Core microbial communities of lacustrine microbialites sampled along an alkalinity gradient
Résumé
Originality and Significance Statement Microbialites are rocks formed by microbial communities under particular physicochemical conditions. Although they are important as the oldest reliable life traces and for their capacity to sequester CO 2 as biomass and carbonates, the specific drivers influencing carbonatogenesis are not well understood. We compare the prokaryotic and eukaryotic communities associated to microbialites sampled in lakes of increasing alkalinity in the Trans-Mexican volcanic belt. We identify a conserved core microbial community populating microbialites that is more abundant in the most conspicuous microbialites, which occur in lakes with the highest alkalinity. This helps constraining microbialite formation conditions and opens interesting perspectives for the use of subsampled core communities for carbon sequestration experiments.
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