RT Journal Article
T1 Origin, accumulation and fate of dissolved organic matter in an extreme hypersaline shallow lake
A1 Butturini, Andrea
A1 Herzsprung, Peter
A1 Lechtenfeld, Oliver
A1 Alcorlo, Paloma
A1 Benaiges-Fernández, Robert
A1 Berlanga, Mercedes
A1 Boadella, Jesús
A1 Freixinos Campillo, Zeus
A1 Gómez, Rosa
A1 Sánchez Montoya, María Del Mar
A1 Urmeneta, Jordi
A1 Romaní, Ana Maria
AB 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.
PB Elsevier
SN 0043-1354
YR 2022
FD 2022
LK https://hdl.handle.net/20.500.14352/101699
UL https://hdl.handle.net/20.500.14352/101699
LA eng
NO Butturini, A., et al. «Origin, Accumulation and Fate of Dissolved Organic Matter in an Extreme Hypersaline Shallow Lake». Water Research, vol. 221, agosto de 2022, p. 118727. https://doi.org/10.1016/j.watres.2022.118727.
NO Ministerio de Ciencia e Innovación (España)
NO European Commission
NO Helmholtz Association
DS Docta Complutense
RD 5 jun 2025