title: Role of cellular compartmentalization in the trophic transfer of mercury species in a freshwater plant-crustacean food chain.
abstract: Mercury (Hg) represents an important risk for human health through the food webs contamination. Macrophytes bioaccumulate Hg and play a role in Hg transfer to food webs in shallow aquatic ecosystems. Nevertheless, the compartmentalization of Hg within macrophytes, notably major accumulation in the cell wall and its impact on trophic transfer to primary consumers are overlooked. The present work focusses on the trophic transfer of inorganic Hg (IHg) and monomethyl-Hg (MMHg) from the intracellular and cell wall compartments of the macrophyte Elodea nuttallii - considered a good candidate for phytoremediation - to the crustacean Gammarus fossarum. The results demonstrated that Hg accumulated in both compartments was trophically bioavailable to gammarids. Besides IHg from both compartments were similarly transferred to G. fossarum, while for MMHg, uptake rates were ∼2.5-fold higher in G. fossarum fed with the cell wall vs the intracellular compartment. During the depuration phase, Hg concentrations in G. fossarum varied insignificantly suggesting that both IHg and MMHg were strongly bound to biological ligands in the crustacean. Our data imply that cell walls have to be considered as an important source of Hg to consumers in freshwater food webs when developing procedures for enhancing aquatic environment protection during phytoremediation programs.
authors: Environmental Biogeochemistry and Ecotoxicology, Institute F.-A. Forel, Earth and Environmental Sciences, Faculty of Sciences, University of Geneva, 66 bd Carl-Vogt, CH-1205 Geneva, Switzerland. Electronic address: Rebecca.Flueck@unige.ch.
authors: Rebecca
authors: R
authors: Beauvais-Flück
authors: Irstea, UR MALY Milieux Aquatiques, ÿcologie et Pollutions, Centre de Lyon-Villeurbanne, F-69616 Villeurbanne, France. Electronic address: arnaud.chaumot@irstea.fr.
authors: Arnaud
authors: A
authors: Chaumot
authors: Department of Chrono-Environment, University of Bourgogne Franche-Comté, UMR UFC/CNRS 6249 USC INRA, 16 route de Gray, F-25030 Besançon Cedex, France. Electronic address: frederic.gimbert@univ-fcomte.fr.
authors: Frédéric
authors: F
authors: Gimbert
authors: Irstea, UR MALY Milieux Aquatiques, ÿcologie et Pollutions, Centre de Lyon-Villeurbanne, F-69616 Villeurbanne, France. Electronic address: herve.queau@irstea.fr.
authors: Hervé
authors: H
authors: Quéau
authors: Irstea, UR MALY Milieux Aquatiques, ÿcologie et Pollutions, Centre de Lyon-Villeurbanne, F-69616 Villeurbanne, France. Electronic address: olivier.geffard@irstea.fr.
authors: Olivier
authors: O
authors: Geffard
authors: Environmental Biogeochemistry and Ecotoxicology, Institute F.-A. Forel, Earth and Environmental Sciences, Faculty of Sciences, University of Geneva, 66 bd Carl-Vogt, CH-1205 Geneva, Switzerland. Electronic address: Vera.Slaveykova@unige.ch.
authors: Vera I
authors: VI
authors: Slaveykova
authors: Environmental Biogeochemistry and Ecotoxicology, Institute F.-A. Forel, Earth and Environmental Sciences, Faculty of Sciences, University of Geneva, 66 bd Carl-Vogt, CH-1205 Geneva, Switzerland. Electronic address: Claudia.Cosio@unige.ch.
authors: Claudia
authors: C
authors: Cosio
mesh_terms: D033304:Amphipoda / Q000378:metabolism*; D000818:Animals; D002473:Cell Wall / Q000378:metabolism*; D020387:Food Chain; D031321:Hydrocharitaceae / Q000378:metabolism*; D008628:Mercury / Q000378:metabolism*; D059828:Plant Cells / Q000378:metabolism
chemical_list: D008628:Mercury
keywords: Bioaccumulation; Cell wall; Depuration; Intracellular; Toxicokinetics