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    Diversity of methanogens and sulfate-reducing bacteria in the interfaces of five deep-sea anoxic brines of the Red Sea

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    Type
    Article
    Authors
    Guan, Yue cc
    Hikmawan, Tyas I. cc
    Antunes, Andre cc
    Ngugi, David cc
    Stingl, Ulrich cc
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Bioscience Program
    Computational Bioscience Research Center (CBRC)
    Marine Science Program
    Red Sea Research Center (RSRC)
    Date
    2015-11
    Permanent link to this record
    http://hdl.handle.net/10754/594182
    
    Metadata
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    Abstract
    Oceanic deep hypersaline anoxic basins (DHABs) are characterized by drastic changes in physico-chemical conditions in the transition from overlaying seawater to brine body. Brine-seawater interfaces (BSIs) of several DHABs across the Mediterranean Sea have been shown to possess methanogenic and sulfate-reducing activities, yet no systematic studies have been conducted to address the potential functional diversity of methanogenic and sulfate-reducing communities in the Red Sea DHABs. Here, we evaluated the relative abundance of Bacteria and Archaea using quantitative PCR and conducted phylogenetic analyses of nearly full-length 16S rRNA genes as well as functional marker genes encoding the alpha subunits of methyl-coenzyme M reductase (mcrA) and dissimilatory sulfite reductase (dsrA). Bacteria predominated over Archaea in most locations, the majority of which were affiliated with Deltaproteobacteria, while Thaumarchaeota were the most prevalent Archaea in all sampled locations. The upper convective layers of Atlantis II Deep, which bear increasingly harsh environmental conditions, were dominated by members of the class Thermoplasmata (Marine Benthic Group E and Mediterranean Sea Brine Lakes Group 1). Our study revealed unique microbial compositions, the presence of niche-specific groups, and collectively, a higher diversity of sulfate-reducing communities compared to methanogenic communities in all five studied locations. © 2015 Institut Pasteur.
    Citation
    Guan Y, Hikmawan T, Antunes A, Ngugi D, Stingl U (2015) Diversity of methanogens and sulfate-reducing bacteria in the interfaces of five deep-sea anoxic brines of the Red Sea. Research in Microbiology 166: 688–699. Available: http://dx.doi.org/10.1016/j.resmic.2015.07.002.
    Publisher
    Elsevier BV
    Journal
    Research in Microbiology
    DOI
    10.1016/j.resmic.2015.07.002
    PubMed ID
    26192212
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.resmic.2015.07.002
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Red Sea Research Center (RSRC); Bioscience Program; Marine Science Program; Computational Bioscience Research Center (CBRC)

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