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Benthic foraminiferal and sedimentological response to the evolution of the Adra submarine delta, northern Alboran Sea

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dc.contributor.authorMendes, Isabel
dc.contributor.authorLobo, F. J.
dc.contributor.authorFerreira, Óscar
dc.contributor.authorSchönfeld, J.
dc.contributor.authorRosa, F.
dc.contributor.authorBárcenas, P.
dc.contributor.authorFernandez-Salas, L. M.
dc.contributor.authorLópez-González, N.
dc.contributor.authorDias, J. A.
dc.date.accessioned2017-11-20T17:48:13Z
dc.date.available2017-11-20T17:48:13Z
dc.date.issued2013
dc.description.abstractThe Adra submarine delta is located on the northern Alboran Sea shelf in the western Mediterranean Sea. The genesis of this deltaic system is associated with the discharges of the short and mountainous Adra River. The area is under the influence of a Mediterranean climate with sporadic winter torrential flows and increased summer aridity. Major anthropogenic activities in the river system occurred in 1872 AD, with the deviation of the main fluvial course to the east. The channel was silted up in 1910 AD as result of a flood event and relocated further west, at its present position. These artificial changes are reflected in the submarine morpho‐stratigraphy of the delta that is composed of two main lobes. In order to understand the interaction between river discharges and the evolution of the submarine delta at different timescales, two sediment cores were collected from both lobes. A chronological framework was performed and combined with sedimentological and benthic foraminiferal analyses. Radiocarbon dating of plant debris from the base of the cores indicates that the sedimentary record goes back 250 years BP. The correlation of sediment cores with seismic records indicate that both cores penetrated the same seismic unit, deposited between ca. 1070 to ca. 1872 AD, under the direct influence of the ancient river course. The predominant sedimentary facies is sandy silt with intercalated sand layers. The uppermost core sections are pure sand. The number of benthic foraminifera is generally below 100 specimens per gram. The most abundant species in both cores are Ammonia tepida, Bolivina ordinaria, Nonionella stella, Reophax arctica and Textularia earlandi. The increases of sand and the low faunal density, followed by increased abundance of successful colonizers and opportunistic species, is interpreted as result of periods of high precipitation, and sediment supply to the shelf, and the subsequent establishment of an environment with new ecological constrains.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationMendes, I., Lobo, F.J., Ferreira, Ó., Schönfeld, J., Rosa, F.,Bárcenas, P., Fernandez-Salas, L.M., López-González, N., Dias, J.A., 2013. Benthic foraminiferal and sedimentological response to the evolution of the Adra submarine delta, northern Alboran Sea. 11th International Conference on Paleoceanography, 1-6 September, Sitges – Barcelona, Spain (Digital)pt_PT
dc.identifier.otherAUT: OFE00989;
dc.identifier.otherAUT: OFE00989;
dc.identifier.urihttp://hdl.handle.net/10400.1/10197
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.subjectHuman impactpt_PT
dc.subjectClimate variabilitypt_PT
dc.subjectBenthic Foraminiferapt_PT
dc.subjectAlboran Seapt_PT
dc.titleBenthic foraminiferal and sedimentological response to the evolution of the Adra submarine delta, northern Alboran Seapt_PT
dc.typeconference object
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBPD%2F72869%2F2010/PT
oaire.citation.conferencePlaceBarcelona, Spainpt_PT
oaire.citation.title11th International Conference on Paleoceanographypt_PT
oaire.fundingStreamSFRH
person.familyNamede Paiva Pinto Mendes
person.familyNameFerreira
person.givenNameIsabel Maria
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.rightsopenAccesspt_PT
rcaap.typeconferenceObjectpt_PT
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relation.isAuthorOfPublication.latestForDiscovery14adf536-4f81-42de-b00f-6d1cf3b0d75e
relation.isProjectOfPublication510b1b42-618a-42ca-91d0-3feb00a1967a
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