Table 2 Pearson’s correlation coefficient relating to phenanthrene and the relative abundance of bacterial groups at class and genus level, respectively

Class

Gamma-proteobacteria

30

r² = − 0.81, p < 0.01

Alpha-proteobacteria

15

r² = − 0.74, p < 0.01

Sphingobacteria

25

r² = − 0.56, p < 0.05

Actinobacter

20

r² = − 0.52, p < 0.05

Gemmatimonadetes

12

r² = − 0.61, p < 0.05

Flavobacteria

7

r² = − 0.581, p < 0.05

Cytophagia

7

r² = − 0.54, p < 0.05

Genera

Sphingomonas

34.7

r² = − 0.68, p < 0.05

Luteimonas

24.63

r² = − 0.87, p < 0.01

Rhodanobacter

21.34

r² = − 0.75, p < 0.01

Gemmatimonas

15.65

r² = − 0.63, p < 0.05

Pseudomonas

9.8

r² = − 0.93, p < 0.01

Flavobacterium

9.43

r² = − 0.54, p < 0.05

Leifsonia

8.98

r² = − 0.56, p < 0.05