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Predicting the Effectiveness of Population Replacement Strategy Using Mathematical Modeling
20:36

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Published on: July 4, 2007

Bayesian estimation of recent migration rates after a spatial expansion.

Grant Hamilton1, Mathias Currat, Nicolas Ray

  • 1Computational and Molecular Population Genetics Lab, Zoological Institute, University of Bern, Switzerland. msuchard@ucla.edu

Genetics
|February 18, 2005
PubMed
Summary

Approximate Bayesian computation (ABC) effectively estimates parameters for complex demographic models. This study refines ABC for range expansion analysis, revealing post-glacial expansion and male-biased migration in common voles.

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Area of Science:

  • Population Genetics
  • Computational Biology
  • Evolutionary Biology

Background:

  • Approximate Bayesian computation (ABC) offers flexibility for parameter estimation in complex demographic models intractable for full-likelihood methods.
  • Range expansion dynamics are crucial for understanding species' evolutionary history and adaptation.
  • Previous methods struggled with complex models, necessitating advanced computational approaches.

Purpose of the Study:

  • To evaluate the utility of ABC for estimating parameters of range expansion in a 2D stepping-stone model.
  • To introduce a modification to the ABC procedure to enhance estimation accuracy.
  • To apply the refined ABC method to infer demographic history and migration patterns in Swiss common vole populations.

Main Methods:

  • Utilized Approximate Bayesian computation (ABC) for parameter estimation.
  • Employed a two-dimensional stepping-stone model to simulate population range expansion.
  • Introduced a minor modification to the standard ABC procedure to improve accuracy.
  • Analyzed genetic data from five Swiss common vole populations using sex-linked and nuclear markers.

Main Results:

  • The modified ABC method demonstrated improved accuracy in parameter estimation for range expansion models.
  • Estimates for Swiss common vole populations suggest range expansion occurred less than 10,000 years ago, post-glaciation.
  • Analysis revealed a strong male bias in migration rates within these populations.

Conclusions:

  • ABC is a powerful and adaptable tool for inferring demographic parameters in complex scenarios, including range expansions.
  • The common vole populations in Switzerland experienced recent post-glacial expansion.
  • Observed male-biased migration has significant implications for the genetic structure and evolutionary trajectory of the species.