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nMDS plots for the relative abundances of taxonomic similarities (A) and metabolic subsystem similarities (B). Sites were averaged for each atoll. The 2D stress values are 0.05 and 0.03 for the taxonomic and metabolic similarities, respectively. Dark gray circles indicate significant groupings from the SIMPROF analysis (Figs. S2 and S3; Bray–Curtis similarity, P < 0.01). Light gray circles cluster atolls with greatest similarity within each statistically significant group.
