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Comparison of alpha-diversity metrics between the microbiota of three Mediterranean orchid species. Richness (observed OTUs), diversity (Shannon) and phylogenetic diversity (PD) for different orchid species (A–C) and organs (D–F). ° indicates outliers. Different letters above the bars indicate significantly different means (Tukey test, p < 0.05); no letters (panel F) indicate no statistically significant differences.
