Effects Of Habitat Destruction And Climate Warming On Intraguild Predation System

Species interaction plays an important role in the construction and stability of ecological communities,as well as in limiting the spatial distribution and abundance of species.Habitat destruction and environmental change(climate warming)can change the intensity of interaction.Previous studies have established temperature-dependent models of consumer-resource interaction and competition interaction,but so far only a few theoretical and experimental studies have explored the effects of temperature and habitat destruction on intraguild predation model.Intraguild predation system is a comprehensive system of predation and competition.It refers to two species consuming the same resources,and one species(IG predator)preys on another species(IG prey).It is an important component of the complex natural food web,and it is ubiquitous in the ecological food web.Based on this,the main purpose of this paper is to study the effects of habitat destruction and climate warming on the density,stability and species coexistence of the intraguild predation system.Firstly,the mathematical model of the intraguild predation system with habitat destruction is established,and the local and global stability of the equilibrium point of the model is analyzed mathematically.At the same time,the numerical simulation of the system is carried out by using some parameters provided by the existing literature.The results show that:(1)a certain degree of habitat destruction will change the species distribution in the equilibrium state of the intraguild predation system.(2)Increasing the degree of habitat destruction is not conducive to species coexistence.(3)Increasing the degree of habitat destruction will reduce the intensity of species interaction first,then increase and then decrease.It shows that the disturbance stability of population increases first,then decreases,and finally increases with the increase of the degree of habitat destruction.Secondly,the mathematical model of temperature-dependent intraguild predation system is established,and the local and global stability of the equilibrium point of the model is analyzed.The model is simulated by using some parameters in the literature.The results show that:(1)Warming is detrimental to the equilibrium state density of the top predator,and the IG predator is more sensitive to temperature than the prey.(2)Moderate warming is beneficial to species coexistence,but too high temperature is detrimental to species coexistence.(3)The intensity of long-term interactions among species decreases first and then increases with warming,which may lead to changes in population stability.