研究了一个捕食者具连续收获与食饵具脉冲存放的阶段结构时滞捕食-食饵模型.根据生物资源管理的实际,改进了捕食者具阶段结构的捕食-食饵模型,即原来假设每个捕食者个体都具有相同的捕食食饵的能力.假设捕食者按年龄分为两个阶段,即幼体和成体,而且幼体无能力捕食食饵.得到了捕食者灭绝周期解全局吸引和系统持久的充分条件.结论说明了脉冲存放食饵对系统的持久起了重要的作用,并且为生物资源管理提供了策略基础.数值分析也进一步说明了系统的动力学性质.
A stage-structured delayed predator-prey model with impulsive stocking on prey and continuous harvesting on predator is investigated. According to the fact of biological resource managemerit, the assumption of a predator-prey model with stage structure for predator population that each individual predator has the same ability to capture prey was improved. It was assumed that the immature individuals and the mature individuals of the predator population were divided by a fixed age and that immature predator population does not have the ability to attack prey. Sufficient conditions, which guarantee the global attractivity of predator-extinction periodic solution and the permanence of the system, were obtained. The results show that the behavior of impulsive stocking on prey plays an important rote for the permanence of the system, and provides tactical basis for the biological resource management. Furthermore, numerical analysis is inserted to illuminate the dynamics of the system.