Figure 2.

Left panels: Evolutionary outcomes of relative virulence $v_{\mathrm{J}}^{\ast }/v_{\mathrm{A}}^{\ast }$, in which red color indicates $v_{\mathrm{J}}^{\ast }>v_{\mathrm{A}}^{\ast }$ and blue color indicates the opposite situation, $v_{\mathrm{J}}^{\ast }<v_{\mathrm{A}}^{\ast }$. Color scales used are the same in the three panels. Middle panels: densities of infected juveniles at equilibrium, $I_{\mathrm{J}}^{\ast }$. Right panels: densities of susceptible juveniles at equilibrium, $S_{\mathrm{J}}^{\ast }$. In each panel, abscissa: assortativity; ordinate: post‐maturation span θ_A; from (A) to (C): $m_{\mathrm{A}}=0.8,1.0,1.25$ as indicated; white zone: evolutionary suicide; dotted curve: $v_{\mathrm{J}}^{\ast }=v_{\mathrm{A}}^{\ast }$ (equal virulence); parameters: default values. Middle and right panel can clearly demonstrate that evolutionary suicide does occur in the white zone, as $I_{\mathrm{J}}^{\ast }$ is very small but $S_{\mathrm{J}}^{\ast }$ is not.