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    Vertical partitioning of phosphate uptake among picoplankton groups in the low Pi Mediterranean Sea

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    Type
    Article
    Authors
    Talarmin, Agathe Anne Gaelle cc
    Van Wambeke, F.
    Lebaron, P.
    Moutin, T.
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Red Sea Research Center (RSRC)
    Date
    2015-02-26
    Permanent link to this record
    http://hdl.handle.net/10754/346734
    
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    Abstract
    Microbial 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.
    Citation
    Vertical partitioning of phosphate uptake among picoplankton groups in the low Pi Mediterranean Sea 2015, 12 (4):1237 Biogeosciences
    Publisher
    Copernicus GmbH
    Journal
    Biogeosciences
    DOI
    10.5194/bg-12-1237-2015
    Additional Links
    http://www.biogeosciences.net/12/1237/2015/
    ae974a485f413a2113503eed53cd6c53
    10.5194/bg-12-1237-2015
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Red Sea Research Center (RSRC)

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