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PCB concentrations in plankton size classes, a temporal study in Marseille Bay, Western Mediterranean Sea

Authors: Tiano, Marion; Tronczyński, Jacek; Harmelin-Vivien, Mireille; Tixier, Céline; Carlotti, Francois;

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.

Country
France
Keywords

Chlorophyll, Food Chain, [SDE.MCG]Environmental Sciences/Global Changes, Zooplankton, Mediterranean Sea, PCBs, Biomass, Bay of Marseille, [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Carbon Isotopes, Nitrogen Isotopes, Atmosphere, [SDU.OCEAN] Sciences of the Universe [physics]/Ocean, Atmosphere, Plankton, Bioaccumulation, Polychlorinated Biphenyls, [SDE.BE] Environmental Sciences/Biodiversity and Ecology, [SDE.MCG] Environmental Sciences/Global Changes, Coastal, Bays, Phytoplankton, Seasons, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, Water Pollutants, Chemical, Environmental Monitoring

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