs; Phytoplankton; Zooplankton