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Multi-proxy evidence of rainfall variability recorded in subaqueous deltaic deposits off the Adra River, southeast Iberian Peninsula

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dc.contributor.authorMendes, Isabel
dc.contributor.authorLobo, F. J.
dc.contributor.authorFernández-Salas, L. M.
dc.contributor.authorLópez-González, N.
dc.contributor.authorBárcenas, P.
dc.contributor.authorSchönfeld, J.
dc.contributor.authorFerreira, Óscar
dc.date.accessioned2017-11-17T12:09:56Z
dc.date.available2017-11-17T12:09:56Z
dc.date.issued2015
dc.description.abstractThe Adra River deltaic system, southeast Iberian Peninsula, shows a steep topography and is subjected to strong climatic seasonality. This system has been affected by alternating wet and dry periods, and it has also undergone numerous anthropogenic activities such as deforestation, mining activities, river channel deviations and dam construction, particularly during the last two centuries. Two sediment cores were retrieved off the Adra River, from the western (MS_V9) and eastern (MS_V4) lobes of the subaqueous deltaic deposit. A multi-proxy study was carried out, including grain size, benthic foraminiferal assemblages, magnetic susceptibility and geochemical element analyses, in order to understand the sedimentary expression of recent climatic cycles and anthropogenic interventions in the river basin. Periods of increased deposition of coarse-grained sediments, low absolute abundance of benthic foraminifera and high elemental ratios indicative of terrigenous contributions, were interpreted as periods of increased sediment supply to the shelf. Four flooding events were recorded in core MS_V9 and three events on core MS_V4, of which two were observed in both cores. They were related to periods with major floods that were documented on the southern Iberian Peninsula around 1770e1810 and 1860 e1870 AD. On the other hand, sediment core intervals exhibiting increasing proportion of fine-grained sediments and higher abundances of foraminiferal species assigned as successful colonizers (Textularia earlandi) and opportunistic species that feed on bacteria or terrestrial organic matter (Bolivina ordinaria, Bulimina elongata, Eggerelloides scaber and Ammonia beccarii or tepida), indicate the establishment of new environments with new ecological constraints. They were related to significant decreases of terrigenous sediment input during low rainfall or dry periods. The increase of opportunistic species feeding on fresh phytodetritus (Nonionella iridea, Nonionella stella, Nonionella sp., Brizalina dilatata, Epistominella vitrea and Bolivinellina pseudopuntata), under more stable environmental conditions, also point to a stronger marine influence on the prodeltaic environments during these periods. The human interventions on the river basin after 1872 AD, with the deviation of the main river channel to the east, led to a drastic reduction of the sediment exported to the western delta lobe. This study showed that the sedimentation on the Adra subaqueous deltaic deposit was mainly controlled by rainfall variability from 1663 to 1872 AD, and afterwards by anthropogenic interventions.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationMendes, I., Lobo, F.J., Fernández-Salas, L.M, López-González, N., Bárcenas, P., Schönfeld, J., Ferreira, Ó., 2015. Multi-proxy evidence of rainfall variability recorded in subaqueous deltaic deposits off the Adra River, southeast Iberian Peninsula. Estuarine, Coastal and Shelf Science, 167, 300-312.pt_PT
dc.identifier.doi10.1016/j.ecss.2015.08.005pt_PT
dc.identifier.issn0272-7714
dc.identifier.otherAUT: OFE00989;
dc.identifier.urihttp://hdl.handle.net/10400.1/10187
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relation.publisherversionwww.elsevier.com/locate/ecsspt_PT
dc.subjectClimatic variabilitypt_PT
dc.subjectBenthic foraminiferapt_PT
dc.subjectGeochemistrypt_PT
dc.subjectDeltaic environmentspt_PT
dc.subjectHuman impactpt_PT
dc.subjectNorthern Alboran Seapt_PT
dc.titleMulti-proxy evidence of rainfall variability recorded in subaqueous deltaic deposits off the Adra River, southeast Iberian Peninsulapt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBPD%2F72869%2F2010/PT
oaire.citation.endPage312pt_PT
oaire.citation.startPage300pt_PT
oaire.citation.titleEstuarine, Coastal and Shelf Sciencept_PT
oaire.citation.volume167pt_PT
oaire.fundingStreamSFRH
person.familyNameMendes
person.familyNameFerreira
person.givenNameIsabel Maria de Paiva Pinto
person.givenNameÓscar
person.identifier.ciencia-id5C15-242C-FDC0
person.identifier.ciencia-id1F1C-DF44-94C9
person.identifier.orcid0000-0001-7004-7910
person.identifier.orcid0000-0001-9975-0036
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsrestrictedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicationc34b90c6-5a34-472c-a658-1d2329a59936
relation.isAuthorOfPublication14adf536-4f81-42de-b00f-6d1cf3b0d75e
relation.isAuthorOfPublication.latestForDiscovery14adf536-4f81-42de-b00f-6d1cf3b0d75e
relation.isProjectOfPublication510b1b42-618a-42ca-91d0-3feb00a1967a
relation.isProjectOfPublication.latestForDiscovery510b1b42-618a-42ca-91d0-3feb00a1967a

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