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Drought-induced dis...
Drought-induced discontinuities in the source and degradation of dissolved organic matter in a Mediterranean river
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- Casas-Ruiz, Joan P. (författare)
- Catalan Inst Water Res ICRA, Emili Grahit 101, Girona 17003, Spain.
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- Tittel, Joerg (författare)
- UFZ Helmholtz Ctr Environm Res, Dept Lake Res, Bruckstr 3a, D-39114 Magdeburg, Germany.
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- von Schiller, Daniel (författare)
- Univ Basque Country, Fac Sci & Technol, Dept Plant Biol & Ecol, Apdo 644, Bilbao 48080, Spain.
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- Catalan, Nuria (författare)
- Uppsala universitet,Limnologi
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- Obrador, Biel (författare)
- Univ Barcelona, Dept Ecol, Av Diagonal 643, E-08028 Barcelona, Spain.
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- Gomez-Gener, Lluis (författare)
- Univ Barcelona, Dept Ecol, Av Diagonal 643, E-08028 Barcelona, Spain.
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- Zwirnmann, Elke (författare)
- Leibniz Inst Freshwater Ecol & Inland Fisheries, Muggelseedamm 301, D-12587 Berlin, Germany.
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- Sabater, Sergi (författare)
- Catalan Inst Water Res ICRA, Emili Grahit 101, Girona 17003, Spain.;Univ Girona, Inst Aquat Ecol, Girona 17071, Spain.
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- Marce, Rafael (författare)
- Catalan Inst Water Res ICRA, Emili Grahit 101, Girona 17003, Spain.
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Catalan Inst Water Res ICRA, Emili Grahit 101, Girona 17003, Spain UFZ Helmholtz Ctr Environm Res, Dept Lake Res, Bruckstr 3a, D-39114 Magdeburg, Germany. (creator_code:org_t)
- 2015-12-23
- 2016
- Engelska.
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Ingår i: Biogeochemistry. - : Springer Science and Business Media LLC. - 0168-2563 .- 1573-515X. ; 127:1, s. 125-139
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The composition of dissolved organic matter (DOM) in rivers results from the different sources and in-stream transformations along the land to ocean aquatic continuum. Riverine DOM sources are highly dependent on the hydrological connection between the river channel and the surrounding terrestrial ecosystems, but how the lack of this connectivity (e.g., during drought episodes) affects the sources and biodegradation of DOM in rivers remains unclear. Here we identified the DOM sources as well as the different DOM pools that are respired along a Mediterranean river during drought by combining absorbance-fluorescence spectroscopy, size-exclusion chromatography, biodegradation assays, and stable and radiocarbon isotopes. DOM composition was highly heterogeneous along the river in response to different sources and in-stream processes in each distinct aquatic environment (i.e., isolated water pools, running waters, and impounded waters in weirs). The reduced hydrological connectivity with terrestrial ecosystems promoted the influence of autochthonous DOM sources. Still, tree leaves from overhanging canopies stood out as an important terrestrial DOM source, especially in sites where water residence time was high such as isolated pools and weirs. Degradation of leaf leachates was a relevant process in these sites, whereas autochthonous DOM and groundwater millennial DOM (> 1300 year B.P.) seemed to be degraded in running waters. Overall, our results highlight that the drought-induced hydrological disconnection entails a great spatial heterogeneity in the sources of DOM, which at the same time determines the different DOM pools that are respired in each environment along the river.
Ämnesord
- NATURVETENSKAP -- Biologi -- Ekologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Ecology (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Oceanografi, hydrologi och vattenresurser (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Oceanography, Hydrology and Water Resources (hsv//eng)
Nyckelord
- Mediterranean rivers
- Drought
- Dissolved organic matter
- Degradation
- Radiocarbon
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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