Table 2.

Relative abundance of the top eight classes (%). The data are expressed as mean ± SEM. “*” and “**” indicate significance at “p < 0.05 and p < 0.01”, respectively when compared with the S group

Class	Phylum	S	D	Z	G
Bacteroidia	Bacteroidetes	0.817 ± 0.005	0.752 ± 0.002**	0.835 ± 0.002**	0.686 ± 0.005**
Clostridia	Firmicutes	0.155 ± 0.004	0.21 ± 0.004**	0.132 ± 0.004**	0.26 ± 0.005**
Epsilonproteobacteria	Proteobacteria	0.012 ± 0.000	0.009 ± 0.001**	0.006 ± 0.001**	0.035 ± 0.001**
Betaproteobacteria	Proteobacteria	0.003 ± 0.0006	0.011 ± 0.000**	0.008 ± 0.0006**	0.003 ± 0.0006**
Deltaproteobacteria	Proteobacteria	0.005 ± 0.0006	0.006 ± 0.000**	0.004 ± 0.0006**	0.008 ± 0.0006**
Verrucomicrobiae	Verrucomicrobia	0.003 ± 0.000	0.002 ± 0.000**	0.007 ± 0.0006**	0.000 ± 0.0000**
Deferribacteres	Deferribacteres	0.001 ± 0.000	0.002 ± 0.000**	0.001 ± 0.0006**	0.004 ± 0.0006**
Bacilli	Firmicutes	0.001 ± 0.000	0.002 ± 0.000**	0.004 ± 0.001**	0.001 ± 0.000**