Extinction and the global structure of positive equilibria in a ratio-dependent intraguild predation model
We study an intraguild predation model with ratio-dependent trophic interactions. We first derive sufficient conditions for consumer extinction, total extinction, and global convergence to biologically relevant boundary equilibria. We then turn to coexistence at equilibrium and introduce a biologically motivated coordinate transformation that reduces the positive-equilibrium problem to an explicitly parameterized one-dimensional curve. This reduction enables us to determine how the positive-equilibrium branch connects to boundary equilibria and to classify all of its admissible global geometries. We also discuss the stability of positive equilibria. Numerical examples suggest the presence of periodic and chaotic coexistence, as well as several forms of multiple attractors.