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Fractional coverage of metabolic functional groups within hgcA+ community. Fermentative organisms are the most abundant hgcA+ organisms in Lake Mendota. Coverage of each functional group has been normalized to the coverage of all hgcA+ bins in each metagenome. Plots of coverage in the different metagenomes are arranged by decreasing redox potential, which corresponds to increasing sulfide concentrations. Abbreviations: GHs - glucoside hydrolases, EET - external electron transfer.
