Figure 3.

Disentangling the effects of adaptation, chance and history in the evolution and diversification of TEV experimental populations evolved in Arabidopsis thaliana Ler-0. (a) Derived versus ancestral values for mean fitness in 25 experimental TEV populations after five serial passages in A. thaliana Ler-0 plants. The red line corresponds to the hypothesis of fitness differences only explained by historical effects with no contribution of chance and adaptation. Each genotype is represented by different symbols (legend). (b) Relative contributions of adaptation, chance, and history to mean fitness evolution. Error bars represent ±1 s.d. (Online version in colour.)