highly significantP ≤ 9.79 × 10 −7
At the genus level ( Supplementary Figure S3A ), the α-diversity pattern mirrored that of the species level, with all indices showing highly significant overall intergroup differences (Kruskal-Wallis test: all χ 2 ≥ 27.674, P ≤ 9.79 × 10 −7 ).