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Parametric Analysis of a Predator–prey System Stabilized by a Top Predator

Abstract

We present a complete parametric analysis of a predator–prey system influenced by a top predator. We study ecosystems with abundant nutrient supply for the prey where the prey multiplication can be considered as proportional to its density. The main questions we examine are the following: (1) Can the top predator stabilize such a system at low densities of prey? (2) What possible dynamic behaviors can occur? (3) Under which conditions can the top predation result in the system stabilization? We use a system of two nonlinear ordinary differential equations with the density of the top predator as a parameter. The model is investigated with methods of qualitative theory of ODEs and the theory of bifurcations. The existence of 12 qualitatively different types of dynamics and complex structure of the parametric space are demonstrated. Our studies of phase portraits and parametric diagrams show that a top predator can be an important factor leading to stabilization of the predator-prey system with abundant nutrient supply. Although the model here is applied to the plankton communities with fish (or carnivorous zooplankton) as the top trophic level, the general form of the equations allows applications of our results to other ecological systems.

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Correspondence to Bai-Lian Li.

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Morozov, A.Y., Li, BL. Parametric Analysis of a Predator–prey System Stabilized by a Top Predator. J. Math. Biol. 53, 305–335 (2006). https://doi.org/10.1007/s00285-006-0008-z

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  • DOI: https://doi.org/10.1007/s00285-006-0008-z

Keywords

  • Predator–prey system
  • Top predator
  • Plankton models
  • Stabilization
  • Bifurcation analysis