Average relative abundance and prevalence of OTUs determined using Pipelines 1 (A) and 6 (B).

<p>The top panel (of each figure) shows the relative abundance of each OTU averaged for the six samples processed with the same extraction method. Individual OTUs are ranked on the x-axis according to their average relative abundance in all (12) samples from high (left) to low (right). E, enzymatic lysis; M, mechanical lysis. Bottom panel indicates the number of samples (0–6) in which the corresponding OTU was found (prevalence). Green bars, enzymatic lysis; blue bars, mechanical lysis.