OTU distribution and relative sequence abundance of bacterial phyla and candidate divisions among the subsamples from subsurface peat.

<p>(A) Venn diagram showing the number of OTUs unique to a single subsample or shared by two, three, or all four subsamples. (B) Relative sequence abundance of bacterial phyla and candidate divisions based on OTUs that were detected either in all four subsamples (core OTUs) or only in a single subsample (unique OTUs). Phyla that were detected only in subsurface peat, but not in the surface layer, are marked by asterisks.