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Predator overcomes the Allee effect due to indirect prey-taxis



Rok publikování 2019
Druh Článek v odborném periodiku
Časopis / Zdroj Ecological Complexity
Klíčová slova Allee effect; Taxis-diffusion-reaction; Indirect prey-taxis; Turing bifurcation; Hopf bifurcation; Oscillatory instability
Popis A mathematical model for spatiotemporal dynamics of prey-predator system was studied by means of linear analysis and numerical simulations. The model is a system of PDEs of taxis-diffusion-reaction type, accounting for the ability of predators to detect the locations of higher prey density, which is formalized as indirect prey-taxis, according to hypothesis that the taxis stimulus is a substance being continuously emitted by the prey, diffusing in space and decaying with constant rate in time (e.g. odour, pheromone, exometabolit). The local interactions of the prey and predators are described by the classical Rosenzweig - MacArthur system, which is modified in order to take into account the Allee effect in the predator population. The boundary conditions determine the absence of fluxes of population densities and stimulus concentration through the habitat boundaries. The obtained results suggest that the prey-taxis activity of the predator can destabilize both the stationary and periodic spatially-homogeneous regimes of the species coexistence, causing emergence of various heterogeneous patterns. In particular, it is demonstrated that formation of local dense aggregations induced by prey-taxis allows the predators to overcome the Allee effect in its population growth, avoiding the extinction that occurs in the model in the absence of spatial effects.

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