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Depth profiles of microbial richness in oxic marine sediment and anoxic marine sediment. (A–C) Archaeal (ARC), bacterial (BAC), and universal (UNI) ASV richness (Chao-1 estimator), calculated using data rarified to 1,000 reads per sample. Small, pale points represent the 100 resamplings per sample, and large points represent the mean values of the resamplings.
