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Re-evaluation of the "elevated epifauna" as indicator of Mediterranean Outflow Water in the Gulf of Cadiz using stable isotopes (delta C-13, delta O-18)

dc.contributor.authorGarcia-Gallardo, Angela
dc.contributor.authorGrunert, Patrick
dc.contributor.authorVoelker, Antje
dc.contributor.authorMendes, Isabel
dc.contributor.authorPiller, Werner E.
dc.date.accessioned2018-12-07T14:52:39Z
dc.date.available2018-12-07T14:52:39Z
dc.date.issued2017-08
dc.description.abstractThe presence and high abundances of the benthic foraminiferal group "elevated epifauna" has been proposed as indicator of the existence of Mediterranean Outflow Water (MOW) in the Gulf of Cadiz. Here we intend to use this potential proxy to reconstruct MOW in the early Pliocene at the Integrated Ocean Drilling Program (IODP) Hole U1387C. Cibicides lobatulus, Planulina ariminensis and Cibicides refulgens were found at this site, but high abundances of C. lobatulus and C. refulgens coincide with increases of shelf taxa and grain size, related to episodes of downslope transport. This issue calls into question the applicability of these species as MOW proxies. The present study therefore reassesses the role of these three elevated epifaunal species by means of stable isotope analyses (delta O-18, delta C-13) by contrasting their isotopic signature with that of shelf dwellers and deep-water taxa from Pliocene and Recent sediments from the Gulf of Cadiz and the western Iberian margin. Since foraminiferal calcite does not always precipitate in equilibrium with seawater, substantial efforts have been taken in order to determine species-specific offset values and to correct the isotopic signature for vital effects. Our corrected results demonstrate that C. lobatulus and C. refulgens are isotopically similar to the shelf dwellers in the Pliocene data set, eliminating them as MOW indicators. Recent samples from the Gulf of Cadiz and the western Portugal shelf corroborate the wide bathymetric range of C. lobatulus from the shelf to the slope. Our results thus warrant for caution when considering C. lobatulus and C. refulgens as indicators of bottom current strength in unstable slope settings, particularly when co-occurring with allochthonous shelf dwellers. In contrast, P. ariminensis shows a signature close to deep-water taxa, corroborating its reliability as indicator of MOW.
dc.description.sponsorshipAustrian Science Fund (FWF) [P25831-N29]; Portuguese Foundation for Science and Technology (FCT) [SFRH/BPD/72869/2010, PDCTM/40017/2003, IF/01500/2014]; CCMAR [UID/Multi/04326/2013]; project CRIDA (Consequences of River Discharge Modifications on Coastal Zones and Continental Shelf) [PDCTM/P/MAR/15289/1999]; project CIRCO (Climate changes from isotopic records during the Holocene in South-western Iberia) [PTDC/CLI/66393/2006]
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.1016/j.gloplacha.2017.06.005
dc.identifier.issn0921-8181
dc.identifier.issn1872-6364
dc.identifier.urihttp://hdl.handle.net/10400.1/11146
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier Science Bv
dc.relationClimate changes from isotopic records during the Holocene in South-western Iberia (CIRCO)
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectBenthic foraminiferal assemblages
dc.subjectPortuguese continental-margin
dc.subjectMessinian salinity crisis
dc.subjectSurface ocean productivity
dc.subjectRecent sediment transport
dc.subjectWestern Iberian margin
dc.subjectOrganic-carbon flux
dc.subjectShelf Northern Gulf
dc.subjectMicrohabitat preferences
dc.subjectAtlantic-Ocean
dc.titleRe-evaluation of the "elevated epifauna" as indicator of Mediterranean Outflow Water in the Gulf of Cadiz using stable isotopes (delta C-13, delta O-18)
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleClimate changes from isotopic records during the Holocene in South-western Iberia (CIRCO)
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBPD%2F72869%2F2010/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FMulti%2F04326%2F2013/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FCLI%2F66393%2F2006/PT
oaire.citation.endPage97
oaire.citation.startPage78
oaire.citation.titleGlobal and Planetary Change
oaire.citation.volume155
oaire.fundingStreamSFRH
oaire.fundingStream5876
oaire.fundingStream3599-PPCDT
person.familyNameGrunert
person.familyNameVoelker
person.familyNameMendes
person.familyNamePiller
person.givenNamePatrick
person.givenNameAntje
person.givenNameIsabel Maria de Paiva Pinto
person.givenNameWerner E.
person.identifier2315310
person.identifier.ciencia-idC11E-D8E6-CDFA
person.identifier.ciencia-id5C15-242C-FDC0
person.identifier.orcid0000-0002-3633-8674
person.identifier.orcid0000-0001-6465-6023
person.identifier.orcid0000-0001-7004-7910
person.identifier.orcid0000-0003-2808-4720
person.identifier.ridC-5427-2012
person.identifier.scopus-author-id8784446000
person.identifier.scopus-author-id7003380693
project.funder.identifierhttp://doi.org/10.13039/501100001871
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
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccess
rcaap.typearticle
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