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dc.contributor.authorZúñiga, Dianaes_ES
dc.contributor.authorSantos, Celiaes_ES
dc.contributor.authorFroján, M.es_ES
dc.contributor.authorSalgueiro, E.es_ES
dc.contributor.authorRufino, Marta M.es_ES
dc.contributor.authorGranda Grandoso, Francisco de laes_ES
dc.contributor.authorFigueiras, F. G.es_ES
dc.contributor.authorCastro, Carmen G.es_ES
dc.contributor.authorAbrantes, Fátimaes_ES
dc.identifier.citationBiogeosciences 14: 1165-1179 (2017)es_ES
dc.description15 páginas, 1 apéndice, 8 figuras, 3 tablas.-- This work is distributed under the Creative Commons Attribution 3.0 Licensees_ES
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) 106 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. Furthermore, 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 regimeses_ES
dc.description.sponsorshipThis study was sponsored by CAIBEX (CTM2007-66408-C02-01/MAR) and REIMAGE (CTM2011-30155-C03-03) projects funded by the Spanish Government, EXCAPA project (10MDS402013PR) supported by Xunta de Galicia, the EU FEDER funded projects RAIA (INTERREG 2009/2011-0313/RAIA/E) and RAIA.co (INTERREG 2011/2013-052/RAIA.co/1E) and the CALIBERIA project (PTDC/MAR/102045/2008) financed by Fundação para a Ciência e a Tecnologia (FCT-Portugal) and COMPETE/FEDER -FCOMP- 01-0124-FEDER-010599. Diana Zúñiga and Emilia Salgueiro were funded by a postdoctoral fellowship (Plan I2C) from Xunta de Galicia (Spain) and (SFRH/BPD/111433/2015) from FCT, respectively. Celia Santos was funded by a doctoral grant from FCT (Portugal) (SFRH/BD/88439/2012)es_ES
dc.publisherEuropean Geosciences Uniones_ES
dc.relation.isversionofPublisher's versiones_ES
dc.titleDiatoms as a paleoproductivity proxy in the NW Iberian coastal upwelling system (NE Atlantic)es_ES
dc.description.peerreviewedPeer reviewedes_ES
oprm.item.hasRevisionno ko 0 false*
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