Ratio of anaerobic/aerobic generation times related to anaerobic generation times of IMPACT isolates (de Muinck et al. submitted). Circled strains are the ones for which we present genome sequences in this study. Blue circled strains are categorized as fast growers, green have a medium growth rate, and red circled strains are slow growing strains. R2 = 0.51, p < 0.0001.