Fig. 6

Relative abundances of the SOR COGs and COG0580. a–d Relative abundance trends of the SOR COGs and COG0580 at the metagenome level (R-squared values and p values shown in the plots). e–h 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