Metabolic phases and community dynamics. (a) Metabolic phases of the anaerobic fermentation shown by gas production and the formation of metabolites in column A. The transition phases from phases 1 to 2 and from phases 2 to 3 are displayed by gray bars indicating the gradual adjustment of the metabolism. (b) Community dynamics in column A shown by T-RFLP profiles of bacterial 16 S rRNA amplicons. Only T-RFs with a relative abundance of minimum 2% are shown. Msp I was used as the restriction enzyme.