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Diatom species fluxes in the seasonally ice-covered Antarctic Zone:. New data from offshore Prydz Bay and comparison with other regions from the eastern Antarctic and western Pacific sectors of the Southern Ocean

2019-03Journal article Open access
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dc.contributor.authorRigual-Hernandez, A. S.
dc.contributor.authorPilskaln, C. H.
dc.contributor.authorCortina, A.
dc.contributor.authorAbrantes, Fatima
dc.contributor.authorArmand, L. K.
dc.date.accessioned2020-07-24T10:52:43Z
dc.date.available2020-07-24T10:52:43Z
dc.date.issued2019-03
dc.description.abstractThe Antarctic Zone, the southernmost belt of the Antarctic Circumpolar Current, plays an important role in the control of atmospheric carbon dioxide concentrations. In the last decade, a number of studies have highlighted the importance of diatom assemblage composition in influencing the magnitude of the organic carbon and biogenic silica fluxes exported out of the mixed layer in Southern Ocean ecosystems. Here we investigate the relationship between the makeup of the diatom assemblage, organic carbon and biogenic silica export and several significant environmental parameters using sediment trap records deployed in different sectors of the Antarctic Zone. The study is divided in two parts. We first present unpublished diatom species flux data collected by a sediment trap in the offshore waters of Prydz Bay (Station PZB-1) over a year. The results of this study revealed a major export peak of diatom valves in Austral summer and two small unexpected secondary flux pulses dining full winter conditions. The summer diatom sinking assemblages were largely composed of small and rapidly dividing species such as Fragilariopsis cylindrus, Fragilariopsis curta and Pseudo-nitzschia lineola, while winter assemblages were dominated by Fragilariopsis kerguelensis most reflecting its persistent strategy and selective preservation. In the second part of the study, we compare the annual diatom assemblage composition and biogeochemical fluxes of Station PZB-1 with flux data documented in previous sediment trap studies conducted in other sectors of the Antarctic Zone in order to investigate how diatom floristics influence the composition and magnitude of particle fluxes in the Antarctic Zone. The lack of correlation between the annual diatom valve, organic carbon and biogenic silica fluxes across stations indicates that other factors aside from diatom abundance play a major role in the carbon and silica export in AZ. Among these factors, the composition of the diatom assemblage appears to be critical, as suggested by the strong and significant correlation between Bio-SiO2 and the valve fluxes of F. kerguelensis alone, that this species is the main Bio-SiO2 vector from the surface layer to the deep ocean in the AZ waters, regardless of its relative abundance. Lastly, the good correlation between the annual fluxes of the group of small Fragilariopsis species with satellite-derived chlorophyll-a concentration estimates over the study stations, suggest that high abundances of these species in the Southern Ocean paleorecords could be used as a proxy of high algal biomass accumulation.
dc.description.sponsorshipNSFNational Science Foundation (NSF) [OPP-9726186]
dc.description.sponsorshipCCMAR [PEstC/MAR/LA0015/2013]
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.1016/j.dsr2.2018.06.005
dc.identifier.issn0967-0645
dc.identifier.issn1879-0100
dc.identifier.urihttp://hdl.handle.net/10400.1/14397
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.relationEuropean Marine Biological Research Infrastructure Cluster to promote the Blue Bioeconomy
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectZooplankton fecal pellets
dc.subjectIron-fertilized waters
dc.subjectPolar frontal zones
dc.subjectSea-ice
dc.subjectParticle fluxes
dc.subjectOrganic-carbon
dc.subjectPhytoplankton biomass
dc.subjectCommunity structure
dc.subjectSurface sediments
dc.subjectSpatial-distribution
dc.titleDiatom species fluxes in the seasonally ice-covered Antarctic Zone:. New data from offshore Prydz Bay and comparison with other regions from the eastern Antarctic and western Pacific sectors of the Southern Ocean
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleEuropean Marine Biological Research Infrastructure Cluster to promote the Blue Bioeconomy
oaire.awardURIinfo:eu-repo/grantAgreement/EC/H2020/654008/EU
oaire.citation.endPage104
oaire.citation.startPage92
oaire.citation.titleDeep Sea Research Part II: Topical Studies in Oceanography
oaire.citation.volume161
oaire.fundingStreamH2020
person.familyNameAbrantes
person.givenNameFatima
person.identifier.ciencia-id021D-CA76-20D2
person.identifier.orcid0000-0002-9110-0212
person.identifier.ridB-5985-2013
person.identifier.scopus-author-id16030759200
project.funder.identifierhttp://doi.org/10.13039/501100008530
project.funder.nameEuropean Commission
rcaap.rightsopenAccess
rcaap.typearticle
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relation.isAuthorOfPublication.latestForDiscovery45b2d36a-1a11-4b6c-81b3-47f657904207
relation.isProjectOfPublicationd5cd89fe-f500-412a-ab83-8d5c84eed8b1
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