Limit cycles and Hopf bifurcations in a Kolmogorov type system

Abstract
The paper is devoted to the study of a class of Kolmogorov type systems which can be used to represent the dynamic behaviour of prey and predators. The model is an extension of the classical prey-predator model since it allows intraspecific competition for the predator''s species. The analysis shows that the system can only have Kolmogorov''s two modes of behaviour: a globally stable equilibrium or a globally stable limit cycle. Moreover, the transition from one of these two modes to the other is a non-catastrophic Hopf bifurcation which can easily be specified analytically.

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