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Diatoms as a paleoproductivity proxy in the NW Iberian coastal upwelling system (NE Atlantic)

2017-03Journal article Open Access
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dc.contributor.authorZuniga, Diana
dc.contributor.authorSantos, Célia
dc.contributor.authorFrojan, Maria
dc.contributor.authorSalgueiro, Emilia
dc.contributor.authorRufino, Marta
dc.contributor.authorDe la Granda, Francisco
dc.contributor.authorFigueiras, Francisco G.
dc.contributor.authorCastro, Carmen G.
dc.contributor.authorAbrantes, Fatima
dc.date.accessioned2018-12-07T14:53:38Z
dc.date.available2018-12-07T14:53:38Z
dc.date.issued2017-03
dc.description.abstractThe objective of the current work is to improve our understanding of how water column diatom's abundance and assemblage composition is seasonally transferred from the photic zone to seafloor sediments. To address this, we used a dataset derived from water column, sediment trap and surface sediment samples recovered in the NW Iberian coastal upwelling system. Diatom fluxes (2.2 (+/- 5.6) 10(6) valves m(-2) d(-1)) represented the majority of the siliceous microorganisms sinking out from the photic zone during all studied years and showed seasonal variability. Contrasting results between water column and sediment trap diatom abundances were found during downwelling periods, as shown by the unexpectedly high diatom export signals when diatom- derived primary production achieved their minimum levels. They were principally related to surface sediment remobilization and intense Minho and Douro river discharge that constitute an additional source of particulate matter to the inner continental shelf. In fact, contributions of allochthonous particles to the sinking material were confirmed by the significant increase of both benthic and freshwater diatoms in the sediment trap assemblage. In contrast, we found that most of the living diatom species blooming during highly productive upwelling periods were dissolved during sinking, and only those resistant to dissolution and the Chaetoceros and Leptocylindrus spp. resting spores were susceptible to being exported and buried. Fur-thermore, Chaetoceros spp. dominate during spring-early summer, when persistent northerly winds lead to the upwelling of nutrient-rich waters on the shelf, while Leptocylindrus spp. appear associated with late-summer upwelling relaxation, characterized by water column stratification and nutrient depletion. These findings evidence that the contributions of these diatom genera to the sediment's total marine diatom assemblage should allow for the reconstruction of different past upwelling regimes.
dc.description.sponsorshipCAIBEX [CTM2007-66408-C02-01/MAR]; REIMAGE [CTM2011-30155-C03-03]; Spanish Government, EXCAPA project [10MDS402013PR]; Xunta de Galicia; EU FEDER [INTERREG 2009/2011-0313/RAIA/E]; RAIA. co [INTERREG2011/2013-052/RAIA.co/1E]; CALIBERIA project [PTDC/MAR/102045/2008]; Fundacao para a Ciencia e a Tecnologia (FCT-Portugal) [COMPETE/FEDER-FCOMP01-0124-FEDER-010599]; Xunta de Galicia (Spain) [SFRH/BPD/111433/2015]; FCT (Portugal) [SFRH/BPD/111433/2015]; [SFRH/BD/88439/2012]
dc.identifier.doi10.5194/bg-14-1165-2017
dc.identifier.issn1726-4170
dc.identifier.issn1726-4189
dc.identifier.urihttp://hdl.handle.net/10400.1/11611
dc.language.isoeng
dc.peerreviewedyes
dc.publisherCopernicus Gesellschaft Mbh
dc.relationUnderstanding the hydrography and productivity variability during the beginning of Mid-Pleistocene Transition on the SW Portuguese Margin
dc.relationMARINE PRIMARY PRODUCTIVITY DURING THE MID-PLEISTOCENE TRANSITION OFF PORTUGAL: A PERSPECTIVE FROM DIATOMS AND DIATOM SPECIFIC BIOMARKERS
dc.subjectSediment Record
dc.subjectDistribution Patterns
dc.subjectContinental-Shelf
dc.subjectSurface Sediments
dc.subjectNorthwest Iberia
dc.subjectWater Column
dc.subjectGalician Ria
dc.subjectAssemblages
dc.subjectSpain
dc.subjectOcean
dc.titleDiatoms as a paleoproductivity proxy in the NW Iberian coastal upwelling system (NE Atlantic)
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleUnderstanding the hydrography and productivity variability during the beginning of Mid-Pleistocene Transition on the SW Portuguese Margin
oaire.awardTitleMARINE PRIMARY PRODUCTIVITY DURING THE MID-PLEISTOCENE TRANSITION OFF PORTUGAL: A PERSPECTIVE FROM DIATOMS AND DIATOM SPECIFIC BIOMARKERS
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/OE/SFRH%2FBPD%2F111433%2F2015/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT//SFRH%2FBD%2F88439%2F2012/PT
oaire.citation.endPage1179
oaire.citation.issue5
oaire.citation.startPage1165
oaire.citation.titleBiogeosciences
oaire.citation.volume14
oaire.fundingStreamOE
person.familyNameSalgueiro
person.familyNameRufino
person.familyNameAbrantes
person.givenNameEmilia
person.givenNameMarta
person.givenNameFatima
person.identifier.ciencia-id3B10-07FD-161C
person.identifier.ciencia-id7E12-F7C8-156B
person.identifier.ciencia-id021D-CA76-20D2
person.identifier.orcid0000-0003-1000-2977
person.identifier.orcid0000-0002-0734-7491
person.identifier.orcid0000-0002-9110-0212
person.identifier.ridG-1019-2013
person.identifier.ridB-5985-2013
person.identifier.scopus-author-id23486371200
person.identifier.scopus-author-id6701333407
person.identifier.scopus-author-id16030759200
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
rcaap.rightsopenAccess
rcaap.typearticle
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