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|dc.contributor.author||Bravo, Andrea G.||-|
|dc.contributor.author||Gascón Díez, E.||-|
|dc.identifier.citation||1st Meeting of the Iberian Ecological Society (SIBECOL) & XIV AEET Meeting : Abstract book: 322 (2019)||-|
|dc.description||1st Meeting of the Iberian Ecological Society (SIBECOL) & XIV Asociación Española de Ecología Terrestre (AEET) Meeting, Ecology: an integrative science in the Anthropocene, 4-7 February 2019, Barcelona, Spain.-- 1 page||-|
|dc.description.abstract||The formation of methylmercury (MeHg) is carried out by specific groups of anaerobic bacteria as iron-reducing bacteria, sulphate-reducing bacteria, methanogens, Firmicutes and Methanomicrobia. The finding of Hg(II) methylation processes in oxic water columnof marine ecosystems was a breakthrough in the conceptual model of Hg biogeochemical cycling. By combining field and laboratorybased experiments, we evaluated the role of sinking particles on Hg(II) methylation in the oxic water column of the largest Lake inWestern Europe (Lake Geneva). Differences in THg concentrations between sediments and sinking particles were not statisticallysignificant (p > 0.05). In contrast, MeHg concentrations were up to ten-fold greater in sinking particles than in sediments. Hg(II)methylation rates were one order of magnitude greater in sinking particles. Furthermore, the amendement of molybdate (an inhibitorof sulphate-reducing bacteria) to sinking particles significantly decreased Hg methylation (~80 % inhibition). In this study we demon-strate that MeHg is biologically formed in sinking particles of oxic water column of lake systems and we highlight that sulfate re-duction is an important metabolic pathway involved in the process. We conclude that MeHg formed in water column has beenunderestimated but might represent a significant pool of MeHg for aquatic food webs||-|
|dc.publisher||Asociación Española de Ecología Terrestre||-|
|dc.title||Anaerobic mercury methylation in the oxic water column of freshwater systems||-|
|dc.type||comunicación de congreso||-|
|Appears in Collections:||(ICM) Comunicaciones congresos|
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