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    Experimental Warming Decreases the Average Size and Nucleic Acid Content of Marine Bacterial Communities

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    Type
    Article
    Authors
    Huete-Stauffer, Tamara M.
    Arandia-Gorostidi, Nestor
    Alonso-Sáez, Laura
    Moran, Xose Anxelu G. cc
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Marine Science Program
    Red Sea Research Center (RSRC)
    Date
    2016-05-23
    Permanent link to this record
    http://hdl.handle.net/10754/613034
    
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    Abstract
    Organism size reduction with increasing temperature has been suggested as a universal response to global warming. Since genome size is usually correlated to cell size, reduction of genome size in unicells could be a parallel outcome of warming at ecological and evolutionary time scales. In this study, the short-term response of cell size and nucleic acid content of coastal marine prokaryotic communities to temperature was studied over a full annual cycle at a NE Atlantic temperate site. We used flow cytometry and experimental warming incubations, spanning a 6°C range, to analyze the hypothesized reduction with temperature in the size of the widespread flow cytometric bacterial groups of high and low nucleic acid content (HNA and LNA bacteria, respectively). Our results showed decreases in size in response to experimental warming, which were more marked in 0.8 μm pre-filtered treatment rather than in the whole community treatment, thus excluding the role of protistan grazers in our findings. Interestingly, a significant effect of temperature on reducing the average nucleic acid content (NAC) of prokaryotic cells in the communities was also observed. Cell size and nucleic acid decrease with temperature were correlated, showing a common mean decrease of 0.4% per °C. The usually larger HNA bacteria consistently showed a greater reduction in cell and NAC compared with their LNA counterparts, especially during the spring phytoplankton bloom period associated to maximum bacterial growth rates in response to nutrient availability. Our results show that the already smallest planktonic microbes, yet with key roles in global biogeochemical cycling, are likely undergoing important structural shrinkage in response to rising temperatures.
    Citation
    Experimental Warming Decreases the Average Size and Nucleic Acid Content of Marine Bacterial Communities 2016, 7 Frontiers in Microbiology
    Sponsors
    This work was supported by the Spanish Ministry of Economy and Competitiveness (MINECO) through funding of the COMITE (Coastal Ocean MIcrobial plankton and TEmperature) project (CTM-2010-15840) and the associated Ph.D. scholarship (BES-2011-048573) to TH-S, as well as the time-series project RADIALES of the IEO. As well, the Basque Government provided NA-G with a Ph.D. scholarship.
    Publisher
    Frontiers Media SA
    Journal
    Frontiers in Microbiology
    DOI
    10.3389/fmicb.2016.00730
    PubMed ID
    27242747
    Additional Links
    http://journal.frontiersin.org/article/10.3389/fmicb.2016.00730
    ae974a485f413a2113503eed53cd6c53
    10.3389/fmicb.2016.00730
    Scopus Count
    Collections
    Articles; Biological and Environmental Sciences and Engineering (BESE) Division; Red Sea Research Center (RSRC); Marine Science Program; Plankton Genomics, part of the Global Ocean Genome Project

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