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Phylogeography Takes a Relaxed Random Walk in Continuous Space and Time

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Lemey, P., Rambaut, A., Welch, J. J., Suchard, M. A.·2010·Molecular Biology and Evolution

Abstract

Research aimed at understanding the geographic context of evolutionary histories is burgeoning across biological disciplines. Recent endeavors attempt to interpret contemporaneous genetic variation in the light of increasingly detailed geographical and environmental observations. Such interest has promoted the development of phylogeographic inference techniques that explicitly aim to integrate such heterogeneous data. One promising development involves reconstructing phylogeographic history on a continuous landscape. Here, we present a Bayesian statistical approach to infer continuous phylogeographic diffusion using random walk models while simultaneously reconstructing the evolutionary history in time from molecular sequence data. Moreover, by accommodating branch-specific variation in dispersal rates, we relax the most restrictive assumption of the standard Brownian diffusion process and demonstrate increased statistical efficiency in spatial reconstructions of overdispersed random walks by analyzing both simulated and real viral genetic data. We further illustrate how drawing inference about summary statistics from a fully specified stochastic process over both sequence evolution and spatial movement reveals important characteristics of a rabies epidemic. Together with recent advances in discrete phylogeographic inference, the continuous model developments furnish a flexible statistical framework for biogeographical reconstructions that is easily expanded upon to accommodate various landscape genetic features.

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Metadata

Authors
Lemey, P., Rambaut, A., Welch, J. J., & Suchard, M. A.
Venue
Molecular Biology and Evolution
Published
2010-03-04
Volume
27
Issue
8
Pages
1877-1885
ISSN
  • 0737-4038 (ISSN-L)
  • 1537-1719
OpenAlex
W2139166200
Cited by
685
References
8
FWCI
15.59
Type
journal article
Language
en
Open access
green

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