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Environmental changes at the seafloor of the Faro drift (Gulf of Cadiz) during the transition from the early to the middle pleistocene

2026-01-30Artigo científico Acesso aberto
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datacite.subject.sdg14:Proteger a Vida Marinha
datacite.subject.sdg13:Ação Climática
datacite.subject.sdg09:Indústria, Inovação e Infraestruturas
dc.contributor.authorSilveira Molina, Giulia
dc.contributor.authorSchmiedl, Gerhard
dc.contributor.authorJiménez-Espejo, Francisco
dc.contributor.authorKuhnert, Henning
dc.contributor.authorAnica Claro Rodrigues, Teresa Isabel
dc.contributor.authorVoelker, Antje
dc.date.accessioned2026-03-05T10:39:10Z
dc.date.available2026-03-05T10:39:10Z
dc.date.issued2026-01-30
dc.description.abstractThis study explores the ecology of the benthic foraminifera fauna and reconstructs bottom water oxygenation, organic matter fluxes, and Mediterranean Outflow Water (MOW) dynamics in the Gulf of Cadiz during the Early to Middle Pleistocene Transition (EMPT) interval of Marine Isotope Stage (MIS) 28 to MIS 19 (1014–761 ka) using high-resolution multiproxy data from IODP Site U1387. Along with benthic foraminifera assemblages, we integrate stable isotopes (δ 18O and δ 13C), organic carbon, alkenone concentrations, and geochemical and sedimentological proxies (Zr/Al ratio, grain size) to identify environmental drivers across glacial– interglacial cycles and millennial-scale events. Furthermore, the absolute abundance of Planulina ariminensis is applied as a proxy for bottom current strength. Principal component analysis confirms assemblage responses to variations in organic matter quality and oxygenation. Periods of intensified MOW during stadial climate stages correspond to enhanced bottom water ventilation, reflected in higher abundances of epifaunal and porcelaneous taxa, higher diversity, and increased dissolved oxygen, with the exception of the late MIS 22. Intervals of reduced ventilation (e.g. interglacial MIS 27, MIS 25e, MIS 21g, MIS 19c) coincide with higher total alkenone concentrations, potentially contributing to low oxygen conditions and increased proportions of infaunal taxa. Our results reveal that bottom water dynamics at Site U1387 were controlled by local oceanographic processes (e.g. coastal upwelling, river discharge, water column stratification) rather than by global ice volume changes only. These findings highlight the importance of understanding regional oceanographic variations during the EMPT and emphasize the value of combining food supply, oxygenation, and bottom current proxies to interpret benthic foraminifera ecological changes.eng
dc.description.sponsorshipUID/04326/2025; UID/PRR/04326/2025; POCI-01-933 0145-FEDER-022157
dc.identifier.doi10.5194/jm-45-117-2026
dc.identifier.issn2041-4978
dc.identifier.urihttp://hdl.handle.net/10400.1/28336
dc.language.isoeng
dc.peerreviewedyes
dc.publisherCopernicus Publications
dc.relationSurface and Mediterranean Outflow Water Dynamics in the Gulf of Cadiz during the Pleistocene
dc.relationCentre for Marine and Environmental Research
dc.relation.ispartofJournal of Micropalaeontology
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.titleEnvironmental changes at the seafloor of the Faro drift (Gulf of Cadiz) during the transition from the early to the middle pleistoceneeng
dc.typejournal article
dspace.entity.typePublication
oaire.awardNumberPTDC/MAR-PRO/3761/2012
oaire.awardNumberLA/P/0101/2020
oaire.awardTitleSurface and Mediterranean Outflow Water Dynamics in the Gulf of Cadiz during the Pleistocene
oaire.awardTitleCentre for Marine and Environmental Research
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FMAR-PRO%2F3761%2F2012/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/LA%2FP%2F0101%2F2020/PT
oaire.citation.issue1
oaire.citation.titleJournal of Micropalaeontology
oaire.citation.volume45
oaire.fundingStream3599-PPCDT
oaire.fundingStream6817 - DCRRNI ID
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameSilveira Molina
person.familyNameAnica Claro Rodrigues
person.familyNameVoelker
person.givenNameGiulia
person.givenNameTeresa Isabel
person.givenNameAntje
person.identifier2315310
person.identifier.ciencia-id5D1F-695E-2D60
person.identifier.ciencia-idC11E-D8E6-CDFA
person.identifier.orcid0000-0001-7992-8298
person.identifier.orcid0009-0007-6070-7808
person.identifier.orcid0000-0001-6465-6023
person.identifier.ridC-5427-2012
person.identifier.scopus-author-id8784446000
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
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relation.isAuthorOfPublication879ec88c-74fe-431a-b593-5aec079a1419
relation.isAuthorOfPublicationbca80a86-eb35-4bca-a4ba-85b53831d69e
relation.isAuthorOfPublication.latestForDiscovery879ec88c-74fe-431a-b593-5aec079a1419
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