Complex dynamics of a Holling-type IV predator-prey model

In this paper, we focus on a spatial Holling-type IV predator-prey model which contains some important factors, such as diffusion, noise (random fluctuations) and external periodic forcing. By a brief stability and bifurcation analysis, we arrive at the Hopf and Turing bifurcation surface and derive the symbolic conditions for Hopf and Turing bifurcation in the spatial domain. Based on the stability and bifurcation analysis, we obtain spiral pattern formation via numerical simulation. Additionally, we study the model with colored noise and external periodic forcing. From the numerical results, we know that noise or external periodic forcing can induce instability and enhance the oscillation of the species, and resonant response. Our results show that modeling by reactiondiffusion equations is an appropriate tool for investigating fundamental mechanisms of complex spatiotemporal dynamics. PACS numbers: 87.23.Cc, 82.40.Ck, 05.40.Ca, 47.54.-r