DOUBLE ZERO SINGULARITY AND SPATIOTEMPORAL PATTERNS IN A DIFFUSIVE PREDATOR-PREY MODEL WITH NONLOCAL PREY COMPETITION

A diffusive predator-prey model with nonlocal prey competition and the homogeneous Neumann boundary conditions is considered, to explore the effects of nonlocal reaction term. Firstly, conditions of the occurrence of Hopf, Turing, Turing-Turing and double zero bifurcations, are established. Then, several concise formulas of computing normal form at a double zero singularity for partial functional differential equations, are provided. Next, via analyzing normal form derived by utilizing these formulas, we find that diffusive predator-prey system admits interesting spatiotemporal dynamics near the double zero singularity, like tristable phenomenon that a stable spatially inhomogeneous periodic solution with the shape of cos omega(0)tcos I/t-like which is unstable in model without nonlocal competition and also greatly different from these with the shape of cos omega(0)t + cos x/t-like resulting from Turing-Hopf bifurcation, coexists with a pair of spatially inhomogeneous steady states with the shape of cos x/t-like. At last, numerical simulations are shown to support theory analysis. These investigations indicate that nonlocal reaction term could stabilize spatially inhomogeneous periodic solutions with the shape of cos omega(0)tcos kx/t-like for reaction-diffusion systems subject to the homogeneous Neumann boundary conditions.