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Invertebrate community indices from ambient, low, and extreme low pH zones for combined northern and southern sites (means ± SEM, n = 8). (A) Taxonomic richness (number of OTUs per 400 cm2), (B) evenness (Pielou’s J), (C) total number of individuals per 400 cm2, and (D) aggregate invertebrate biomass (grams per 400 cm2). Lowercase letters denote differences among pH zones.
