Stable Coexistence of Three Species in Competition

• Main Author: Carlsson, Linnéa
• Format: Others
• Language: English
• Published: Linköpings universitet, Matematiska institutionen 2009
• Subjects: ordinary differential equations; competing species; coexistence; asymptotic stability; Routh's criterion; Applied mathematics; Tillämpad matematik
• Online Access: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-18807

This report consider a system describing three competing species with populations x, y and z. Sufficient conditions for every positive equilibrium to be asymptotically stable have been found. First it is shown that conditions on the pairwise competitive interaction between the populations are needed. Actually, these conditions are equivalent to asymptotic stability for any two-dimensional competing system of the three species. It is also shown that these alone are not enough, and that a condition on the competitive interaction between all three populations is also needed. If all conditions are fulfilled, each population will survive on a long-term basis and there will be a stable coexistence.