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Guédron S, Audry S, Acha D, Bouchet S, Point D, Condom T, Heredia C, Campillo S, Baya PA, Groleau A, Amice E, Amouroux D. Diagenetic production, accumulation and sediment-water exchanges of methylmercury in contrasted sediment facies of Lake Titicaca (Bolivia). Sci Total Environ 2020; 723:138088. [PMID: 32392692 DOI: 10.1016/j.scitotenv.2020.138088] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Revised: 03/18/2020] [Accepted: 03/19/2020] [Indexed: 06/11/2023]
Abstract
Monomethylmercury (MMHg) concentrations in aquatic biota from Lake Titicaca are elevated although the mercury (Hg) contamination level of the lake is low. The contribution of sediments to the lake MMHg pool remained however unclear. In this work, seven cores representative of the contrasted sediments and aquatic ecotopes of Lake Titicaca were sliced and analyzed for Hg and redox-sensitive elements (Mn, Fe, N and S) speciation in pore-water (PW) and sediment to document early diagenetic processes responsible for MMHg production and accumulation in PW during organic matter (OM) oxidation. The highest MMHg concentrations (up to 12.2 ng L-1 and 90% of THg) were found in subsurface PWs of the carbonate-rich sediments which cover 75% of the small basin and 20% of the large one. In other sediment facies, the larger content of OM restricted MMHg production and accumulation in PW by sequestering Hg in the solid phase and potentially also by decreasing its bioavailability in the PW. Diagenetically reduced S and Fe played a dual role either favoring or restricting the availability of Hg for biomethylation. The calculation of theoretical diffusive fluxes suggests that Lake Titicaca bottom sediments are a net source of MMHg, accounting for more than one third of the daily MMHg accumulated in the water column of the Lago Menor. We suggest that in the context of rising anthropogenic pressure, the enhancement of eutrophication in high altitude Altiplano lakes may increase these MMHg effluxes into the water column and favor its accumulation in water and biota.
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Affiliation(s)
- S Guédron
- Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre, 38000 Grenoble, France; Laboratorio de Hidroquímica, Instituto de Investigaciones Químicas, Universidad Mayor de San Andres, Campus Universitario de Cota Cota, casilla 3161, La Paz, Bolivia.
| | - S Audry
- Géosciences Environnement Toulouse, UMR5563, IRD UR 154, Université Paul Sabatier, 14 Avenue Edouard Belin, 31400 Toulouse, France
| | - D Acha
- Unidad de Calidad Ambiental (UCA), Instituto de Ecología, Universidad Mayor de San Andrés, Campus Universitario de Cota Cota, casilla 3161, La Paz, Bolivia
| | - S Bouchet
- Universite 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, Pau, France
| | - D Point
- Géosciences Environnement Toulouse, UMR5563, IRD UR 154, Université Paul Sabatier, 14 Avenue Edouard Belin, 31400 Toulouse, France
| | - T Condom
- Univ. Grenoble Alpes, CNRS, IRD, Grenoble INP, Institut des Géosciences de l'Environnement (IGE), UMR 5001, F-38000 Grenoble, France
| | - C Heredia
- Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre, 38000 Grenoble, France; Unidad de Calidad Ambiental (UCA), Instituto de Ecología, Universidad Mayor de San Andrés, Campus Universitario de Cota Cota, casilla 3161, La Paz, Bolivia
| | - S Campillo
- Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre, 38000 Grenoble, France
| | - P A Baya
- Géosciences Environnement Toulouse, UMR5563, IRD UR 154, Université Paul Sabatier, 14 Avenue Edouard Belin, 31400 Toulouse, France
| | - A Groleau
- Institut de Physique du Globe de Paris (IPGP), 1, rue Jussieu, 75238 Paris Cedex 05, France
| | - E Amice
- LEMAR- Laboratoire des sciences de l'environnement marin, Institut Universitaire Européen de la Mer - Technopôle Brest-Iroise, Rue Dumont d'Urville, 29280 Plouzané, France
| | - D Amouroux
- Unidad de Calidad Ambiental (UCA), Instituto de Ecología, Universidad Mayor de San Andrés, Campus Universitario de Cota Cota, casilla 3161, La Paz, Bolivia; Universite 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, Pau, France
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Escoffier N, Bensoussan N, Vilmin L, Flipo N, Rocher V, David A, Métivier F, Groleau A. Estimating ecosystem metabolism from continuous multi-sensor measurements in the Seine River. Environ Sci Pollut Res Int 2018; 25:23451-23467. [PMID: 27335018 DOI: 10.1007/s11356-016-7096-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2016] [Accepted: 06/13/2016] [Indexed: 06/06/2023]
Abstract
Large rivers are important components of the global C cycle. While they are facing an overall degradation of their water quality, little remains known about the dynamics of their metabolism. In the present study, we used continuous multi-sensors measurements to assess the temporal variability of gross primary production (GPP) and ecosystem respiration (ER) rates of the anthropized Seine River over an annual cycle. Downstream from the Paris urban area, the Seine River is net heterotrophic at the annual scale (-226 gO2 m-2 year-1 or -264 gC m-2 year-1). Yet, it displays a net autotrophy at the daily and seasonal scales during phytoplankton blooms occurring from late winter to early summer. Multivariate analyses were performed to identify the drivers of river metabolism. Daily GPP is best predicted by chlorophyll a (Chla), water temperature (T), light, and rainfalls, and the coupling of daily GPP and Chla allows for the estimation of the productivity rates of the different phytoplankton communities. ER rates are mainly controlled by T and, to a lesser extent, by Chla. The increase of combined sewer overflows related to storm events during the second half of the year stimulates ER and the net heterotrophy of the river. River metabolism is, thus, controlled at different timescales by factors that are affected by human pressures. Continuous monitoring of river metabolism must, therefore, be pursued to deepen our understanding about the responses of ecosystem processes to changing human pressures and climate.
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Affiliation(s)
- N Escoffier
- Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, UMR 7154 CNRS, 75005, Paris, France.
- Nke Instrumentation, Z.I. de Kérandré, rue Gutenberg, 56700, Hennebont, France.
- Stream Biofilm and Ecosystem Research Laboratory, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 2, CH-1015, Lausanne, Switzerland.
| | - N Bensoussan
- IPSO-FACTO, SCOP arl, Pôle Océanologie et Limnologie, 10, rue Guy Fabre, 13001, Marseille, France
| | - L Vilmin
- Mines ParisTech, PSL Research University, Centre de Géosciences, 35, rue Saint-Honoré, 77305, Fontainebleau, France
- Department of Earth Sciences-Geochemistry, Faculty of Geosciences, Utrecht University, Utrecht, The Netherlands
| | - N Flipo
- Mines ParisTech, PSL Research University, Centre de Géosciences, 35, rue Saint-Honoré, 77305, Fontainebleau, France
| | - V Rocher
- Syndicat Interdépartemental pour l'Assainissement de l'Agglomération Parisienne, Direction du Développement et de la Prospective, 82 avenue Kléber, 92700, Colombes, France
| | - A David
- Nke Instrumentation, Z.I. de Kérandré, rue Gutenberg, 56700, Hennebont, France
| | - F Métivier
- Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, UMR 7154 CNRS, 75005, Paris, France
| | - A Groleau
- Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, UMR 7154 CNRS, 75005, Paris, France
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Guédron S, Point D, Acha D, Bouchet S, Baya PA, Tessier E, Monperrus M, Molina CI, Groleau A, Chauvaud L, Thebault J, Amice E, Alanoca L, Duwig C, Uzu G, Lazzaro X, Bertrand A, Bertrand S, Barbraud C, Delord K, Gibon FM, Ibanez C, Flores M, Fernandez Saavedra P, Ezpinoza ME, Heredia C, Rocha F, Zepita C, Amouroux D. Mercury contamination level and speciation inventory in Lakes Titicaca & Uru-Uru (Bolivia): Current status and future trends. Environ Pollut 2017; 231:262-270. [PMID: 28806691 DOI: 10.1016/j.envpol.2017.08.009] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2017] [Revised: 07/27/2017] [Accepted: 08/02/2017] [Indexed: 06/07/2023]
Abstract
Aquatic ecosystems of the Bolivian Altiplano (∼3800 m a.s.l.) are characterized by extreme hydro-climatic constrains (e.g., high UV-radiations and low oxygen) and are under the pressure of increasing anthropogenic activities, unregulated mining, agricultural and urban development. We report here a complete inventory of mercury (Hg) levels and speciation in the water column, atmosphere, sediment and key sentinel organisms (i.e., plankton, fish and birds) of two endorheic Lakes of the same watershed differing with respect to their size, eutrophication and contamination levels. Total Hg (THg) and monomethylmercury (MMHg) concentrations in filtered water and sediment of Lake Titicaca are in the lowest range of reported levels in other large lakes worldwide. Downstream, Hg levels are 3-10 times higher in the shallow eutrophic Lake Uru-Uru than in Lake Titicaca due to high Hg inputs from the surrounding mining region. High percentages of MMHg were found in the filtered and unfiltered water rising up from <1 to ∼50% THg from the oligo/hetero-trophic Lake Titicaca to the eutrophic Lake Uru-Uru. Such high %MMHg is explained by a high in situ MMHg production in relation to the sulfate rich substrate, the low oxygen levels of the water column, and the stabilization of MMHg due to abundant ligands present in these alkaline waters. Differences in MMHg concentrations in water and sediments compartments between Lake Titicaca and Uru-Uru were found to mirror the offset in MMHg levels that also exist in their respective food webs. This suggests that in situ MMHg baseline production is likely the main factor controlling MMHg levels in fish species consumed by the local population. Finally, the increase of anthropogenic pressure in Lake Titicaca may probably enhance eutrophication processes which favor MMHg production and thus accumulation in water and biota.
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Affiliation(s)
- S Guédron
- Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre, 38000 Grenoble, France; Laboratorio de Hidroquímica, Instituto de Investigaciones Químicas, Universidad Mayor de San Andrés, Campus Universitario de Cota-Cota, Casilla 3161, La Paz, Bolivia.
| | - D Point
- Géosciences Environnement Toulouse, UMR5563 - IRD UR 234, Université Paul Sabatier, 14 Avenue Edouard Belin 31400 Toulouse, France; Unidad de Calidad Ambiental (UCA), Instituto de Ecología, Universidad Mayor de San Andrés, Campus Universitario de Cota Cota, Casilla 3161, La Paz, Bolivia.
| | - D Acha
- Unidad de Calidad Ambiental (UCA), Instituto de Ecología, Universidad Mayor de San Andrés, Campus Universitario de Cota Cota, Casilla 3161, La Paz, Bolivia.
| | - S Bouchet
- CNRS, Univ. Pau & Pays Adour, Institut des sciences analytiques et de Physico-chimie pour l'Environnement et les Matériaux, MIRA, UMR5254, 64000 PAU, France
| | - P A Baya
- Géosciences Environnement Toulouse, UMR5563 - IRD UR 234, Université Paul Sabatier, 14 Avenue Edouard Belin 31400 Toulouse, France
| | - E Tessier
- CNRS, Univ. Pau & Pays Adour, Institut des sciences analytiques et de Physico-chimie pour l'Environnement et les Matériaux, MIRA, UMR5254, 64000 PAU, France
| | - M Monperrus
- CNRS, Univ. Pau & Pays Adour, Institut des sciences analytiques et de Physico-chimie pour l'Environnement et les Matériaux, MIRA, UMR5254, 64000 PAU, France
| | - C I Molina
- Unidad de Calidad Ambiental (UCA), Instituto de Ecología, Universidad Mayor de San Andrés, Campus Universitario de Cota Cota, Casilla 3161, La Paz, Bolivia
| | - A Groleau
- Institut de Physique du Globe de Paris (IPGP), 1, rue Jussieu, 75238 Paris Cedex 05, France
| | - L Chauvaud
- Laboratoire des Sciences de l'Environnement Marin (LEMAR), UMR 6539, IUEM Technopôle Brest-Iroise, rue Dumont d'Urville, 29280 Plouzané, France
| | - J Thebault
- Laboratoire des Sciences de l'Environnement Marin (LEMAR), UMR 6539, IUEM Technopôle Brest-Iroise, rue Dumont d'Urville, 29280 Plouzané, France
| | - E Amice
- Laboratoire des Sciences de l'Environnement Marin (LEMAR), UMR 6539, IUEM Technopôle Brest-Iroise, rue Dumont d'Urville, 29280 Plouzané, France
| | - L Alanoca
- Laboratorio de Hidroquímica, Instituto de Investigaciones Químicas, Universidad Mayor de San Andrés, Campus Universitario de Cota-Cota, Casilla 3161, La Paz, Bolivia
| | - C Duwig
- Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, IFSTTAR, IGE, 38000 Grenoble, France
| | - G Uzu
- Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, IFSTTAR, IGE, 38000 Grenoble, France
| | - X Lazzaro
- Unidad de Calidad Ambiental (UCA), Instituto de Ecología, Universidad Mayor de San Andrés, Campus Universitario de Cota Cota, Casilla 3161, La Paz, Bolivia; Biologie des Organismes et Ecosystèmes Aquatiques (BOREA), Institut de Recherche pour le Développement (IRD), UMR 7208, Paris, France
| | - A Bertrand
- MARine Biodiversity, Exploitation and Conservation (MARBEC), Institut de Recherche pour le Développement (IRD), Univ. Montpellier, Place Eugène Bataillon, bât 24, CC093 34 095 Montpellier Cedex 5, France
| | - S Bertrand
- MARine Biodiversity, Exploitation and Conservation (MARBEC), Institut de Recherche pour le Développement (IRD), Univ. Montpellier, Place Eugène Bataillon, bât 24, CC093 34 095 Montpellier Cedex 5, France
| | - C Barbraud
- Laboratoire du Centre d'Etudes Biologiques de Chizé (CEBC), UMR 7372, CNRS, Université de La Rochelle 405 Route de La Canauderie, 79360 Villiers-en-Bois, France
| | - K Delord
- Laboratoire du Centre d'Etudes Biologiques de Chizé (CEBC), UMR 7372, CNRS, Université de La Rochelle 405 Route de La Canauderie, 79360 Villiers-en-Bois, France
| | - F M Gibon
- Biologie des Organismes et Ecosystèmes Aquatiques (BOREA), Institut de Recherche pour le Développement (IRD), UMR 7208, Paris, France
| | - C Ibanez
- UPA, Universidad Pública de El Alto, Ecología y Recursos Naturales, El Alto, Bolivia
| | - M Flores
- Laboratorio de Hidroquímica, Instituto de Investigaciones Químicas, Universidad Mayor de San Andrés, Campus Universitario de Cota-Cota, Casilla 3161, La Paz, Bolivia; Unidad de Calidad Ambiental (UCA), Instituto de Ecología, Universidad Mayor de San Andrés, Campus Universitario de Cota Cota, Casilla 3161, La Paz, Bolivia
| | - P Fernandez Saavedra
- Unidad de Calidad Ambiental (UCA), Instituto de Ecología, Universidad Mayor de San Andrés, Campus Universitario de Cota Cota, Casilla 3161, La Paz, Bolivia
| | - M E Ezpinoza
- Unidad de Calidad Ambiental (UCA), Instituto de Ecología, Universidad Mayor de San Andrés, Campus Universitario de Cota Cota, Casilla 3161, La Paz, Bolivia
| | - C Heredia
- Unidad de Calidad Ambiental (UCA), Instituto de Ecología, Universidad Mayor de San Andrés, Campus Universitario de Cota Cota, Casilla 3161, La Paz, Bolivia
| | - F Rocha
- Unidad de Calidad Ambiental (UCA), Instituto de Ecología, Universidad Mayor de San Andrés, Campus Universitario de Cota Cota, Casilla 3161, La Paz, Bolivia
| | - C Zepita
- Unidad de Calidad Ambiental (UCA), Instituto de Ecología, Universidad Mayor de San Andrés, Campus Universitario de Cota Cota, Casilla 3161, La Paz, Bolivia
| | - D Amouroux
- Unidad de Calidad Ambiental (UCA), Instituto de Ecología, Universidad Mayor de San Andrés, Campus Universitario de Cota Cota, Casilla 3161, La Paz, Bolivia; CNRS, Univ. Pau & Pays Adour, Institut des sciences analytiques et de Physico-chimie pour l'Environnement et les Matériaux, MIRA, UMR5254, 64000 PAU, France.
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