FIG 6.

Potential presence of different pathways of the main steps of humic acids’ degradation in the genera that abundance correlated with humic FDOM. Spearman correlation between the relative abundances of humic FDOM and bacterial genera are plotted on a heat map from least to most correlated (left to right, respectively). Polynucleobacter is the genus showing the highest correlation to humic FDOM concentration, followed by Methylobacterium and Acinetobacter. The complete list of pathways that were screened for in the functional repertory can be found in Table S3; however, only the pathways that were found in at least one genus are represented in the heat map for ease of viewing. FDOM, fluorescent dissolved organic matter.