Endolithic bacterial rDNA components associated with the mid-Cretaceous Oceanic Anoxic Event (OAE)

Details Endolithic bacterial rDNA components associated with the mid-Cretaceous Oceanic Anoxic Event (OAE) Endolithic bacterial rDNA components associated with the mid-Cretaceous Oceanic Anoxic Event (OAE)

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja....13653n&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #13653

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While it was not possible to obtain viable cultures from any samples tested, we were successful in the isolation and sequencing of bacterial rDNAs from endolithic from Cretacious-age black shales (˜ 100 million years old) in southeastern France. Sequences rDNA isolated from this endolithic habitat demonstrated that the marine gamma-proteobacterial rDNA were predominant bacterial components and that the community structures were lithostratigraphically shifted to sulfate reducing bacteria within delta-Proteobacteria at the black layer of the OAE (ocean anoxic event). On the basis of molecular ecological and paleontrogical studies, the endolithic rDNAs were presumably ancient buried relics. To stimulate discussion of this process, we have called this collection of sequences the "Paleobe", asking the question of whether it preserves the past biological record for geologic time scale through the sedimentation process. Here we also discuss the progress of the study of "Paleobe" for better understanding of the history of life and past environments on Earth and other planet, as well as the robustness of living organisms and their genetic signatures.

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