Table 2. Regression between half-life of pyrene and relative abundances and diversities of bacterial phyla and class.

Half-life of pyrene correlated inversely with relative abundance of Beta-, Delta- and Gammaproteobacteria, and directly with the relative abundance of Actinobacteria and Alphaproteobacteria. In addition, regression was found between lower half-life of pyrene and higher diversity of Bacteroidetes and Betaproteobacteria.

	df	F	R	r2	t	p-value
Abundance
Actinobacteria	13	9	0.64	0.41	3.0	0.010
Alphaproteobacteria	13	12	0.69	0.48	3.5	0.004
Betaproteobacteria	13	7	0.60	0.36	−2.7	0.018
Deltaproteobacteria	13	10	0.67	0.44	−3.2	0.007
Gammaproteobacteria	13	6	0.57	0.32	−2.5	0.027
Diversity
Bacteroidetes	13	18	0.76	0.58	−4.3	0.001
Betaproteobacteria	13	7	0.60	0.36	−2.7	0.018

Notes.

r²

Coefficient of Determination

df

Degree of Freedom

R

Correlation Coefficient

t

t-test statistic