Drought-induced discontinuities in the source and degradation of dissolved organic matter in a Mediterranean river

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 e...

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Autores: Casas-Ruiz, Joan Pere, Tittel, Jörg, Von Schiller, D., Catalán, Núria, Obrador, Biel, Gómez-Gener, Lluís, Zwirnmann, Elke, Sabater, Sergi, Marcé, Rafael
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2016
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/376910
Acceso en línea:http://hdl.handle.net/10261/376910
https://api.elsevier.com/content/abstract/scopus_id/84958614420
Access Level:acceso abierto
Palabra clave:Radiocarbon
Degradation
Dissolved organic matter
Drought
Mediterranean rivers
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spelling Drought-induced discontinuities in the source and degradation of dissolved organic matter in a Mediterranean riverCasas-Ruiz, Joan PereTittel, JörgVon Schiller, D.Catalán, NúriaObrador, BielGómez-Gener, LluísZwirnmann, ElkeSabater, SergiMarcé, RafaelRadiocarbonDegradationDissolved organic matterDroughtMediterranean riversThe 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.This research was funded by the Spanish Ministry of Economy and Competitiveness through the project CARBONET (CGL2011-30474-C02-01). J. P. Casas-Ruiz and Ll. Gómez-Gener were additionally supported by FPI predoctoral grants (BES-2012-059655 and BES-2012-059743), and D. von Schiller by a “Juan de la Cierva” postdoctoral grant (JCI-2010-06397). N. Catalán held a Wenner-Gren foundation stipend (Sweden). Authors also acknowledge the support from the Economy and Knowledge Department of the Catalan Government through Consolidated Research Group (2014 SGR 291)—Catalan Institute for Water Research. We thank Lorenzo Proia, Yvonne Rosenlöcher, Meritxell Abril, Susanne Halbedel, and Carmen Gutiérrez for lab and field assistance.Peer reviewedSpringerMinisterio de Economía y Competitividad (España)Wenner-Gren FoundationGeneralitat de CatalunyaInstitut de Recerca de l'AiguaCasas-Ruiz, Joan Pere [0000-0003-4708-9332]202520252016info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionapplication/pdfhttp://hdl.handle.net/10261/376910https://api.elsevier.com/content/abstract/scopus_id/84958614420reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/MICINN//JCI-2010-06397info:eu-repo/grantAgreement/MICINN//CGL2011-30474-C02-01info:eu-repo/grantAgreement/MINECO//BES-2012-059655info:eu-repo/grantAgreement/MINECO//BES-2012-059743https://doi.org/10.1007/s10533-015-0173-5Noinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3769102026-05-22T06:33:51Z
dc.title.none.fl_str_mv Drought-induced discontinuities in the source and degradation of dissolved organic matter in a Mediterranean river
title Drought-induced discontinuities in the source and degradation of dissolved organic matter in a Mediterranean river
spellingShingle Drought-induced discontinuities in the source and degradation of dissolved organic matter in a Mediterranean river
Casas-Ruiz, Joan Pere
Radiocarbon
Degradation
Dissolved organic matter
Drought
Mediterranean rivers
title_short Drought-induced discontinuities in the source and degradation of dissolved organic matter in a Mediterranean river
title_full Drought-induced discontinuities in the source and degradation of dissolved organic matter in a Mediterranean river
title_fullStr Drought-induced discontinuities in the source and degradation of dissolved organic matter in a Mediterranean river
title_full_unstemmed Drought-induced discontinuities in the source and degradation of dissolved organic matter in a Mediterranean river
title_sort Drought-induced discontinuities in the source and degradation of dissolved organic matter in a Mediterranean river
dc.creator.none.fl_str_mv Casas-Ruiz, Joan Pere
Tittel, Jörg
Von Schiller, D.
Catalán, Núria
Obrador, Biel
Gómez-Gener, Lluís
Zwirnmann, Elke
Sabater, Sergi
Marcé, Rafael
author Casas-Ruiz, Joan Pere
author_facet Casas-Ruiz, Joan Pere
Tittel, Jörg
Von Schiller, D.
Catalán, Núria
Obrador, Biel
Gómez-Gener, Lluís
Zwirnmann, Elke
Sabater, Sergi
Marcé, Rafael
author_role author
author2 Tittel, Jörg
Von Schiller, D.
Catalán, Núria
Obrador, Biel
Gómez-Gener, Lluís
Zwirnmann, Elke
Sabater, Sergi
Marcé, Rafael
author2_role author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Ministerio de Economía y Competitividad (España)
Wenner-Gren Foundation
Generalitat de Catalunya
Institut de Recerca de l'Aigua
Casas-Ruiz, Joan Pere [0000-0003-4708-9332]
dc.subject.none.fl_str_mv Radiocarbon
Degradation
Dissolved organic matter
Drought
Mediterranean rivers
topic Radiocarbon
Degradation
Dissolved organic matter
Drought
Mediterranean rivers
description 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.
publishDate 2016
dc.date.none.fl_str_mv 2016
2025
2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Postprint
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/376910
https://api.elsevier.com/content/abstract/scopus_id/84958614420
url http://hdl.handle.net/10261/376910
https://api.elsevier.com/content/abstract/scopus_id/84958614420
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
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#PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/MICINN//JCI-2010-06397
info:eu-repo/grantAgreement/MICINN//CGL2011-30474-C02-01
info:eu-repo/grantAgreement/MINECO//BES-2012-059655
info:eu-repo/grantAgreement/MINECO//BES-2012-059743
https://doi.org/10.1007/s10533-015-0173-5
No
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Springer
publisher.none.fl_str_mv Springer
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
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