Figure 2

OTU picking, taxonomic assignment and microbial diversity. Length distribution of clean tags is first shown (A). The constructed OTUs show differential sample size that is defined as the number of samples sharing an OTU (B) and absolute abundance of tag (C). All OTUs are counted according to taxonomic assignments at different levels (D), among which the phylum-level composition is demonstrated (E). Finally, six indices in relation to richness and diversity of microbial community are schematically compared among the four groups with box and whiskers plot (F).