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. 2017 Aug 10;8:1486. doi: 10.3389/fmicb.2017.01486

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Copyright © 2017 Kuang, Cadotte, Chen, Shu, Liu, Chen, Hua, Shu, Zhou and Huang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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The cross-validation results of normalized rank of node connectivity based on (A) OTUs, (B) GCps, and (C) KOs. The mean values of normalized rank of node connectivity under lower and higher pH were calculated using the data set of environmental group G1–G3 and G4–G6, respectively. Red lines show the best-fitted linear regression models, and the normalized ranks located within gray areas (OTUs: 50%; GCps: 76%; KOs: 79%) represent <20% of the difference between lower and higher pH conditions. D-values are the distances between normalized ranks of nodes and diagonal line. The D_mean (mean ± SD) were calculated based on the normalized ranks of 48, 2,501, and 2,129 nodes in OTUs, GCps, and KOs data sets, respectively.