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The number of samples in which taxa were observed plotted against mean taxa abundance (log10 scale) in untreated sample (A), and PMA-treated sample (B), conditions [(A: r2 = 0.58; P = <0.001), (B: r2 = 0.72; P = < 0.001)]. Common taxa (>75% sample occupancy) are plotted square, rare samples (<75% sample occupancy) are plotted circle.
