Analytical detection of stationary and dynamic patterns in a prey-predator model with reproductive Allee effect in prey growth

TL;DR

This paper investigates how reproductive Allee effects influence pattern formation and stability in a prey-predator model with complex dynamics, revealing the emergence of various stationary and dynamic spatial patterns.

Contribution

It introduces a detailed analysis of reproductive Allee effects in a prey-predator model with Beddington-DeAngelis response, including bifurcation analysis and pattern classification.

Findings

Reproductive Allee effect destabilizes coexistence equilibrium.

Various stationary solutions including Turing patterns and localized solutions identified.

Complex dynamic patterns such as traveling waves and chaos observed.

Abstract

Allee effect in population dynamics has a major impact in suppressing the paradox of enrichment through global bifurcation, and it can generate highly complex dynamics. The influence of the reproductive Allee effect, incorporated in the prey's growth rate of a prey-predator model with Beddington-DeAngelis functional response, is investigated here. Preliminary local and global bifurcations are identified of the temporal model. Existence and non-existence of heterogeneous steady-state solutions of the spatio-temporal system are established for suitable ranges of parameter values. The spatio-temporal model satisfies Turing instability conditions, but numerical investigation reveals that the heterogeneous patterns corresponding to unstable Turing eigen modes acts as a transitory pattern. Inclusion of the reproductive Allee effect in the prey population has a destabilising effect on the coexistence equilibrium. For a range of parameter values, various branches of stationary solutions including mode-dependent Turing solutions and localized pattern solutions are identified using numerical bifurcation technique. The model is also capable to produce some complex dynamic patterns such as travelling wave, moving pulse solution, and spatio-temporal chaos for certain range of parameters and diffusivity along with appropriate choice of initial conditions Judicious choices of parametrization for the Beddington-DeAngelis functional response help us to infer about the resulting patterns for similar prey-predator models with Holling type-II functional response and ratio-dependent functional response.