914647.fig.004a
(a)
914647.fig.004b
(b)
Figure 4: (a) Trajectories based on the initial point (0.5, 0.1) in system (1), where the black symbol denotes the initial point (0.5, 0.1); the red curve denotes the trajectory when ; the blue curve denotes the trajectory when ; and the arrow denotes the direction of the trajectory. (b) Bifurcation diagram of system (1), where the red symbol denotes the bifurcation point; the dashed line implies the instability of the semitrivial solution; and the black solid line represents the maximum value of population , which is stable, where , .