Relative abundances of the SOR COGs and COG0580 in stenohaline MAGs. All R -squared values and p values fall within the 95% confidence intervals from bootstrap tests (solid blue dots). Number of MAGs involved in statistical calculations: low-salinity category, n = 33; intermediate-salinity category, n = 36; high-salinity category, n = 44. The crosses in the figures indicate the mean relative abundances. Statistical significance symbols: **** p <= 0.0001, *** p <= 0.001, ** p <= 0.01, * p <= 0.05, ns p > 0.05 (Kruskal–Wallis rank-sum test with Dunn’s multiple comparison test). Source data are provided in Additional file 2 : Supplementary Table S10
