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dc.contributor.authorTalarmin, Agathe Anne Gaelle
dc.contributor.authorVan Wambeke, F.
dc.contributor.authorLebaron, P.
dc.contributor.authorMoutin, T.
dc.date.accessioned2015-03-17T13:21:32Z
dc.date.available2015-03-17T13:21:32Z
dc.date.issued2015-02-26
dc.identifier.citationVertical partitioning of phosphate uptake among picoplankton groups in the low Pi Mediterranean Sea 2015, 12 (4):1237 Biogeosciences
dc.identifier.issn1726-4189
dc.identifier.doi10.5194/bg-12-1237-2015
dc.identifier.urihttp://hdl.handle.net/10754/346734
dc.description.abstractMicrobial transformations are key processes in marine phosphorus cycling. In this study, we investigated the contribution of phototrophic and heterotrophic groups to phosphate (Pi) uptake fluxes in the euphotic zone of the low-Pi Mediterranean Sea and estimated Pi uptake kinetic characteristics. Surface soluble reactive phosphorus (SRP) concentrations were in the range of 6-80 nmol Lg'1 across the transect, and the community Pi turnover times, assessed using radiolabeled orthophosphate incubations, were longer in the western basin, where the highest bulk and cellular rates were measured. Using live cell sorting, four vertical profiles of Pi uptake rates were established for heterotrophic prokaryotes (Hprok), phototrophic picoeukaryotes (Pic) and $\textit{Prochlorococcus}$ (Proc) and $\textit{Synechococcus}$ (Syn) cyanobacteria. Hprok cells contributed up to 82% of total Pi uptake fluxes in the superficial euphotic zone, through constantly high abundances (2.7-10.2 × 105 cells mLg'1) but variable cellular rates (6.6 ± 9.3 amol P cellg'1 hg'1). Cyanobacteria achieved most of the Pi uptake (up to 62%) around the deep chlorophyll maximum depth, through high abundances (up to 1.4 × 105 Proc cells mLg'1) and high cellular uptake rates (up to 40 and 402 amol P cellg'1 hg'1, respectively for Proc and Syn cells). At saturating concentrations, maximum cellular rates up to 132 amol P cellg'1 hg'1 were measured for Syn at station (St.) C, which was 5 and 60 times higher than Proc and Hprok, respectively. Pi uptake capabilities of the different groups likely contribute to their vertical distribution in the low Pi Mediterranean Sea, possibly along with other energy limitations.
dc.publisherCopernicus GmbH
dc.relation.urlhttp://www.biogeosciences.net/12/1237/2015/
dc.rightsThis work is distributed under the Creative Commons Attribution 3.0 License.
dc.titleVertical partitioning of phosphate uptake among picoplankton groups in the low Pi Mediterranean Sea
dc.typeArticle
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Division
dc.contributor.departmentRed Sea Research Center (RSRC)
dc.identifier.journalBiogeosciences
dc.eprint.versionPublisher's Version/PDF
dc.contributor.institutionAix Marseille Université, Mediterranean Institute of Oceanography (MIO), 13288, Marseille, CEDEX 9, France
dc.contributor.institutionUniversité de Toulon, 83957, CNRS-INSU/IRD, France
dc.contributor.institutionSorbonne Universités, UPMC Univ. Paris 06, USR 3579, LBBM, Observatoire Océanologique, 66650, Banyuls-sur-Mer, France
dc.contributor.institutionCNRS, USR 3579, LBBM, Observatoire Océanologique, 66650 Banyuls-sur-Mer, France
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)
kaust.personTalarmin, Agathe Anne Gaelle
refterms.dateFOA2018-06-13T16:17:24Z


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