MICROBIAL SURVIVAL: The Paleome: A Sedimentary Genetic Record of Past Microbial Communities

Details MICROBIAL SURVIVAL: The Paleome: A Sedimentary Genetic Record of Past Microbial Communities MICROBIAL SURVIVAL: The Paleome: A Sedimentary Genetic Record of Past Microbial Communities

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005asbio...5..141i&link_type=abstract

Astrobiology, Volume 5, Issue 2, pp. 141-153.

Biology

6

16S Rrna Gene, Biosignatures, Cretaceous, Oceanic Anoxic Events, Paleome

Scientific paper

Molecular genetic methods were used to analyze the remnants of microbial ecosystems contained within an ancient oceanic microbial habitat that was recovered from a continental drilled core of black shale ~100 million years in age. Bacterial ribosomal RNA genes were vertically amplified from the six different depths of a black shale core associated with a phosphate- rich stratum, defined as one of the mid-Cretaceous oceanic anoxic events (OAEs). Although the black shale core was recovered from a terrestrial coring effort, the recovered 16S rRNA gene sequences showed affinity to microbial communities previously seen in deep-sea sedimentary environments (i.e., the microbial assemblage was easily recognizable as a marine community). In particular, a number of 16S rRNA gene clones of oceanic sulfate-reducing bacteria within the δ-Proteobacteria predominated at the OAE layer. The recovered bacterial DNA signatures are consistent with the interpretation that the sequences are derived from the past microbial communities buried in either sea-bottom or subseafloor environments during the sedimentation process and, after ceasing growth, preserved until the present.

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