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    Microbial diversity of hydrothermal sediments in the Guaymas Basin : evidence for anaerobic methanotrophic communities

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    Teske Microbial.pdf (2.379Mb)
    Date
    2002-04
    Author
    Teske, Andreas  Concept link
    Hinrichs, Kai-Uwe  Concept link
    Edgcomb, Virginia P.  Concept link
    de Vera Gomez, Alvin  Concept link
    Kysela, David  Concept link
    Sylva, Sean P.  Concept link
    Sogin, Mitchell L.  Concept link
    Jannasch, Holger W.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/186
    As published
    https://doi.org/10.1128/AEM.68.4.1994-2007.2002
    DOI
    10.1128/AEM.68.4.1994-2007.2002
    Keyword
     Anaerobic methanotrophy; Anaerobic methane oxidation 
    Abstract
    Microbial communities in hydrothermally active sediments of the Guaymas Basin (Gulf of California, Mexico) were studied by using 16S rRNA sequencing and carbon isotopic analysis of archaeal and bacterial lipids. The Guaymas sediments harbored uncultured euryarchaeota of two distinct phylogenetic lineages within the anaerobic methane oxidation 1 (ANME-1) group, ANME-1a and ANME-1b, and of the ANME-2c lineage within the Methanosarcinales, both previously assigned to the methanotrophic archaea. The archaeal lipids in the Guaymas Basin sediments included archaeol, diagnostic for nonthermophilic euryarchaeota, and sn-2-hydroxyarchaeol, with the latter compound being particularly abundant in cultured members of the Methanosarcinales. The concentrations of these compounds were among the highest observed so far in studies of methane seep environments. The δ-13C values of these lipids (δ-13C = -89 to -58%) indicate an origin from anaerobic methanotrophic archaea. This molecular-isotopic signature was found not only in samples that yielded predominantly ANME-2 clones but also in samples that yielded exclusively ANME-1 clones. ANME-1 archaea therefore remain strong candidates for mediation of the anaerobic oxidation of methane. Based on 16S rRNA data, the Guaymas sediments harbor phylogenetically diverse bacterial populations, which show considerable overlap with bacterial populations of geothermal habitats and natural or anthropogenic hydrocarbon-rich sites. Consistent with earlier observations, our combined evidence from bacterial phylogeny and molecular-isotopic data indicates an important role of some novel deeply branching bacteria in anaerobic methanotrophy. Anaerobic methane oxidation likely represents a significant and widely occurring process in the trophic ecology of methane-rich hydrothermal vents. This study stresses a high diversity among communities capable of anaerobic oxidation of methane.
    Description
    Author Posting. © American Society for Microbiology, 2002. This article is posted here by permission of American Society for Microbiology for personal use, not for redistribution. The definitive version was published in Applied and Environmental Microbiology 68 (2002): 1994-2007, doi:10.1128/AEM.68.4.1994-2007.2002.
    Collections
    • Josephine Bay Paul Center in Comparative Molecular Biology and Evolution
    • Geology and Geophysics (G&G)
    • Biology
    Suggested Citation
    Applied and Environmental Microbiology 68 (2002): 1994-2007
     

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