Fig. 7.

Survival curves for invasions by a single IS element under different scenarios. Left and middle: Unregulated transposition activity (red) and that with evolving regulation (black) both occur at the same time as the IS element enters the population. We compare them with the case of constant transposition rates (blue). Unregulated transposition activities, regardless of further regulation and mechanism of mutations (non-reversible vs. reversible), do not affect the survival of a single IS element. Right: The strength of selection does not influence the survival of ISs. Each curve was calculated based on 10,000 simulation runs, and each simulation was run for 30,000 generations. Blue and grey: δ=0, γ=0, N=10⁴ (dark grey) and 10⁶ (light grey). Red: γ=0. Other parameter values are as given in Table 1