Impact of species enrichment and fishing mortality in three species food chain models

摘要: Abstract In the present article, we consider two food chain models with three trophic levels: one is ‘prey–predator–top predator’ system where top-predator consumes only predator level and another ‘prey–predator–generalist generalist-predator (top level) both prey species. We examine impacts of different levels nutrient supply to bottom species (prey) in models. derive conditions when additional cannot bring top coexist systems if absent prior supply. Once are an supply, biomass reduces or even goes extinction due a massive amount also explore fishing mortality achieve maximum sustainable yield (MSY) from individual level. The most important conclusion that harvesting at MSY policy system.