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    Insights into foraminiferal influences on microfabrics of microbialites at Highborne Cay, Bahamas

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    Date
    2013-03-15
    Author
    Bernhard, Joan M.  Concept link
    Edgcomb, Virginia P.  Concept link
    Visscher, Pieter T.  Concept link
    McIntyre-Wressnig, Anna  Concept link
    Summons, Roger E.  Concept link
    Bouxsein, Mary L.  Concept link
    Louis, Leeann  Concept link
    Jeglinski, Marleen  Concept link
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    Citable URI
    https://hdl.handle.net/1912/5949
    As published
    https://doi.org/10.1073/pnas.1221721110
    Abstract
    Microbialites, which are organosedimentary structures formed by microbial communities through binding and trapping and/or in situ precipitation, have a wide array of distinctive morphologies and long geologic record. The origin of morphological variability is hotly debated; elucidating the cause or causes of microfabric differences could provide insights into ecosystem functioning and biogeochemistry during much of Earth’s history. Although rare today, morphologically distinct, co-occurring extant microbialites provide the opportunity to examine and compare microbial communities that may be responsible for establishing and modifying microbialite microfabrics. Highborne Cay, Bahamas, has extant laminated (i.e., stromatolites) and clotted (i.e., thrombolites) marine microbialites in close proximity, allowing focused questions about how community composition relates to physical attributes. Considerable knowledge exists about prokaryotic composition of microbialite mats (i.e., stromatolitic and thrombolitic mats) but little is known about their eukaryotic communities, especially regarding heterotrophic taxa. Thus, the heterotrophic eukaryotic communities of Highborne stromatolites and thrombolites were studied. Here, we show that diverse foraminiferal communities inhabit microbialite mat surfaces and subsurfaces, thecate foraminifera are relatively abundant in all microbialite types, especially thrombolitic mats, foraminifera stabilize grains in mats, and thecate reticulopod activities can impact stromatolitic mat lamination. Accordingly, and in light of foraminiferal impacts on modern microbialites, our results indicate that the microbialite fossil record may reflect the impact of the radiation of these protists.
    Description
    Author Posting. © The Author(s), 2013. 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 of the United States of America 110 (2013): 9830-9834, doi:10.1073/pnas.1221721110.
    Collections
    • Geology and Geophysics (G&G)
    Suggested Citation
    Preprint: Bernhard, Joan M., Edgcomb, Virginia P., Visscher, Pieter T., McIntyre-Wressnig, Anna, Summons, Roger E., Bouxsein, Mary L., Louis, Leeann, Jeglinski, Marleen, "Insights into foraminiferal influences on microfabrics of microbialites at Highborne Cay, Bahamas", 2013-03-15, https://doi.org/10.1073/pnas.1221721110, https://hdl.handle.net/1912/5949
     
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