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The Mothur program (version 1.41.1; University of Michigan; http://www.mothur.org/wiki/; Schloss et al., 2009) was used to analyze the bacterial richness (operational taxonomic unit; OTU, Chao1, and abundance-based coverage estimator; ACE) and diversity (Shannon, Simpson, and Heip) indices. *significant difference at P < 0.05.
