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Averages of scaled relative abundances of detected OTUs at the phylum level for both aCO2 and eCO2 samples. Data are presented as means ± standard errors, with 12 samples for each CO2 condition. Generally, each bar has two portions: the top part is for unique OTUs detected only at aCO2 or eCO2 and the bottom part for shared OTUs detected under both aCO2 and eCO2 conditions. *, P < 0.05; **, P < 0.01.
