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    Biogeography of pelagic bacterioplankton across an antagonistic temperature-salinity gradient in the Red Sea

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    Type
    Article
    Authors
    Ngugi, David cc
    Antunes, Andre cc
    Brune, Andreas
    Stingl, Ulrich cc
    KAUST Department
    Red Sea Research Center (RSRC)
    Biological and Environmental Sciences and Engineering (BESE) Division
    Marine Science Program
    Marine Microbial Ecology Research Group
    Date
    2011-12-01
    Online Publication Date
    2011-12-01
    Print Publication Date
    2012-01
    Permanent link to this record
    http://hdl.handle.net/10754/561950
    
    Metadata
    Show full item record
    Abstract
    The Red Sea is a unique marine ecosystem with contrasting gradients of temperature and salinity along its north-to-south axis. It is an extremely oligotrophic environment that is characterized by perpetual year-round water column stratification, high annual solar irradiation, and negligible riverine and precipitation inputs. In this study, we investigated whether the contemporary environmental conditions shape community assemblages by pyrosequencing 16S rRNA genes of bacteria in surface water samples collected from the northeastern half of this water body. A combined total of 1855 operational taxonomic units (OTUs) were recovered from the 'small-cell' and 'large-cell' fractions. Here, a few major OTUs affiliated with Cyanobacteria and Proteobacteria accounted for â93% of all sequences, whereas a tail of 'rare' OTUs represented most of the diversity. OTUs allied to Surface 1a/b SAR11 clades and Prochlorococcus related to the high-light-adapted (HL2) ecotype were the most widespread and predominant sequence types. Interestingly, the frequency of taxa that are typically found in the upper mesopelagic zone was significantly elevated in the northern transects compared with those in the central, presumably as a direct effect of deep convective mixing in the Gulf of Aqaba and water exchange with the northern Red Sea. Although temperature was the best predictor of species richness across all major lineages, both spatial and environmental distances correlated strongly with phylogenetic distances. Our results suggest that the bacterial diversity of the Red Sea is as high as in other tropical seas and provide evidence for fundamental differences in the biogeography of pelagic communities between the northern and central regions. © 2011 Blackwell Publishing Ltd.
    Citation
    NGUGI, D. K., ANTUNES, A., BRUNE, A., & STINGL, U. (2011). Biogeography of pelagic bacterioplankton across an antagonistic temperature-salinity gradient in the Red Sea. Molecular Ecology, 21(2), 388–405. doi:10.1111/j.1365-294x.2011.05378.x
    Publisher
    Wiley
    Journal
    Molecular Ecology
    DOI
    10.1111/j.1365-294X.2011.05378.x
    PubMed ID
    22133021
    Relations
    Is Supplemented By:
    • [Bioproject]
      Title: Biogeography of pelagic bacterioplankton across an antagonistic temperature-salinity gradient in the Red SeaPublication Date: 2012-08-02. bioproject: PRJEB2645 Handle: 10754/666425
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1365-294X.2011.05378.x
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Red Sea Research Center (RSRC); Marine Science Program

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