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Figure 3 | BMC Evolutionary Biology

Figure 3

From: Positive selection at high temperature reduces gene transcription in the bacteriophage ϕX174

Figure 3

Fitness differences between ancestor and promoter mutant strains at two temperatures for three bacterial hosts. Doublings per hour were measured for each phage strain in three bacterial hosts and at two temperatures. Bars are the mean and error bars the standard error of three replicate assays. Solid bars are mutant strains with non-synonymous substitutions in C, hatched bars are synonymous in C. Doublings per hour of the ancestor is significantly lower than at least one of the four mutant strains for all host/temperature combinations except E. coli and S. sonnei at 37°C, where the ancestor's fitness is significantly greater than at least one of the four mutant strains (Table 3).

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