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Characteristics of organic matter sources from Guadiana Estuary salt marsh sediments (SW Iberian Peninsula)

2020-06Journal article Restricted access
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dc.contributor.authorKumar, Mukesh
dc.contributor.authorBoski, Tomasz
dc.contributor.authorGonzalez-Vila, Francisco J.
dc.contributor.authorJimenez-Morillo, Nicasio T.
dc.contributor.authorGonzalez-Perez, Jose A.
dc.date.accessioned2021-06-24T11:35:33Z
dc.date.available2021-06-24T11:35:33Z
dc.date.issued2020-06
dc.description.abstractEstuaries are dynamic interfaces between land, rivers and the ocean that play major roles in the global carbon cycle. These coastal wetlands store huge amounts of organic carbon (OC), commonly known as "blue carbon" and excellent places to study C cycling. The Guadiana river estuary is among the most important tidal salt marshes in the South - Iberian coastal margin. Here, a detailed organic geochemical study is described that includes the identification of sedimentary OM composition at a molecular and isotopic level. Total organic carbon content (TOC) of core sediments ranged from 0.39 to 2.23% and stable carbon isotope composition (delta C-13) also showed a wide range between -22.4 and -27.0 parts per thousand. A(13)C depletion trend observed from the surface to bottom in the core sediments profiles, reflects loss of labile biogenic C-13 enriched compounds i.e. polysaccharides and a selective preservation of more depleted compounds with depth i.e. lignin and lipids in the core sediments. Series of nalkanes were found in the range from C-10 to C-31. Carbon preference index ratio (CPI) calculated for long-chain n-alkanes (C-24-C-31) that ranged between 1.17 and 1.94 reflecting diverse OM inputs to the sediments. A study of the lignin-derived phenolic composition pointed to a recalcitrant OM derived from both gymnosperm and angiosperm plants. Moreover, high abundance of vinyl phenol and vinyl guaiacol points to a dominant contribution of lignins from grasses and aquatic macrophytes to the sediments. A well-resolved series of long-chain linear alkyl benzenes (LABs from C-4 to C-22) were recorded in all core sediment samples indicating direct discharge of untreated domestic and/or industrial effluents to the estuary. Polycyclic aromatic hydrocarbons (PAHs) with more than 3 rings reflects the pyrogenic origin of a portion of the sedimentary OM. This study highlights the importance of different OM sources to the lower Guadiana estuarine sediments and contributes to a better knowledge about its origin, dynamics and fate.
dc.description.sponsorshipEU Erasmus Mundus Joint Doctorate fellowship
dc.description.sponsorshipEUEuropean Commission [FP7-ENV-2011, 282845, FP7-534 ENV-2012, 308392]
dc.description.sponsorshipMINECO project INTERCARBON [CGL 2016-78937-R]
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.1016/j.csr.2020.104076
dc.identifier.issn0278-4343
dc.identifier.urihttp://hdl.handle.net/10400.1/16474
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.relationCOmmunity-based Management of EnvironmenTal challenges in Latin America
dc.relationDEVelopment Of innovative Tools for understanding marine biodiversity and assessing good Environmental Status
dc.subjectAnalytical pyrolysis
dc.subjectLABs
dc.subjectLignin
dc.subjectMolecular biomarkers
dc.subjectPAHs
dc.subjectSalt marshes
dc.subjectStable isotopes
dc.subject.otherOceanography
dc.titleCharacteristics of organic matter sources from Guadiana Estuary salt marsh sediments (SW Iberian Peninsula)
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleCOmmunity-based Management of EnvironmenTal challenges in Latin America
oaire.awardTitleDEVelopment Of innovative Tools for understanding marine biodiversity and assessing good Environmental Status
oaire.awardURIinfo:eu-repo/grantAgreement/EC/FP7/282845/EU
oaire.awardURIinfo:eu-repo/grantAgreement/EC/FP7/308392/EU
oaire.citation.startPage104076
oaire.citation.titleContinental Shelf Research
oaire.citation.volume197
oaire.fundingStreamFP7
oaire.fundingStreamFP7
person.familyNameBoski
person.givenNameTomasz
person.identifier.ciencia-id1416-B317-51D1
person.identifier.orcid0000-0003-2462-4179
person.identifier.scopus-author-id6602267486
project.funder.identifierhttp://doi.org/10.13039/501100008530
project.funder.identifierhttp://doi.org/10.13039/501100008530
project.funder.nameEuropean Commission
project.funder.nameEuropean Commission
rcaap.rightsrestrictedAccess
rcaap.typearticle
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relation.isAuthorOfPublication.latestForDiscoverya857b0c7-90ab-473b-a62e-e92b452e604d
relation.isProjectOfPublication3197fb1a-8f03-44bc-8312-ac820b7579ba
relation.isProjectOfPublicationd4aba6a0-5743-4148-9cad-d2a9fb72bc4f
relation.isProjectOfPublication.latestForDiscovery3197fb1a-8f03-44bc-8312-ac820b7579ba

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