TABLE 1

Correlation coefficients (Spearman’s rho) between prokaryotic abundance, diversity, and composition with environmental factorsa

Parameter or phylumCorrelation coefficient (ρ)
pHSalinityMATMAPAmmoniaNitriteNitrateTOCTN
Microbial abundance−0.250.250.370.45*0.53***−0.22−0.160.56***0.45*
Alpha diversity (Shannon index)−0.17−0.21−0.10.390.10.230.11−0.1−0.01
Alphaproteobacteria−0.2−0.03−0.12−0.49***00.040.18−0.17−0.46*
Betaproteobacteria−0.62***−0.39−0.130.66***0.250.23−0.160.210.17
Deltaproteobacteria−0.52***0.340.31−0.240.18−0.43*0.10.420.07
Epsilonproteobacteria0.180.320.27−0.210.04−0.39−0.010.05−0.08
Gammaproteobacteria0.22−0.33−0.46*−0.43*−0.250.220.33−0.62***−0.48***
Chloroflexi−0.350.180.320.5***0.25−0.06−0.44*0.64***0.5***
Bacteroidetes−0.280.10.1−0.180.19−0.290.38−0.01−0.02
Planctomycetes0.34−0.43*−0.45*0.13−0.210.53***−0.1−0.39−0.08
Acidobacteria−0.26−0.23−0.27−0.44*−0.180.110.26−0.25−0.33
Euryarchaeota0.40.210.20.27−0.05−0.04−0.160.150.33
Gemmatimonadetes−0.03−0.29−0.37−0.39−0.140.320.12−0.38−0.5***
Bathyarchaeota0.250.30.390.21−0.05−0.26−0.080.140.15
Nitrospirae−0.27−0.41−0.360.03−0.330.170.06−0.15−0.16
Thaumarchaeota0.05−0.59***−0.67***−0.2−0.370.44*0.31−0.57***−0.36
WS3−0.360.030−0.45*0.02−0.080.11−0.03−0.34
Verrucomicrobia−0.64***−0.4−0.230.30.110.070.260.010.08
Cyanobacteria0.05−0.38−0.41−0.02−0.120.360.3−0.47***−0.2
  • a MAT, mean annual temperature; MAP, mean annual precipitation; TOC, total organic carbon; TN, total nitrogen. *, P <0.05; **, P <0.01; ***, P <0.001.