Philippine Science Letters
Phil. Sci. Lett. 2014 7 (1) 67-72
available online: March 1, 2014
Email Address: firstname.lastname@example.org
Received: November 4, 2013
Revised: January 24, 2014
Accepted: February 7, 2014
In this paper, a system of delay differential equations that models two predator populations consuming a single prey population is considered. The prey population follows a logistic growth in the absence of predators while each of the predator populations has functional response of Holling type III. Each of these response terms includes a delay time which reflects the gestation period of the respective predator population. The positive equilibrium solution of the form (x, y, y) is called the symmetric equilibrium. This work examines the effects of the difference in gestation periods to the dynamical behaviour of the symmetric equilibrium. Conditions for stability and bifurcations of the symmetric equilibrium are given when the delay times are unequal. Numerical simulations are performed to illustrate stability switch and emergence of periodic solution through Hopf bifurcation.