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    Geomicrobiology of the ocean crust : the phylogenetic diversity, abundance, and distribution of microbial communities inhabiting basalt and implications for rock alteration processes

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    Santelli_Thesis (3.311Mb)
    Date
    2007-06
    Author
    Santelli, Cara M.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/1735
    Location
    9°N
    East Pacific Rise
    DOI
    10.1575/1912/1735
    Keyword
     Sediments; Biogeochemical cycles; Microbiology; Atlantis (Ship : 1996-) Cruise AT11-7; Atlantis (Ship : 1996-) Cruise AT11-20 
    Abstract
    Basaltic ocean crust has the potential to host one of the largest endolithic communities on Earth. This portion of the biosphere, however, remains largely unexplored. In this study, we utilize molecular biological, microscopic, and geochemical tools to gain a better understanding of the geomicrobiology of the ocean crust. Specifically, we examine the phylogenetic diversity of microorganisms inhabiting basaltic lavas, the activities and abundances of these microorganisms, the spatial extent of the biosphere, and the potential effect that microbial activity has on the geochemistry of the ocean crust and overlying water column. Our study demonstrates that young, fresh volcanic lavas near mid-ocean ridges host an incredibly diverse and dense population of microorganisms dominated by Bacteria, quite distinct from the microbial communities found in surrounding deep seawater and hydrothermal vents. Furthermore, these communities may contribute to the elemental cycling of Fe, S, Mn, N, and C in this environment. The inability to definitively identify microorganisms in drill-cores of old (> 15 Ma) ocean crust, however, implies that these once prolific communities may become scarce as the crust ages and moves further away from the ridge axis. Finally, we provide evidence suggesting that these communities are fueled by oxidative alteration reactions occurring in the basaltic crust.
    Description
    Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution June 2007
    Collections
    • WHOI Theses
    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Thesis: Santelli, Cara M., "Geomicrobiology of the ocean crust : the phylogenetic diversity, abundance, and distribution of microbial communities inhabiting basalt and implications for rock alteration processes", 2007-06, DOI:10.1575/1912/1735, https://hdl.handle.net/1912/1735
     

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