Speed of adaptation in structured populations |
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Authors: | E de A Gonçalves V M de Oliveira A Rosas P RA Campos |
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Institution: | 1.Departamento de Estatística e Informática,Universidade Federal Rural de Pernambuco,Recife,Brazil;2.Departamento de Física, CCEN,Universidade Federal da Paraíba,Jo?o Pessoa,Brazil;3.Departamento de Física,Universidade Federal Rural de Pernambuco,Recife,Brazil |
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Abstract: | Adaptation of populations takes place with the occurrence and subsequent fixation of mutations that confer some selective
advantage
to the individuals which acquire it. For this reason, the study of the process of fixation of advantageous mutations has a
long history
in the population genetics literature. Particularly, the previous investigations aimed to find out the main evolutionary forces
affecting the strength of natural selection in the populations.
In the current work, we investigate the dynamics of fixation of beneficial mutations in a subdivided population. The subpopulations
(demes)
can exchange migrants
among their neighbors, in a migration network which is assumed to have either a random graph or a scale-free topology. We
have observed that the migration rate
drastically affects the dynamics of mutation fixation, despite of the fact that the probability of fixation is invariant on
the
migration rate, accordingly to
Maruyama's conjecture. In addition, we have noticed a topological dependence of the adaptive evolution of the population when
clonal interference
becomes effective. |
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Keywords: | 87 23 Kg Dynamics of evolution 87 15 Aa Theory and modeling computer simulation |
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