Título:
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Hydrological conditions control in situ DOM retention and release along a Mediterranean river
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Autor/a:
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Butturini, Andrea; Guarch, A.; Romaní i Cornet, Anna M.; Freixa Casals, Anna; Amalfitano, Stefano; Fazi, Stefano; Ejarque i Gonzàlez, Elisabet
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Otros autores:
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Ministerio de Ciencia e Innovación (Espanya) |
Abstract:
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Uncertainties exist regarding the magnitude of in situ dissolved organic matter (DOM) processing in lotic systems. In addition, little is known about the effects of extreme hydrological events on in-stream DOM retention or release during downriver transport. This study quantified the net in-stream retention/release efficiencies (η) of dissolved organic carbon (DOC) and its humic and protein-like fluorescent fractions along a Mediterranean river during drought, baseflow and flood conditions. High performance size exclusion chromatography was used to describe the apparent size distributions of the humic and protein-like DOM moieties. A snapshot mass balance allowed estimating the η values of DOC and humic and protein-like fractions. Significant DOM net retention (η < 0) was detected during the drought condition and the protein-like fraction was more retained than the humic-like fraction and bulk DOC. In addition, small substances were more efficiently retained than larger substances. DOC retention decreased under baseflow conditions, but it remained significant. The humic and protein-like net efficiencies exhibited high variability, but the net retention were not significant. From a longitudinal perspective, the entire fluvial corridor contributed net retention of DOC and humic and protein-like moieties net retention during drought condition. In contrast, net retention/release efficiencies exhibited spatial variability during baseflow condition. The flood preferentially mobilized large size DOM molecules and the fluvial corridor behaved as a homogeneous passive DOM (η = 0) conduit. This research highlights the relevance of hydrological extreme events on the magnitude of DOM retention/release mass balance and emphasizes the need to perform measurements during these conditions to quantify the impact of fluvial corridors on DOM fate and transport |
Abstract:
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This research is funded by the Spanish Ministry of Education and Science (MEC) (CGL2011-30151-C02 and CGL2014-5876-C3-R) and European Community 7th Framework Programme (No. 603629- ENV-2013-6.2.1-Globaqua) |
Materia(s):
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-Ecologia microbiana -Microbial ecology -Microorganismes -Microorganisms |
Derechos:
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Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
Tipo de documento:
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Artículo Artículo - Versión publicada |
Editor:
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Elsevier
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