title: Global hopf bifurcation on two-delays leslie-gower predator-prey system with a prey refuge.
abstract: A modified Leslie-Gower predator-prey system with two delays is investigated. By choosing τ 1 and τ 2 as bifurcation parameters, we show that the Hopf bifurcations occur when time delay crosses some critical values. Moreover, we derive the equation describing the flow on the center manifold; then we give the formula for determining the direction of the Hopf bifurcation and the stability of bifurcating periodic solutions. Numerical simulations are carried out to illustrate the theoretical results and chaotic behaviors are observed. Finally, using a global Hopf bifurcation theorem for functional differential equations, we show the global existence of the periodic solutions.
authors.affiliation: Department of Applied Mathematics, Kunming University of Science and Technology, Kunming, Yunnan 650500, China.
authors.forename: Qingsong
authors.initials: Q
authors.lastname: Liu
authors.affiliation: Department of Applied Mathematics, Kunming University of Science and Technology, Kunming, Yunnan 650500, China.
authors.forename: Yiping
authors.initials: Y
authors.lastname: Lin
authors.affiliation: School of Computer Science, Beijing University of Post Telecommunication, Beijing 100876, China.
authors.forename: Jingnan
authors.initials: J
authors.lastname: Cao
mesh_terms: D000465:Algorithms; D000818:Animals; D003198:Computer Simulation; D004463:Ecology; D008954:Models, Biological; D008962:Models, Theoretical; D011157:Population Dynamics; D011235:Predatory Behavior; D015203:Reproducibility of Results; D013997:Time Factors