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dc.contributor.authorKrause, J. W.
dc.contributor.authorDuarte, Carlos M.
dc.contributor.authorMarquez, I. A.
dc.contributor.authorAssmy, Phillipp
dc.contributor.authorFernández-Méndez, Mar
dc.contributor.authorWiedmann, Ingrid
dc.contributor.authorWassmann, Paul
dc.contributor.authorKristiansen, Svein
dc.contributor.authorAgusti, Susana
dc.date.accessioned2019-03-20T19:04:47Z
dc.date.available2019-03-20T19:04:47Z
dc.date.issued2018-11-06
dc.description.abstractDiatoms are generally the dominant contributors to the Arctic Ocean spring bloom, which is a key event in regional food webs in terms of capacity for secondary production and organic matter export. Dissolved silicic acid is an obligate nutrient for diatoms and has been declining in the European Arctic since the early 1990s. The lack of regional silicon cycling information precludes understanding the consequences of such changes for diatom productivity during the Arctic spring bloom. This study communicates the results from a cruise in the European Arctic around Svalbard, which reports the first concurrent data on biogenic silica production and export, export of diatom cells, the degree of kinetic limitation by ambient silicic acid, and diatom contribution to primary production. Regional biogenic silica production rates were significantly lower than those achievable in the Southern Ocean and silicic acid concentration limited the biogenic silica production rate in 95 % of samples. Compared to diatoms in the Atlantic subtropical gyre, regional diatoms are less adapted for silicic acid uptake at low concentration, and at some stations during the present study, silicon kinetic limitation may have been intense enough to limit diatom growth. Thus, silicic acid can play a critical role in diatom spring bloom dynamics. The diatom contribution to primary production was variable, ranging from <10 % to ∼100 % depending on the bloom stage and phytoplankton composition. While there was agreement with previous studies regarding the export rate of diatom cells, we observed significantly elevated biogenic silica export. Such a discrepancy can be resolved if a higher fraction of the diatom material exported during our study was modified by zooplankton grazers. This study provides the most direct evidence to date suggesting the important coupling of the silicon and carbon cycles during the spring bloom in the European Arctic.en_US
dc.description.sponsorshipNorwegian Ministries of Foreign Affairs and Climate and Environmenten_US
dc.descriptionSource at <a href=https://doi.org/10.5194/bg-15-6503-2018> https://doi.org/10.5194/bg-15-6503-2018</a>.en_US
dc.identifier.citationKrause, J.W., Duarte, C.M., Marquez, I.A., Assmy, P., Fernández-Méndez, M., Wiedmann, I., ... Agusti, S. (2018). Biogenic silica production and diatom dynamics in the Svalbard region during spring. <i>Biogeosciences, 15</i>(21), 6503-6517. https://doi.org/10.5194/bg-15-6503-2018en_US
dc.identifier.cristinIDFRIDAID 1587808
dc.identifier.doi10.5194/bg-15-6503-2018
dc.identifier.issn1726-4170
dc.identifier.issn1726-4189
dc.identifier.urihttps://hdl.handle.net/10037/15038
dc.language.isoengen_US
dc.publisherEuropean Geosciences Union (EGU)en_US
dc.relation.journalBiogeosciences
dc.relation.projectIDinfo:eu-repo/grantAgreement/PETROSENTR/SFF/228107/Norway/Research Centre for Arctic Petroleum Exploration - ARCEx//en_US
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/POLARPROG/244646/Norway/Ice-algal and under-ice phytoplankton bloom dynamics in a changing Arctic icescape//en_US
dc.rights.accessRightsopenAccessen_US
dc.subjectVDP::Mathematics and natural science: 400::Zoology and botany: 480en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480en_US
dc.subjectVDP::Mathematics and natural science: 400::Geosciences: 450en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450en_US
dc.titleBiogenic silica production and diatom dynamics in the Svalbard region during springen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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