The distribution of microbial taxa in the subsurface water of the kalahari shield, south africa

T. M. Gihring, D. P. Moser, L. H. Lin, M. Davidson, Tullis C. Onstott, L. Morgan, M. Milleson, T. L. Kieft, E. Trimarco, D. L. Balkwill, M. E. Dollhopf

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104 Scopus citations


Microbial communities within deep subsurface environments were analyzed by 16S rRNA gene cloning. Clone libraries from 27 borehole fluid, 7 mining-contaminated, and 5 rock samples were compared. Borehole fluids derived from deep fractures were populated by microbial communities with low diversity with an average of 11 and 5 bacterial and archaeal OUT srespectively. Lowtaxa richness was likely driven by limited biogeochemical reactions available for growth and not extreme parameters such as pH and tempera-ture. Novel taxa of Firmicutes were discovered, commonly found in warm, slightly alkaline, anoxic fracture fluids. Highly divergent lineages of Archaea, unique to South African deep subsurface fracture fluids, are also described. Clone library clustering analyses based on LIBSHUFF phylogenetic relatedness revealed distinct groups of samples corresponding with sample source and geochemistry.

Original languageEnglish (US)
Pages (from-to)415-430
Number of pages16
JournalGeomicrobiology Journal
Issue number6
StatePublished - 2006

All Science Journal Classification (ASJC) codes

  • General Environmental Science
  • Microbiology
  • Earth and Planetary Sciences (miscellaneous)
  • Environmental Chemistry


  • 16S rRNAgene
  • Firmicutes
  • Groundwater
  • Microbial ecology
  • Subsurface


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