Co-existence of a Period Annulus and a Limit Cycle in a Class of Predator-Prey Models with Group Defense
R.E. Kooij (TU Delft - Network Architectures and Services)
André Zegeling (Guilin University of Aerospace Technology)
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Abstract
For a family of two-dimensional predator-prey models of Gause type, we investigate the simultaneous occurrence of a center singularity and a limit cycle. The family is characterized by the fact that the functional response is nonanalytical and ehibits group defense. We prove the eistence and uniqueness of the limit cycle using a new theorem for Liénard systems. The new theorem gives conditions for the uniqueness of a limit cycle which surrounds a period annulus. The results of this paper provide a mechanism for studying the global behavior of solutions to Gause systems through bifurcation of an integrable system which contains a center and a limit cycle.