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A cryptoendolithic community in volcanic glass.

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Area of Science:

  • Astrobiology
  • Geomicrobiology
  • Extremophile Research

Background:

  • Terrestrial volcanic environments present extreme conditions for life.
  • Silica-rich volcanic glass (obsidian) offers a unique habitat for microbial colonization.
  • Understanding microbial life in such environments informs the search for extraterrestrial life.

Purpose of the Study:

  • To characterize endolithic microbial communities in Icelandic volcanic glass.
  • To investigate the colonization limits of phototrophs in opaque rock.
  • To assess the potential for volcanic rocks as early Earth microhabitats.

Main Methods:

  • Fluorescence in situ hybridization (FISH) for visualizing microorganisms.
  • 16S ribosomal DNA (rDNA) sequencing for microbial identification.
  • Analysis of endolithic colonization in obsidian from a volcanic region.

Main Results:

  • Diverse eubacterial assemblages were found colonizing the obsidian interior.
  • Cyanobacterial and algal sequences were identified, with phototrophs visualized by FISH.
  • Phototrophs were detected at depths limited by photosynthetically active radiation (PAR) penetration.

Conclusions:

  • Molecular methods can characterize phototrophs at the edge of PAR.
  • Volcanic rocks provide shielded microhabitats, protecting from UV radiation and extreme temperatures.
  • Pioneer phototrophs can colonize opaque volcanic glasses, suggesting similar habitats existed on early Earth.