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Pattern formation induced by intraspecific interactions in a predator-prey system
Luciano Stucchi1, Javier Galeano2, Desiderio A Vasquez3
1Universidad del Pacífico, Lima, Peru and Grupo de Sistemas Complejos, Universidad Politécnica de Madrid, 28040 Madrid, Spain.
Abstract:
Differential diffusion is a source of instability in population dynamics systems when species diffuse with different rates. Predator-prey systems show this instability only under certain specific conditions, usually requiring one to involve Holling-type functionals. Here we study the effects of intraspecific cooperation and competition on diffusion-driven instability in a predator-prey system with a different structure. We conduct the analysis on a generalized population dynamics that bounds intraspecific and interspecific interactions with Verhulst-type saturation terms instead of Holling-type functionals. We find that instability occurs due to the intraspecific saturation or intraspecific interactions, both cooperative and competitive. We present numerical simulations and show spatial patterns due to diffusion.
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