Figure 1.

Sequential trait evolution when the VT efficacy ξ is fixed. (a) Evolutionary attractors λ* when q = 0. (b) Evolutionary endpoints q* provided that the bacterium has the HT rate λ*; the transition zone between q* = 0 and q* = 1 is formed by evolutionary branching points. (c) Simulation of evolutionary branching of an originally non-MK bacterium transmitted horizontally at λ*. (d) Evolutionary endpoints q* provided that the bacterium has the HT rate λ*. White colour = region of non-persistence (R₀ < 1). Parameters: (a–c) γ = 0.5, (c) ξ = 0.68, h = 0.52 and (d) h = 1. Common parameters: a₁ = 1, a₂ = 0.5, c = 3 and μ = b = 0.1. ESS: evolutionary singular strategy. (Online version in colour.)