highly significantP <0.001
The deviation from equal proportion of Gammaproteobacteria and Betaproteobacteria was highly significant separately for the TYP (χ 2 = 45.33, df = 1, P <0.001), LON (χ 2 = 38.50, df = 1, P <0.001), and SHA form (χ 2 = 42.50, df = 1, P <0.001).