Permanence of a general discrete-time two-species-interaction model with nonlinear per-capita growth rates

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Abstract

The per-capita growth rate of a species is influenced by densityindependent, positive and negative density-dependent factors. These factors can lead to nonlinearity with a consequence that species may process multiple nontrivial equilibria in its single state (e.g., Allee effects). This makes the study of permanence of discrete-time multi-species population models very challenging due to the complex boundary dynamics. In this paper, we explore the permanence of a general discrete-time two-species-interaction model with nonlinear per-capita growth rates for the first time. We find a simple sufficient condition for guaranteeing the permanence of the system by applying and extending the ecological concept of the relative nonlinearity to estimate systems' external Lyapunov exponents. Our method allows us to fully characterize the effects of nonlinearities in the per-capita growth functions and implies that the fluctuated populations may devastate the permanence of systems and lead to multiple attractors. These results are illustrated with specific two species competition and predator-prey models with generic nonlinear per-capita growth functions. Finally, we discuss the potential biological implications of our results.

Original languageEnglish (US)
Pages (from-to)2123-2142
Number of pages20
JournalDiscrete and Continuous Dynamical Systems - Series B
Volume18
Issue number8
DOIs
StatePublished - Oct 1 2013

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Keywords

  • Allee effects
  • Nonlinear per-capita growth rates
  • Permanence
  • Relative nonlinearity
  • Two-species-interaction population models

ASJC Scopus subject areas

  • Discrete Mathematics and Combinatorics
  • Applied Mathematics

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