Table 3. Mean relative abundance of phylotypes that were highly affected by the pH-switch in PolyFermS model A.

Higher taxonomic group	Phylotype	t1	t2	corrected p value
Bacteroidetes	Bacteroides fragilis et rel.	2.22	1.08*	0.037
	Bacteroides intestinalis et rel.	1.88	1.40*	0.022
	Bacteroides vulgatus et rel.	5.49	3.96*	0.022
	Tannerella et rel.	1.05	0.54*	0.012
Clostridium cluster XIVa	Clostridium nexile et rel.	2.30	3.26	0.060
	Eubacterium rectale et rel.	2.05	4.13	0.060
	Roseburia intestinalis et rel.	2.70	5.83	0.060
Proteobacteria	Proteus et rel.	0.02	0.08*	0.037
	Sutterella wadsworthia et rel.	3.36	1.89*	0.037

All values are given as mean relative abundances (%) of phylotypes based on HITChip analysis of reactor effluents obtained from all reactors of the PolyFermS model A before (t1, day 12/13; n = 5) and after (t2, day 21/22; n = 5) the pH-switch. A comprehensive overview of the most abundant phylotypes detected before and after the pH-switch is given in Table S3.

^*Means with an asterisk differ significantly (p<0.05) for the same phylotype before and after the pH-switch.