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. 2019 Jun 20;10:1407. doi: 10.3389/fmicb.2019.01407

FIGURE 8.

FIGURE 8

Scatter plot derived from principal component analysis (PCA) of Spearman rank correlation coefficients of selected hydrochemical parameters with relative abundances of the OTUs included in the network of Figure 7 (A) and biplot of the correlated hydrochemical parameters (B). To test for an effect of chemical parameters on the association of OTUs in the identified subclusters of the network, we performed pairwise correlations of relative abundances of each OTU with hydrochemical parameters and then subjected the resulting correlation coefficients of significant correlations to PCA. Correlation coefficients were calculated with relative abundances of OTUs from ten groundwater wells and one (H13, H14), two (H31) or six sampling time points per well (total n = 46). DO, dissolved oxygen; TIC, total inorganic carbon.