幼年竞争瓶颈对动力学行为的影响(英文)

The Effects of Juvenile Competitive Bottleneck on Dynamic Behavior

通过建立具有非线性成熟率的食物网模型研究了幼年竞争瓶颈对种群动力学行为的影响,结论显示当竞争瓶颈比较弱的时,捕食者生活史中的幼年瓶颈对系统的影响要大于成年.模型存在两种可能的共存态或双稳定性,即消费者-捕食者和消费者平衡态共存,但是瓶颈不能诱导系统的双稳定性.进一步研究说明了选择不同的瓶颈或初始条件,瓶颈能够改变次级消费者对捕食者的净影响.

The effect of juvenile competitive bottlenecks on population dynamics is investigated by formulating food web models with a nonlinear maturation rate.The food web system consists of a resource（R）,an intermediate consumer（N） and a predator （P）.Our results show,with weak bottlenecks,that a juvenile bottleneck in the predator＇s life history has a larger impact than a bottleneck in the consumer.In the food web model with bottleneck for the predator,there are two possible internal steady states,and the system can exhibit consumer-predator equilibrium and consumer equilibrium as two alternative stable states,as well as the consumer equilibrium and predator equilibrium as two alternative stable states.No bistable phenomenon induced by bottleneck can be detected,and nothing new happens in system with consumer bottlenecks.Further,we show that a bottleneck can change the net effect of the intermediate consumer on predator from facilitation to inhibition or from inhibition to facilitation,which case occurs depends on both the choice of bottleneck and the initial states of systems.