Global Dynamics and Bifurcations Analysis of a Two-Dimensional Discrete-Time Lotka-Volterra Model

摘要

In this paper, global dynamics and bifurcations of a two-dimensional discrete-time Lotka-Volterra model have been studied in the closed first quadrant . It is proved that the discrete model has three boundary equilibria and one unique positive equilibrium under certain parametric conditions. We have investigated the local stability of boundary equilibria ,, and the unique positive equilibrium , by the method of linearization. It is proved that the discrete model undergoes a period-doubling bifurcation in a small neighborhood of boundary equilibria and a Neimark-Sacker bifurcation in a small neighborhood of the unique positive equilibrium Further it is shown that every positive solution of the discrete model is bounded and the set is an invariant rectangle. It is proved that if and , then equilibrium of the discrete model is a global attractor. Finally it is proved that the unique positive equilibrium is a global attractor. Some numerical simulations are presented to illustrate theoretical results.