The Influence of Competition Trait-Mediated Effects on Intra-Guild Predation System

Abstract

Zhang Rong, Zhou Shuai, Zhu Wenjun, Zhou Xiaomei

Parasitism can affect the population dynamics in many ways, and its indirect effect is easy to be ignored, that is, it can weaken the host's behavior, physiology and psychology to affect the whole population. In this paper, we build a differential equation model by adding four parameters to study the influence of multiple competitive relationships on the predatorprey system, It includes the enhancement effect g of intraspecific competition and the enhancement effect h of interspecific competition between susceptible population and infected population, the weakening effect m of intraspecific competition and the weakening effect n of interspecific competition between susceptible population and infected population. Through the analysis, it can be concluded that a single g or m can promote the symbiosis of predator and prey, a single h has little effect on the population dynamics, and a single n is not conducive to the symbiosis; The fusion of g and h promotes coexistence, but the fusion of m and n is on the contrary; Interestingly, the combination of multiple regulatory parameters has a chemical effect on the survival of species, but the combination of g, m and h can inhibit coexistence, while the combination of g, m and n can promote coexistence. The reason is that the combination of parameters is not a simple addition of effects, but a prerequisite for mutual influence. To sum up, the research content provides a reference for considering the role of multiple factors, and provides theoretical guidance for explaining ecological phenomena and proving ecological conclusions.

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