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Biomarkers as indicators of sedimentary organic matter sources and early diagenetic transformation of pentacyclic triterpenoids in a tropical mangrove ecosystem

2019-11Journal article Restricted
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dc.contributor.authorKumar, Mukesh
dc.contributor.authorBoski, T.
dc.contributor.authorLima-Filho, Francisco P.
dc.contributor.authorBezerra, Francisco H. R.
dc.contributor.authorGonzalez-Vila, Francisco J.
dc.contributor.authorAlam Bhuiyan, Md Khurshid
dc.contributor.authorGonzalez-Perez, Jose A.
dc.date.accessioned2020-07-24T10:50:53Z
dc.date.available2020-07-24T10:50:53Z
dc.date.issued2019-11
dc.description.abstractMangrove vegetation covers extensive areas along Brazilian tropical coasts and accumulates large amounts of organic carbon in the intertidal sediments. We have investigated the molecular biomarker composition of mangrove sediments from the Potengi estuary North-East Brazil. To characterise sources and fate of sedimentary organic matter (OM), a direct analytical pyrolysis approach was used. The sediment pyrolysates yielded homologous series of aliphatic compounds (n-alkane/n-alkene doublets, n-alkanoic acid and n-alkan-2-ones), triterpenoids and lignin-derived methoxphenols, indicating that most of the sedimentary OM input originates from terrestrial vascular plants. High abundance of long-chain n-alk-1-ene series with an even carbon number predominance peaking at C-28:1-most likely originated from local mangrove vegetation-is found co-eluted with the saturated odd carbon n-alkane series. The occurrence of lignin and n-alkan-2-one biomarkers in the sediments has provided parallel information about the input from vascular plants dominating the intertidal zone. This was further corroborated by the presence of the triterpenols (beta-amyrin, and germanicol), that provided chemotaxonomic information on mangrove derived leaf wax in sedimentary OM. The unsaturated triterpenoid including teraxerol acetate, olean-12-ene, olean-18-ene, oleana-11, 13(18)-diene, a-neoursa-3(5), 12-diene and aneooleana-3(5), 12-diene, were also observed in sediment pyrolysates. The presence of these unsaturated pentacyclic triterpenoids revealed an early diagenetic alteration of terrestrial OM in the sediments. This study has demonstrated that routine application of analytical pyrolysis may provide important insight into the sources of sedimentary OM and its diagenetic fate in mangrove intertidal sediments.
dc.description.sponsorshipEU Erasmus Mundus Joint Doctorate fellowship
dc.description.sponsorshipEUEuropean Union (EU) [282845, 308392]
dc.description.sponsorshipMINECO project INTERCARBON [CGL2016-78937-R]
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.1016/j.ecss.2019.106403
dc.identifier.issn0272-7714
dc.identifier.urihttp://hdl.handle.net/10400.1/14167
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.relationDEVelopment Of innovative Tools for understanding marine biodiversity and assessing good Environmental Status
dc.relationCOmmunity-based Management of EnvironmenTal challenges in Latin America
dc.subjectCarbon isotopic composition
dc.subjectFatty acids
dc.subjectPyrolysis gas
dc.subjectHumic acids
dc.subjectN-Alkanes
dc.subjectMacrotidal estuary
dc.subjectLignin
dc.subjectSoil
dc.subjectLipids
dc.subjectGeochemistry
dc.titleBiomarkers as indicators of sedimentary organic matter sources and early diagenetic transformation of pentacyclic triterpenoids in a tropical mangrove ecosystem
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleDEVelopment Of innovative Tools for understanding marine biodiversity and assessing good Environmental Status
oaire.awardTitleCOmmunity-based Management of EnvironmenTal challenges in Latin America
oaire.awardURIinfo:eu-repo/grantAgreement/EC/FP7/308392/EU
oaire.awardURIinfo:eu-repo/grantAgreement/EC/FP7/282845/EU
oaire.citation.startPage106403
oaire.citation.titleEstuarine, Coastal and Shelf Science
oaire.citation.volume229
oaire.fundingStreamFP7
oaire.fundingStreamFP7
person.familyNameKumar
person.familyNameBoski
person.givenNameMukesh
person.givenNameTomasz
person.identifier.ciencia-id1416-B317-51D1
person.identifier.orcid0000-0002-1685-2385
person.identifier.orcid0000-0003-2462-4179
person.identifier.scopus-author-id57201314610
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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