Relative abundance of bacterial genera in the thermophilic chemostats. The relative abundance was calculated based on 16S rRNA gene amplicon sequencing (DNA level). ATL chemostat, acetate-fed, dilution rate of 0.025 day−1; ATH chemostat, acetate-fed, dilution rate of 0.05 day−1; PTL chemostat, propionate-fed, dilution rate of 0.025 day−1; PTH chemostat, propionate-fed, dilution rate of 0.05 day−1; BTL chemostat, butyrate-fed, dilution rate of 0.025 day−1; BTH chemostat, butyrate-fed, dilution rate of 0.05 day−1; VTL chemostat, isovalerate-fed, dilution rate of 0.025 day−1; VTH chemostat, isovalerate-fed, dilution rate of 0.05 day−1.