A PDE model of intraguild predation with cross-diffusion

Abstract

This note concerns a quasilinear parabolic system modeling an intraguild predation community in a focal habitat in \begin{document}$\mathbb{R}^n$\end{document} , \begin{document}$n ≥ 2$\end{document} . In this system the intraguild prey employs a fitness-based dispersal strategy whereby the intraguild prey moves away from a locale when predation risk is high enough to render the locale undesirable for resource acquisition. The system modifies the model considered in Ryan and Cantrell (2015) by adding an element of mutual interference among predators to the functional response terms in the model, thereby switching from Holling Ⅱ forms to Beddington-DeAngelis forms. We show that the resulting system can be realized as a semi-dynamical system with a global attractor for any \begin{document}$n ≥ 2$\end{document} . In contrast, the orginal model was restricted to two dimensional spatial habitats. The permanance of the intraguild prey then follows as in Ryan and Cantrell by means of the Acyclicity Theorem of Persistence Theory.