Dynamics Analysis of a Nutrient-Plankton Model with a Time Delay

Figure 6

(a) Bifurcation diagram of system (3) with and initial point (0.6, 0.7, 16); (b) the stability switches of positive equilibrium in the component with respect to time delay for and , where the green point denotes the Hopf bifurcation point, the black solid line denotes the stable positive equilibrium, the black dashed line denotes the unstable positive equilibrium, and the blue and red curves denote the maximum and minimum values of zooplankton density , respectively.

(a)

(b)