ON THE CODIMENSION-TWO AND -THREE BIFURCATIONS OF A FOOD WEB OF FOUR SPECIES

Abstract

This paper is concerned with codimension-two and -three bifurca- tions of a food web containing a bottom prey X, two competing predators Y and Z on X, and a super predator W only on Y . Parameter conditions for a part of codimension-two bifurcations and a codimension-three bifurcation are derived. Three-parameter bifurcation diagrams are computed using an adap- tive grid method to locate the bifurcations determined by the eigenvalues of equilibria.