Figure 1

A) Rate of adaptation to a novel 8-task environment as a function of mutation rate, for fragile F (white) and robust R (black) genotypes. Adaptation was measured as the difference in log fitness of the evolved and ancestral organisms. Fitness was first averaged over all organisms in a population, then log transformed, then averaged over the 50 replicate lineages for each mutation rate. Bars represent standard errors of the mean. B) and C) Fitness trajectories for lineages evolved from F (red) and R (blue)for two different mutation rates and timescales.