We study an individual-based model in which two spatially distributed species, characterized by different diffusivities, compete for resources. We consider three different ecological settings. In the first, diffusing faster has a cost in terms of reproduction rate. In the second case, resources are not uniformly distributed in space. In the third case, the two species are transported by a fluid flow. In all these cases, at varying the parameters, we observe a transition from a regime in which diffusing faster confers an effective selective advantage to one in which it constitutes a disadvantage. We analytically estimate the magnitude of this advantage (or disadvantage) and test it by measuring fixation probabilities in simulations of the individual-based model. Our results provide a framework to quantify evolutionary pressure for increased or decreased dispersal in a given environment.

Pigolotti, S., & BENZI, R. (2016). Competition between fast- and slow-diffusing species in non-homogeneous environments. JOURNAL OF THEORETICAL BIOLOGY, 395, 204-210 [10.1016/j.jtbi.2016.01.033].

Competition between fast- and slow-diffusing species in non-homogeneous environments

BENZI, ROBERTO
2016-04-21

Abstract

We study an individual-based model in which two spatially distributed species, characterized by different diffusivities, compete for resources. We consider three different ecological settings. In the first, diffusing faster has a cost in terms of reproduction rate. In the second case, resources are not uniformly distributed in space. In the third case, the two species are transported by a fluid flow. In all these cases, at varying the parameters, we observe a transition from a regime in which diffusing faster confers an effective selective advantage to one in which it constitutes a disadvantage. We analytically estimate the magnitude of this advantage (or disadvantage) and test it by measuring fixation probabilities in simulations of the individual-based model. Our results provide a framework to quantify evolutionary pressure for increased or decreased dispersal in a given environment.
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici
English
Evolution of dispersal; Individual based models; Optimal dispersal strategy; Reaction-diffusion models; Spatial population genetics; Biological Evolution; Ecosystem; Models, Biological
Pigolotti, S., & BENZI, R. (2016). Competition between fast- and slow-diffusing species in non-homogeneous environments. JOURNAL OF THEORETICAL BIOLOGY, 395, 204-210 [10.1016/j.jtbi.2016.01.033].
Pigolotti, S; Benzi, R
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/173400
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