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    Protistan community patterns within the brine and halocline of deep hypersaline anoxic basins in the eastern Mediterranean Sea

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    Author's draft (93.34Kb)
    Figures (624.7Kb)
    Date
    2008-10-21
    Author
    Edgcomb, Virginia P.  Concept link
    Orsi, William D.  Concept link
    Leslin, Chesley  Concept link
    Epstein, Slava S.  Concept link
    Bunge, John  Concept link
    Jeon, Sunok  Concept link
    Yakimov, Michail M.  Concept link
    Behnke, Anke  Concept link
    Stoeck, Thorsten  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/3084
    As published
    https://doi.org/10.1007/s00792-008-0206-2
    Keyword
     Anoxic; Brine; Community structure; Deep-sea; DHAB; Hypersaline; Molecular diversity; Protists 
    Abstract
    Environmental factors restrict the distribution of microbial eukaryotes but the exact boundaries for eukaryotic life are not known. Here we examine protistan communities at the extremes of salinity and osmotic pressure, and report rich assemblages inhabiting Bannock and Discovery, two deep-sea superhaline anoxic basins in the Mediterranean. Using a rRNA-based approach, we detected 1538 protistan rRNA gene sequences from water samples with total salinity ranging from 39 g/kg to 280 g/Kg, and obtained evidence that this DNA was endogenous to the extreme habitats sampled. Statistical analyses indicate that the discovered phylotypes represent only a fraction of species actually inhabiting both the brine and the brine-seawater interface, with as much as 82% of the actual richness missed by our survey. Jaccard indices (e.g., for a comparison of community membership) suggest that the brine/interface protistan communities are unique to Bannock and Discovery basins, and share little (0.8-2.8%) in species composition with overlying waters with typical marine salinity and oxygen tension. The protistan communities from the basins’ brine and brine/seawater interface appear to be particularly enriched with dinoflagellates, ciliates and other alveolates, as well as fungi, and are conspicuously poor in stramenopiles. The uniqueness and diversity of brine and brine-interface protistan communities make them promising targets for protistan discovery.
    Description
    Author Posting. © The Author(s), 2008. This is the author's version of the work. It is posted here by permission of Springer for personal use, not for redistribution. The definitive version was published in Extremophiles 13 (2009): 151-167, doi:10.1007/s00792-008-0206-2.
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    • Geology and Geophysics (G&G)
    Suggested Citation
    Preprint: Edgcomb, Virginia P., Orsi, William D., Leslin, Chesley, Epstein, Slava S., Bunge, John, Jeon, Sunok, Yakimov, Michail M., Behnke, Anke, Stoeck, Thorsten, "Protistan community patterns within the brine and halocline of deep hypersaline anoxic basins in the eastern Mediterranean Sea", 2008-10-21, https://doi.org/10.1007/s00792-008-0206-2, https://hdl.handle.net/1912/3084
     

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