Geomicrobiology of the ocean crust : the phylogenetic diversity, abundance, and distribution of microbial communities inhabiting basalt and implications for rock alteration processes
Santelli, Cara M.
MetadataShow full item record
East Pacific Rise
KeywordSediments; Biogeochemical cycles; Microbiology; Atlantis (Ship : 1996-) Cruise AT11-7; Atlantis (Ship : 1996-) Cruise AT11-20
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.
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
Suggested CitationThesis: 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
Showing items related by title, author, creator and subject.
Data report of oblique reflection-refraction radio-sonobuoy profiles on the African Atlantic continental margin : (R/V Atlantis II cruises 67 and 75) Hoskins, Hartley; Rogers, Carolyn U.; Woo, Aileen O. (Woods Hole Oceanographic Institution, 1974-06)Two hundred sixty-four unreversed oblique reflection-refraction profiles using expendable radio-sonobuoys were obtained during two geophysical cruises to the Atlantic continental margin of Africa. This data report gives ...
Spatial and temporal population genetics at deep-sea hydrothermal vents along the East Pacific Rise and Galápagos Rift Fusaro, Abigail Jean (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2008-09)Ecological processes at deep-sea hydrothermal vents on fast-spreading mid-ocean ridges are punctuated by frequent physical disturbance. Larval dispersal among disjunct vent sites facilitates the persistence of sessile ...
Preliminary cruise report ATLANTIS II - cruise 8 : International Indian Ocean Expedition, July 5, 1963 - December 20, 1963 Miller, Arthur R.; Risebrough, Robert W. (Woods Hole Oceanographic Institution, 1963)ATLANTIS II was delivered to the Woods Hole Oceanographic Institution on January 31, 1963. After some short cruises she left Woods Hole on July 5 to participate in the International Indian Ocean Expedition, her first ...