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. 2016 Feb 3;6:1533. doi: 10.3389/fmicb.2015.01533

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Copyright © 2016 Warren, Kendra, Brady and Slater.

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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(A) UniFrac cluster analysis illustrating the similarities between bacterial communities with depth. (B) Microbial community composition with depth in CT deposit as a function of principal components 1 (PC1) and 2 (PC2). Axis labels refer to the principal components and the total percentage of variance explained by each component. Text boxes identify correlated environmental characteristics associated with microbial community composition: ORP and conductivity (weakly negatively correlated with PC1, p < 0.1) and organic C (negatively correlated with PC2, p < 0.05). Highlighted clusters correspond with zones of observed porewater [∑H₂S] and [Fe²⁺].