Equilibrium | Existence Condition | Stability Condition |
Always exists | Always saddle | |
Always exists | Sink if Saddle if | |
Always sink |
This paper investigates the complex dynamics of a Harrison-type predator-prey model that incorporating: (1) A constant time delay in the functional response term of the predator growth equation; and (2) environmental noise in both prey and predator equations. We provide the rigorous results of our model including the dynamical behaviors of a positive solution and Hopf bifurcation. We also perform numerical simulations on the effects of delay or/and noise when the corresponding ODE model has an interior solution. Our theoretical and numerical results show that delay can either remain stability or destabilize the model; large noise could destabilize the model; and the combination of delay and noise could intensify the periodic instability of the model. Our results may provide us useful biological insights into population managements for prey-predator interaction models.
Citation: |
Figure 1.
Phase portrait of model (2) and the parameters are taken as
Figure 2.
The effects of the time delay
Table 1.
The existence and stability of equilibria for model (2) where
Equilibrium | Existence Condition | Stability Condition |
Always exists | Always saddle | |
Always exists | Sink if Saddle if | |
Always sink |
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