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Extremophiles

, Volume 5, Issue 6, pp 385–392 | Cite as

Archaeology of Archaea: geomicrobiological record of Pleistocene thermal events concealed in a deep-sea subseafloor environment

  • Fumio Inagaki
  • Ken Takai
  • Tetsushi Komatsu
  • Toshiya Kanamatsu
  • Kantaro Fujioka
  • Koki Horikoshi
Original Paper

Abstract.

A record of the history of the Earth is hidden in the Earth's crust, like the annual rings of an old tree. From very limited records retrieved from deep underground, one can infer the geographical, geological, and biological events that occurred throughout Earth's history. Here we report the discovery of vertically shifted community structures of Archaea in a typical oceanic subseafloor core sample (1410 cm long) recovered from the West Philippine Basin at a depth of 5719 m. Beneath a surface community of ubiquitous deep-sea archaea (marine crenarchaeotic group I; MGI), an unusual archaeal community consisting of extremophilic archaea, such as extreme halophiles and hyperthermophiles, was present. These organisms could not be cultivated, and may be microbial relicts more than 2 million years old. Our discovery of archaeal rDNA in this core sample, probably associated with the past terrestrial volcanic and submarine hydrothermal activities surrounding the West Philippine Basin, serves as potential geomicrobiological evidence reflecting novel records of geologic thermal events in the Pleistocene period concealed in the deep-sea subseafloor.

Subseafloor environment Pleistocene Archaea 16S rDNA T-RFLP DGGE 

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Copyright information

© Springer-Verlag 2001

Authors and Affiliations

  • Fumio Inagaki
    • 1
  • Ken Takai
    • 1
  • Tetsushi Komatsu
    • 1
  • Toshiya Kanamatsu
    • 2
  • Kantaro Fujioka
    • 1
  • Koki Horikoshi
    • 1
  1. 1.Subground Animalcule Retrieval (SUGAR) Project, Frontier Research System for Extremophiles, Japan Marine Science and Technology Center (JAMSTEC), Yokosuka 237-0061, Japan
  2. 2.Deep-sea Research Department, Japan Marine Science and Technology Center (JAMSTEC), Yokosuka, Japan

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