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. 2015 Oct 22;8:172. doi: 10.1186/s13068-015-0348-2

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© Xia et al. 2015

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Principal coordinate analysis (PCoA) plots depict Bray–Curtis distance between sludge samples using CAG content (a) and phylogeny distribution based on 16S rRNA genes (b) or based on CAG-encoding ORFs (c). Significance Bray–Curtis distance between groups is indicated by p value (analysis of similarity, ANOSIM). Eclipse is drawn with confidence limit of 0.68. Samples are, respectively, colored according to environmental categories of DO (anaerobic and aerobic), temperature (M mesophilic; A ambient temperature; T thermophilic) and salinity (saline and fresh) in the left, middle and right subfigures