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    Título : Recent lineage diversification in a venomous snake through dispersal across the Amazon River
    Autor : Gibbs, Lisle
    Sovic, Michael
    Amazonas, Diana
    Chalkidis, Hippocrates
    Salazar-Valenzuela, David
    Moura-Da Silva, Ana
    Fecha de publicación : 2018
    Editorial : Biological Journal of the Linnean Society. Volume 123, Issue 3, Pages 651 - 665
    Resumen : Identifying the evolutionary and ecological mechanisms that drive lineage diversification in the species-rich tropics is of broad interest to evolutionary biologists. Here, we use phylogeographical and demographic analyses of genomescale RADseq data to assess the impact of a large geographical feature, the Amazon River, on lineage formation in a venomous pitviper, Bothrops atrox. We compared genetic differentiation in samples from four sites near Santarem, Brazil, that spanned the Amazon and represented major habitat types. A species delimitation analysis identified each population as a distinct evolutionary lineage while a species tree analysis with populations as taxa revealed a phylogenetic tree consistent with dispersal across the Amazon from north to south. Phylogenetic analyses of mitochondrial DNA variation confirmed this pattern and suggest that all lineages originated during the mid- to late Pleistocene. Historical demographic analyses support a population model of lineage formation through isolation between lineages with low ongoing migration between large populations and reject a model of differentiation through isolation by distance alone. The results provide a rare example of a phylogeographical pattern demonstrating dispersal over evolutionary timescales across a large tropical river and suggest a role for the Amazon River as a driver of in situ divergence both by impeding (but not preventing) gene flow and through parapatric differentiation along an ecological gradient. © 2018 The Linnean Society of London, Biological Journal of the Linnean Society.
    URI : https://academic.oup.com/biolinnean/article/123/3/651/4840585
    http://repositorio.uti.edu.ec//handle/123456789/3471
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