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https://doi.org/10.1016/j.watres.2022.118727
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Título: | Origin, accumulation and fate of dissolved organic matter in an extreme hypersaline shallow lake |
Fecha de publicación: | 2022 |
Editorial: | Elsevier |
Cita bibliográfica: | Water Research, 221, 118727, 2021 |
ISSN: | 0043-1354 |
Materias relacionadas: | CDU::5 - Ciencias puras y naturales |
Palabras clave: | Dissolved organic matter Hypersaline waters Endorheic Spectroscopy FT-ICR-MS |
Resumen: | Hypersaline endorheic aquatic systems (H-SEAS) are lakes/shallow playas in arid and semiarid regions that undergo extreme oscillations in salinity and severe drought episodes. Although their geochemical uniqueness and microbiome have been deeply studied, very little is known about the availability and quality of dissolved organic matter (DOM) in the water column.. A H-SEAS from the Monegros Desert (Zaragoza, NE Spain) was studied during a hydrological wetting-drying-rewetting cycle. DOM analysis included: (i) a dissolved organic carbon (DOC) mass balance; (ii) spectroscopy (absorbance and fluorescence) and (iii) a molecular characterization with Fourier-transform ion cyclotron resonance mass spectrometry (FT-ICR-MS). The studied system stored a large amount of DOC and under the highest salinity conditions, salt-saturated waters (i.e., brines with salinity > 30%) accumulated a disproportionate quantity of DOC, indicating a significant in-situ net DOM production. Simultaneously, during the hydrological transition from wet to dry, the DOM pool showed strong alterations of it molecular composition. Spectroscopic methods indicated that aromatic and degraded DOM was rapidly replaced by fresher, relatively small, microbial-derived moieties with a large C/N ratio. FT-ICR-MS highlighted the accumulation of small, saturated and oxidized molecules (molecular O/C > 0.5), with a remarkable increase in the relative contribution of highly oxygenated (molecular O/C>0.9) compounds and a decrease of aliphatic and carboxyl-rich alicyclic moleculesThese results indicated that H-SEAS are extremely active in accumulating and processing DOM, with the notable release of organic solutes probably originated from decaying microplankton under large osmotic stress at extremely high salinities. |
Autor/es principal/es: | Butturini, Andrea Herzsprung, Peter Lechtenfeld, O.J. Alcorlo, Paloma Benaiges-Fernandez, Robert Berlanga, Mercedes Boadella, Judit Freixinos Campillo, Zeus Gómez, Rosa Sánchez-Montoya, María del Mar Urmeneta, Jordi Romaní, Anna |
Facultad/Departamentos/Servicios: | Biología |
URI: | http://hdl.handle.net/10201/138372 |
DOI: | https://doi.org/10.1016/j.watres.2022.118727 |
Tipo de documento: | info:eu-repo/semantics/article |
Número páginas / Extensión: | 14 |
Derechos: | info:eu-repo/semantics/embargoedAccess |
Descripción: | ©<2022>. This document is the Published version of a Published Work that appeared in final form in [Water Research]. To access the final edited and published work see [https://doi.org/10.1016/j.watres.2022.118727] |
Aparece en las colecciones: | Artículos: Ecología e Hidrología |
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