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Article

Influence of Macrophyte and Gut Microbiota on Mercury Contamination in Fish: A Microcosms Study

1
Université de Bordeaux-CNRS, EPOC, UMR 5805, F-33120 Arcachon, France
2
Université de Pau et des Pays de l’Adour, E2S UPPA, CNRS, IPREM, Institut des Sciences Analytiques et de Physico-chimie pour l’Environnement et les matériaux, 64000 Pau, France
3
IMS UMR 5218, Cognitique, ENSC-BdxINP, 33400 Bordeaux, France
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(4), 1500; https://doi.org/10.3390/app10041500
Received: 1 February 2020 / Revised: 14 February 2020 / Accepted: 17 February 2020 / Published: 22 February 2020
The freshwater lakes of southwestern France are subject to the development of invasive macrophytes which are associated with mercury (Hg) contamination of the food web. The aim of this study was to determine the bioavailability of methylmercury (MeHg) produced by plant roots in aquatic ecosystems. A microcosm experiment was performed using isotopically enriched inorganic Hg at environmental concentrations (1 µg 199IHg·L−1). For all conditions, total Hg in fish as well as Hg species associated with different compartments (water, sediments, plant roots, fish) were analyzed by gas chromatography-inductively coupled plasma-mass spectrometry (GC-ICP-MS). In addition, sediment, plants, and fish gut microbiota were studied by MiSEQ sequencing. Some strains were isolated and tested for their ability to methylate Hg. The results revealed 199MeHg production in plant roots and the presence of this form in fish (tissues and gut), highlighting a MeHg trophic transfer. Moreover, methylator bacteria were identified from the gut contents of the fish when they were in the presence of plants. Some of them were related to bacteria found in the plant roots. On the basis of these results, the transfer of MeHg and bacteria from plants to fish is highlighted; in addition, Hg methylation is strongly suspected in the fish gut, potentially increasing the Hg bioaccumulation. View Full-Text
Keywords: mercury isotopes; microcosms; macrophyte; periphyton; fish; bacteria mercury isotopes; microcosms; macrophyte; periphyton; fish; bacteria
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MDPI and ACS Style

Gentès, S.; Monperrus, M.; Legeay, A.; Gassie, C.; Maury-Brachet, R.; André, J.-M.; Guyoneaud, R. Influence of Macrophyte and Gut Microbiota on Mercury Contamination in Fish: A Microcosms Study. Appl. Sci. 2020, 10, 1500. https://doi.org/10.3390/app10041500

AMA Style

Gentès S, Monperrus M, Legeay A, Gassie C, Maury-Brachet R, André J-M, Guyoneaud R. Influence of Macrophyte and Gut Microbiota on Mercury Contamination in Fish: A Microcosms Study. Applied Sciences. 2020; 10(4):1500. https://doi.org/10.3390/app10041500

Chicago/Turabian Style

Gentès, Sophie, Mathilde Monperrus, Alexia Legeay, Claire Gassie, Régine Maury-Brachet, Jean-Marc André, and Rémy Guyoneaud. 2020. "Influence of Macrophyte and Gut Microbiota on Mercury Contamination in Fish: A Microcosms Study" Applied Sciences 10, no. 4: 1500. https://doi.org/10.3390/app10041500

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