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The effects of stochasticity on pattern formation in a space- and time-discrete predator-prey system with strong Allee effect in the prey. (English) Zbl 1415.92156

Summary: The effects of demographic and environmental noise on the vital dynamics and spatial pattern formation are studied for a predator-prey system with strong Allee effect in the prey species. Time and space are taken discrete. It is shown that noise can promote extinction depending on the growth and interaction parameters as well as the noise type and amplitude. The extinction risk increases with the noise amplitude; however, the environmental and demographic noise can have different effects on the risk of extinction. In space, the spatial structures obtained are blurred versions of the deterministic ones in most scenarios. In particular, the complex spatial structures that appear in the parameter domains where the deterministic local dynamics leads to extinction are robust to the density-dependent stochastic fluctuations but are disrupted with environmental noise.

MSC:

92D25 Population dynamics (general)
92D40 Ecology
92C15 Developmental biology, pattern formation
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