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    Archaea and bacteria with surprising microdiversity show shifts in dominance over 1,000-year time scales in hydrothermal chimneys

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    Date
    2009-12-06
    Author
    Brazelton, William J.  Concept link
    Ludwig, Kristin A.  Concept link
    Sogin, Mitchell L.  Concept link
    Andreishcheva, Ekaterina N.  Concept link
    Kelley, Deborah S.  Concept link
    Shen, Chuan-Chou  Concept link
    Edwards, R. Lawrence  Concept link
    Baross, John A.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/3146
    As published
    https://doi.org/10.1073/pnas.0905369107
    Abstract
    The Lost City Hydrothermal Field, an ultramafic-hosted system located 15 km west of the Mid-Atlantic Ridge, has experienced at least 30,000 years of hydrothermal activity. Previous studies have shown that its carbonate chimneys form by mixing of ~90ºC, pH 9-11 hydrothermal fluids and cold seawater. Flow of methane and hydrogen-rich hydrothermal fluids in the porous interior chimney walls supports archaeal biofilm communities dominated by a single phylotype of Methanosarcinales. In this study, we have extensively sampled the carbonate-hosted archaeal and bacterial communities by obtaining sequences of >200,000 amplicons of the 16S rRNA V6 region and correlated the results with isotopic (230Th) ages of the chimneys over a 1200 year period. Rare sequences in young chimneys were often more abundant in older chimneys, indicating that members of the rare biosphere can become dominant members of the ecosystem when environmental conditions change. These results suggest that a long history of selection over many cycles of chimney growth has resulted in numerous closely related species at Lost City, each of which is pre-adapted to a particular set of re-occurring environmental conditions. Due to the unique characteristics of the Lost City Hydrothermal Field, these data offer an unprecedented opportunity to study the dynamics of a microbial ecosystem's rare biosphere over a thousand-year time scale.
    Description
    Author Posting. © The Author(s), 2009. This is the author's version of the work. It is posted here by permission of National Academy of Sciences for personal use, not for redistribution. The definitive version was published in Proceedings of the National Academy of Sciences 107 (2010): 1612-1617, doi:10.1073/pnas.0905369107.
    Collections
    • Josephine Bay Paul Center in Comparative Molecular Biology and Evolution
    Suggested Citation
    Preprint: Brazelton, William J., Ludwig, Kristin A., Sogin, Mitchell L., Andreishcheva, Ekaterina N., Kelley, Deborah S., Shen, Chuan-Chou, Edwards, R. Lawrence, Baross, John A., "Archaea and bacteria with surprising microdiversity show shifts in dominance over 1,000-year time scales in hydrothermal chimneys", 2009-12-06, https://doi.org/10.1073/pnas.0905369107, https://hdl.handle.net/1912/3146
     
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