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Bacterioplankton OTU richness (a) and community equitability, as indicated by Pielou's evenness (b), along the pH gradient. OTU richness and Pielou's evenness showed quadratic (hump-shaped) relationships with pH; the OTU diversity and Pielou's evenness peaked in nearly neutral lakes and were lowest in the most acidic lakes. The formulas, R2 values, and significances are given in each panel.
