Relative abundance of OTUs.

Abstract

<p>For each OTU, the relative abundance is plotted for each sample in which the OTU is present. The OTUs with the highest number of total sequences are ranked first and plotted at the leftmost side, and the OTUs with the lowest total number of sequences are ranked last and plotted toward the right. <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0034242#pone-0034242-g003" target="_blank">Figure 3A</a> shows the V1–V3 OTUs and <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0034242#pone-0034242-g003" target="_blank">Figure 3B</a> the V3–V5 OTUs. Even OTUs that are among the top 10 most abundant span at least 3 orders of magnitude of relative abundances from less than 0.01% to more than 10%.</p