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Dispersal vs. stochasticity: competition for persistence in a reaction-diffusion model with strong Allee dynamics

Budroni, Marcello Antonio and Rossi, Federico and Farris, Emmanuele and Filigheddu, Rossella Speranza and Rustici, Mauro (2011) Dispersal vs. stochasticity: competition for persistence in a reaction-diffusion model with strong Allee dynamics. Ecological Modelling (in press). ISSN 0304-3800. eISSN 1872-7026. Article.

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DOI: 10.1016/j.ecolmodel.2011.05.015


In ecological and population dynamics, the coupling between random perturbations and the Allee effect could drive small and confined populations of rare species to extinction. In this paper, we propose a general model for describing spatio-temporal dynamics characterized by demographic Allee growth. In this approach, we include the combined contribution of stochasticity and spatial processes, typically dispersal, which is scarcely explored in the literature. The model is formulated in a reaction-diffusion framework, where the dynamics is regulated by a typical Allee–dispersal evolution and the resilience to white noise is probed at different perturbation amplitudes. Preliminary results show that dispersal processes can compensate random fluctuations to favor the stabilization of the species establishment.

Item Type:Article
ID Code:6215
Uncontrolled Keywords:Allee effect, population dynamics, pseudo-stochastic reaction-diffusion processes, Mediterranean plants
Subjects:Area 05 - Scienze biologiche > BIO/03 Botanica ambientale e applicata
Area 03 - Scienze chimiche > CHIM/02 Chimica fisica
Area 05 - Scienze biologiche > BIO/02 Botanica sistematica
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze botaniche, ecologiche e geologiche
001 Università di Sassari > 01 Dipartimenti > Chimica
Copyright Holders:© 2011 Elsevier B.V.
Deposited On:06 Jul 2011 09:13

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