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Microbial communities thrive in Trinidad and Tobago's Pitch Lake, a unique natural asphalt environment. These bacteria and archaea possess novel metabolic pathways for degrading hydrocarbons, offering insights into extreme environments.

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Area of Science:

  • Microbial Ecology
  • Biogeochemistry
  • Petroleum Science

Background:

  • Pitch Lake, Trinidad and Tobago, is a natural asphalt reservoir formed by petroleum seepage.
  • The asphalt residue is characterized by low water activity, recalcitrant carbon, and noxious compounds.
  • This extreme environment hosts a unique microbial community.

Purpose of the Study:

  • To investigate the microbial ecology and biogeochemistry of Pitch Lake.
  • To characterize the microbial diversity and metabolic potential within the asphalt matrix.
  • To establish Pitch Lake as a terrestrial analogue for extraterrestrial hydrocarbon environments.

Main Methods:

  • Geochemical analysis of the asphalt column.
  • Molecular taxonomic approaches (e.g., DNA sequencing) to identify microbial lineages.
  • Comparison with microbial communities from other hydrocarbon-rich environments.

Main Results:

  • An active microbial community (up to 10(7) cells/gram) of archaea and bacteria, including novel strains, inhabits Pitch Lake.
  • Diverse, novel microbial lineages with potential for anaerobic hydrocarbon degradation were identified.
  • Evidence for archaeal methane metabolism and anaerobic sulfur- and nitrite-oxidizing bacteria was found.
  • Microbial diversity is unique compared to other natural asphalt and petroleum environments.

Conclusions:

  • Pitch Lake harbors a unique and diverse microbial ecosystem adapted to extreme hydrocarbon conditions.
  • The identified microbial lineages possess significant potential for mediating hydrocarbon degradation.
  • Pitch Lake serves as a valuable terrestrial analogue for studying life in hydrocarbon-rich environments, including those on other celestial bodies like Titan.