Figure 4

For model (5.2) with fixed parameters given in (5.1), (a) and (b) bifurcation diagram and largest Lyapunov exponent for \(\delta _{2}=0.3\) and \(0<\rho <6\), respectively; (c) two-parameter bifurcation diagram in \(\delta _{2}\) and ρ space; (d) and (e) bifurcation diagram and the largest Lyapunov exponent for \(\delta _{2}=0.3\) and \(0<\rho <6\), respectively; (f) two-parameter bifurcation diagram in ρ and ν space