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. 2015 Dec 22;6:1457. doi: 10.3389/fmicb.2015.01457

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Copyright © 2015 Ben Maamar, Aquilina, Quaiser, Pauwels, Michon-Coudouel, Vergnaud-Ayraud, Labasque, Roques, Abbott and Dufresne.

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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Principal component analysis (PCA) plot of hydrogeochemical data measured in groundwater from three hard-rock aquifers. The first and second principal components (PC1 and PC2) account for 27 and 17% of variance, respectively. The plot includes groundwater samples from all wells, including P-O and SB-O which were not used in the microbial diversity analysis. Recent groundwater samples are represented by closed symbols and old groundwater samples by open symbols. Abbreviations : B-R, Betton-Recent; P-R1, Ploemeur-Recent 1; P-R2, Ploemeur-Recent 2; P-O, Ploemeur-Old; SB-O, Saint-Brice-Old; SB-O1, Saint-Brice-Old 1; SB-O2, Saint-Brice-Old 2; B-O, Betton-Old; T, temperature.