Role of cellular compartmentalization in the trophic transfer of mercury species in a freshwater plant-crustacean food chain

JOURNAL OF HAZARDOUS MATERIALS

卷:320

Article

Beauvais-Fluck, Rebecca¹  Chaumoth, Arnaud²  Gimbert, Frederic³  Queau, Herve²  Geffard, Olivier²  Slaveykova, Vera I.¹  Cosio, Claudia¹ 

[1] Univ Geneva, Fac Sci, Inst FA Forel Earth & Environm Sci, Environm Biogeochem & Ecotoxicol, 66 Bd Carl Vogt, CH-1205 Geneva, Switzerland

[2] Irstea, UR MALY Milieux Aquat Ecol & Pollut, Ctr Lyon Villeurbanne, F-69616 Villeurbanne, France

[3] Univ Bourgogne Franche Comte, UMR UFC CNRS USC INRA 6249, Dept Chronoenvironm, 16 Route Gray, F-25030 Besancon, France

关键词: Cell wall;    Depuration;    Intracellular;    Toxicokinetics;    Bioaccumulation;   

DOI  :  10.1016/j.jhazmat.2016.08.055

来源: Elsevier

【 摘 要 】

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 similar to 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. (C) 2016 Elsevier B.V. All rights reserved.

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