The Impact of Invasion Rate and Migration Rate on Population in Competitive Food Webs under Habitat Fragmentation
The destruction of landscape habitats can lead to habitat loss and fragmentation.There is competition among spe-cies of the same trophic level in nature,and the invasion and migration rates among different species vary.Therefore,it is of practi-cal significance to study the response mechanism of food webs of competing species with the same nutritional level to invasion and migration rates based on fragmented landscapes.This article establishes a four species collective population model and uses MAT-LAB software to numerically simulate the survival dynamics of the population,studying the effects of invasion and migration rates in fragmented habitats.The results indicate that under fragmented landscapes,the invasion rate of competing species can have an impact on the coexistence results and area of species.The migration rate of two competing species can affect the coexistence area of four species.There are minimum threshold and maximum threshold for the migration rate of species 2.When the migration rate is below the minimum threshold or above the maximum threshold,the coexistence area of four species is zero.The coexistence ar-ea shows an overall upward trend with the increase of species 3 migration rate.The fusion effect of invasion and migration rates be-tween different species can offset or even reverse competitive advantages,leading to the extinction of species 2 and the survival of species 3.The research provides a reference for utilizing the coexistence of species invasion and migration effects,and a theoreti-cal basis for explaining some ecological phenomena and protecting rare species.