Figure 2From: Noise-induced transitions in an avian influenza model with the Allee effectThe plots are the global phase portraits of the avian system (2.1) with respect to \(\frac{\mu _{a}+\delta _{a}}{\beta _{a}}\). (a) \(M_{a}=5000\); (b) \(M_{a}=6100\); (c) \(M_{a}=6300\); (d) \(M_{a}=6500\)Back to article page