Fig. 4.

Three-dimensional depiction of the bistability property of the model {2.2–2.6} with ${\Psi }_L^i=0$ (i = {SS, RS, RR}) in the SS- vs. RS- vs. RR-genotype plane, for various initial conditions and parameter values chosen such that $\mathrm{m}\mathrm{a}\mathrm{x}\{{\mathcal{R}}_0^{SS},{\mathcal{R}}_0^{RR}\}<1$. (a) Solution trajectories for the case ${\mathcal{R}}_0^{SS}<{\mathcal{R}}_0^{RR}<1$. (b) Solution trajectories for the case ${\mathcal{R}}_0^{RR}<{\mathcal{R}}_0^{SS}<1$. (c) Solution trajectories for the case ${\mathcal{R}}_0^{SS}\approx {\mathcal{R}}_0^{RR}<1$. Notation: solution trajectories whose final state is the sensitive-only boundary equilibrium are shown in blue, while those whose final state is the resistant-only boundary equilibrium are shown in orange.