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    Warming the phycosphere: differential effect of temperature on the use of diatom-derived carbon by two copiotrophic bacterial taxa.

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    Name:
    Arandia-Gorostidi_et_al-2020-Environmental_Microbiology.pdf
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    Description:
    Accepted manuscript
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    Type
    Article
    Authors
    Arandia-Gorostidi, Nestor cc
    Alonso-Sáez, Laura cc
    Stryhanyuk, Hryhoriy
    Richnow, Hans H
    Moran, Xose Anxelu G. cc
    Musat, Niculina
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Marine Science Program
    Microbial oceanography Research Group
    Red Sea Research Center (RSRC)
    Date
    2020-02-24
    Online Publication Date
    2020-02-24
    Print Publication Date
    2020-04
    Embargo End Date
    2021-02-25
    Submitted Date
    2019-07-24
    Permanent link to this record
    http://hdl.handle.net/10754/661696
    
    Metadata
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    Abstract
    Heterotrophic bacteria associated with microphytoplankton, particularly those colonizing the phycosphere, are major players in the remineralization of algal-derived carbon. Ocean warming might impact DOC uptake by microphytoplankton-associated bacteria with unknown biogeochemical implications. Here, by incubating natural seawater samples at 3 different temperatures we analyzed the effect of experimental warming on the abundance and C and N uptake activity of Rhodobacteraceae and Flavobacteria, two bacterial groups typically associated with microphytoplankton. Using NanoSIMS single-cell analysis we quantified the temperature-sensitivity of these two taxonomic groups to the uptake of algal-derived DOC in the microphytoplankton-associated fraction with 13 C-bicarbonate and 15 N-leucine as tracers. We found that cell-specific 13 C uptake was similar for both groups (~0.42 fg C h-1  μm-3 ), but Rhodobacteraceae were more active in 15 N-leucine uptake. Due to the higher abundance of Flavobacteria associated with microphytoplankton, this group incorporated 4-fold more carbon than Rhodobacteraceae. Cell-specific 13 C uptake was influenced by temperature, but no significant differences were found for 15 N-leucine uptake. Our results show that the contribution of Flavobacteria and Rhodobacteraceae to C assimilation increased up to 6-fold and 2-fold, respectively, with an increase of 3°C above ambient temperature, suggesting that warming may differently affect the contribution of distinct copiotrophic bacterial taxa to carbon cycling. This article is protected by copyright. All rights reserved.
    Citation
    Arandia-Gorostidi, N., Alonso-Sáez, L., Stryhanyuk, H., Richnow, H. H., Morán, X. A. G., & Musat, N. (2020). Warming the phycosphere: differential effect of temperature on the use of diatom-derived carbon by two copiotrophic bacterial taxa. Environmental Microbiology. doi:10.1111/1462-2920.14954
    Sponsors
    We are grateful to Basque Government for supporting N.A.G.’s Ph.D. fellowship the Spanish Ministry of Economy and Competitiveness (MINECO) for supporting L.A.S.’s Juan de la Cierva and Ramón y Cajal (RYC-2012-11404) fellowships and the COMITE project (CTM-2010–15840). We thank the Helmholtz Centre for Environmental Research and the Department of Isotope Biogeochemistry for providing the access to their infrastructure (ProVIS) and to M. G. for the EA-MS analysis. We are very thankful to all the staff of the R/V “José de Rioja” for their help during the sampling collection and L. Díaz and T.M. Huete-Stauffer for their help during the experiments.
    Publisher
    Wiley
    Journal
    Environmental microbiology
    DOI
    10.1111/1462-2920.14954
    Additional Links
    https://onlinelibrary.wiley.com/doi/abs/10.1111/1462-2920.14954
    ae974a485f413a2113503eed53cd6c53
    10.1111/1462-2920.14954
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Red Sea Research Center (RSRC); Marine Science Program

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