4.5 Article

Effects of demographic stochasticity and life-history strategies on times and probabilities to fixation

期刊

HEREDITY
卷 121, 期 4, 页码 374-386

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NATURE PUBLISHING GROUP
DOI: 10.1038/s41437-018-0118-6

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资金

  1. Chair Modelisation Mathematique et Biodiversite of VEOLIA-Ecole Polytechnique-MNHN-F.X.
  2. Mission for Inter-disciplinarity at CNRS
  3. Investissement d'avenir project, LabEx LMH [ANR-11-LABX-0056-LMH]
  4. Agence National de la Recherche [ANR SEAD - ANR-13-ADAP-0011]

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How life-history strategies influence the evolution of populations is not well understood. Most existing models stem from the Wright-Fisher model which considers discrete generations and a fixed population size, thus not taking into account any potential consequences of overlapping generations and demographic stochasticity on allelic frequencies. We introduce an individual-based model in which both population size and genotypic frequencies at a single bi-allelic locus are emergent properties of the model. Demographic parameters can be defined so as to represent a large range of r and K life-history strategies in a stable environment, and appropriate fixed effective population sizes are calculated so as to compare our model to the Wright-Fisher diffusion. Our results indicate that models with fixed population size that stem from the Wright-Fisher diffusion cannot fully capture the consequences of demographic stochasticity on allele fixation in long-lived species with low reproductive rates. This discrepancy is accentuated in the presence of demo-genetic feedback. Furthermore, we predict that populations with K life-histories should maintain lower genetic diversity than those with r life-histories.

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