Microbial community composition along a 50 000-year lacustrine sediment sequence.

Deep biosphere and allochthonous sources of DNA Overall, microbial populations displayed an apparent trend reflecting the receding activity and slow death of microorganisms (Vuillemin et al . 2016 ) with a net decrease in cell abundance with depth (Fig. 2 ) during which the Bathyarchaeota and Chloroflexi became more abundant in the 16S datasets (Figs 3 and 5 ).

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