Complex Dynamics of a Diffusive Holling-Tanner Predator-Prey Model with the Allee Effect

Figure 6

The phase portrait of model (7) with the weak Allee effect. The parameters are taken as 𝑎=0.8, 𝛿=1.5, 𝑚=0.75, and 𝑟=0.025. The positive equilibrium 𝐸^∗=(0.3232928050,0.4849392075) is an unstable focus surrounded by a stable limit cycle.