Produção Nacional
Revisado por pares
Recent lineage diversification in a venomous snake through dispersal across the Amazon River
2017; Oxford University Press; Volume: 123; Issue: 3 Linguagem: Inglês
10.1093/biolinnean/blx158
ISSN1095-8312
AutoresH. Lisle Gibbs, Michael G. Sovic, Diana R. Amazonas, Hipócrates de Menezes Chalkidis, David Salazar‐Valenzuela, Ana Maria Moura‐da‐Silva,
Tópico(s)Genetic diversity and population structure
ResumoIdentifying 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 genome-scale 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.
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