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    Responses of physiological groups of tropical heterotrophic bacteria to temperature and DOM additions: food matters more than warming.

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    1462-2920.15007.pdf
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    Description:
    Accepted manuscript
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    Type
    Article
    Authors
    Moran, Xose Anxelu G. cc
    Baltar, Federico cc
    Carreira, Cátia
    Lønborg, Christian cc
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Marine Science Program
    Microbial oceanography Research Group
    Red Sea Research Center (RSRC)
    Date
    2020-04-15
    Online Publication Date
    2020-04-15
    Print Publication Date
    2020-05
    Embargo End Date
    2021-04-07
    Submitted Date
    2019-11-27
    Permanent link to this record
    http://hdl.handle.net/10754/662482
    
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    Abstract
    Compared to higher latitudes, tropical heterotrophic bacteria may be less responsive to warming because of strong bottom-up control. In order to separate both drivers we determined the growth responses of bacterial physiological groups to temperature after adding dissolved organic matter (DOM) from mangroves, seagrasses and glucose to natural seawater from the Great Barrier Reef. Low (LNA) and high (HNA) nucleic acid content, membrane-intact (Live) and membrane-damaged (Dead) plus actively respiring (CTC+) cells were monitored for 4 days. Specific growth rates of the whole community were significantly higher (1.9 d-1 ) in the mangrove treatment relative to the rest (0.2-0.4 d-1 ) at in situ temperature and their temperature dependence, estimated as activation energy, was also consistently higher. Strong bottom-up control was suggested in the other treatments. Cell size depended more on DOM than temperature. Mangrove DOM resulted in significantly higher contributions of Live, HNA and CTC+ cells to total abundance while the seagrass leachate reduced Live cells below 50%. Warming significantly decreased Live and CTC+ cells contributions in most treatments. Our results suggest that only in the presence of highly labile compounds, such as mangroves DOM, can we anticipate increases in heterotrophic bacteria biomass in response to warming in tropical regions. This article is protected by copyright. All rights reserved.
    Citation
    Morán, X. A. G., Baltar, F., Carreira, C., & Lønborg, C. (2020). Responses of physiological groups of tropical heterotrophic bacteria to temperature and DOM additions: food matters more than warming. Environmental Microbiology. doi:10.1111/1462-2920.15007
    Publisher
    Wiley
    Journal
    Environmental microbiology
    DOI
    10.1111/1462-2920.15007
    PubMed ID
    32249543
    Additional Links
    http://doi.wiley.com/10.1111/1462-2920.15007
    ae974a485f413a2113503eed53cd6c53
    10.1111/1462-2920.15007
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Red Sea Research Center (RSRC); Marine Science Program

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