Competition between fast- and slow-diffusing species in non-homogeneous environments
Authored by Simone Pigolotti, Roberto Benzi
Date Published: 2016
DOI: 10.1016/j.jtbi.2016.01.033
Sponsors:
spanish ministeries
Platforms:
No platforms listed
Model Documentation:
Other Narrative
Mathematical description
Model Code URLs:
Model code not found
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. (C) 2016 Elsevier Ltd. All rights reserved.
Tags
Evolution
probability
Dispersal
population
Model
Demographic stochasticity
Fixation
Spatial variation