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

JOURNAL OF THEORETICAL BIOLOGY

卷:395

Article

Pigolotti, Simone¹  Benzi, Roberto^2,3 

[1] Univ Politecn Cataluna, Dept Fis, Edif GAIA,Rambla St Nebridi 22, Barcelona 08222, Spain

[2] Univ Roma Tor Vergata, Dipartimento Fis, Via Ric Sci 1, I-00133 Rome, Italy

[3] Ist Nazl Fis Nucl, Via Ric Sci 1, I-00133 Rome, Italy

关键词: Evolution of dispersal;    Reaction-diffusion models;    Optimal dispersal strategy;    Individual based models;    Spatial population genetics;   

DOI  :  10.1016/j.jtbi.2016.01.033

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

Free