Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1016/j.watres.2022.118727
Lizenz creative commons licence
Titel (primär) Origin, accumulation and fate of dissolved organic matter in an extreme hypersaline shallow lake
Autor Butturini, A.; Herzsprung, P.; Lechtenfeld, O.J.; Alcorlo, P.; Benaiges-Fernandez, R.; Berlanga, M.; Boadella, J.; Freixinos Campillo, Z.; Gomez, R.M.; Sanchez-Montoya, M.M.; Urmeneta, J.; Romaní, A.M.
Journal / Serie Water Research
Erscheinungsjahr 2022
Department SEEFO; ANA
Band/Volume 221
Seite von art. 118727
Sprache englisch
Topic T5 Future Landscapes
T9 Healthy Planet
Keywords Dissolved organic matter; Hypersaline waters; endorheic; Spectroscopy; FT-ICR-MS
Abstract 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.
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Butturini, A., Herzsprung, P., Lechtenfeld, O.J., Alcorlo, P., Benaiges-Fernandez, R., Berlanga, M., Boadella, J., Freixinos Campillo, Z., Gomez, R.M., Sanchez-Montoya, M.M., Urmeneta, J., Romaní, A.M. (2022):
Origin, accumulation and fate of dissolved organic matter in an extreme hypersaline shallow lake
Water Res. 221 , art. 118727