Adaptive Evolution of Virulence-Related Traits in a Susceptible-Infected Model with Treatment
Figure 4
The coexistence plots are depicted, two strains are presented on separate axes and the gray areas define combinations of strains that are mutually invasible and the corresponding evolutionary branching. Shaded areas indicating protected dimorphism are separated by stable (black) and unstable (red) isoclines at which selection gradient vanishes in either -direction or -direction. Red bullet = initial branching point, black bullet = evolutionarily stable singularity, black bullet () = stable singular coalition, and . “” = repeller point. Correspondingly, below the coexistence plots we simulate evolutionary trees with branching patterns. (a) and (d) ; (b) and (e) ; (c) and (f) . Other parameter values are , , , .
