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Epsilonproteobacteria dominate bacterial diversity at a natural tar seep.
Comptes Rendus Biologies 2017 April
The bacterial diversity of a naturally seeping bitumen source was investigated by 16S rRNA gene cloning and sequencing. Epsilonproteobacteria were shown to dominate the bacterial diversity in the underground water and within the bitumen, representing ca. 75% of the total bacterial diversity. These Epsilonproteobacteria were dominated by Sulfurimonas OTUs, while Sulfurovum and Arcobacter OTUs completed the remaining diversity. Epsilonproteobacteria are sulfur-oxidizer, nitrate-reducing chemo-lithoautotrophic bacteria, unable to use most organics for growth but capable of CO2 fixation. Thus, reduced sulfur species, but not the complex organic matter of the tar, are utilized for growth by bacterial communities at the Puy-de-la-Poix. The large prevalence of populations of Epsilonproteobacteria is a clear indication that crude oil offers a competitive ecological niche for these organisms.
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