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Demographic inference under the coalescent in a spatial continuum

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  • Guindon, Stéphane
  • Guo, Hongbin
  • Welch, David

Abstract

Understanding population dynamics from the analysis of molecular and spatial data requires sound statistical modeling. Current approaches assume that populations are naturally partitioned into discrete demes, thereby failing to be relevant in cases where individuals are scattered on a spatial continuum. Other models predict the formation of increasingly tight clusters of individuals in space, which, again, conflicts with biological evidence. Building on recent theoretical work, we introduce a new genealogy-based inference framework that alleviates these issues. This approach effectively implements a stochastic model in which the distribution of individuals is homogeneous and stationary, thereby providing a relevant null model for the fluctuation of genetic diversity in time and space. Importantly, the spatial density of individuals in a population and their range of dispersal during the course of evolution are two parameters that can be inferred separately with this method. The validity of the new inference framework is confirmed with extensive simulations and the analysis of influenza sequences collected over five seasons in the USA.

Suggested Citation

  • Guindon, Stéphane & Guo, Hongbin & Welch, David, 2016. "Demographic inference under the coalescent in a spatial continuum," Theoretical Population Biology, Elsevier, vol. 111(C), pages 43-50.
    • Handle: RePEc:eee:thpobi:v:111:y:2016:i:c:p:43-50
    DOI: 10.1016/j.tpb.2016.05.002
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    References listed on IDEAS

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    Cited by:

    1. Wirtz, Johannes & Guindon, Stéphane, 2022. "Rate of coalescence of lineage pairs in the Spatial Λ-Fleming–Viot process," Theoretical Population Biology, Elsevier, vol. 146(C), pages 15-28.

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