A new predator–prey model with a profitless delay of digestion and impulsive perturbation on the prey

摘要

In this paper, we formulate a robust prey-dependent consumption predator–prey model with a delay of digestion and impulsive perturbation on the prey. Using the discrete dynamical system determined by the stroboscopic map, we obtain a ‘predator-eradication’ periodic solution and show that the ‘predator-eradication’ periodic solution is globally attractive when harvesting for the prey is over certain value. Using a new qualitative analysis method for impulsive and delay differential equations, we prove the system is uniformly persistent when harvesting for the prey is under certain value. Further, we show the delay of digestion is a “profitless” time delay. Moreover, we show our theoretical results by numerical simulation. In this paper, the main feature is that we introduce a delay of digestion and impulsive effects into the predator–prey model and exhibit a new mathematical method which is applied to investigate the system which is governed by both impulsive and delay differential equations.