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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Recent lineage diversification in a venomous snake through dispersal across the Amazon River

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Gibbs, H. Lisle [1, 2] ; Sovic, Michael [1] ; Amazonas, Diana [3] ; Chalkidis, Hippocrates [4] ; Salazar-Valenzuela, David [5] ; Moura-Da-Silva, Ana M. [3]
Total Authors: 6
[1] Ohio State Univ, Dept Evolut Ecol & Organismal Biol, Columbus, OH 43210 - USA
[2] Ohio State Univ, Ohio Biodivers Conservat Partnership, Columbus, OH 43210 - USA
[3] Inst Butantan, Lab Imunopatol, Sao Paulo - Brazil
[4] Fac Integradas Tapajos, Santarem, Para - Brazil
[5] Univ Tecnol Indoamer, Ctr Invest Biodiversidad & Cambio Climat, Quito - Ecuador
Total Affiliations: 5
Document type: Journal article
Source: Biological Journal of the Linnean Society; v. 123, n. 3, p. 651-665, MAR 2018.
Web of Science Citations: 6

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 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. (AU)

FAPESP's process: 16/50127-5 - Dimensions US-BIOTA São Paulo: scales of biodiversity: integrated studies of snake venom evolution and function across multiple levels of diversity
Grantee:Inácio de Loiola Meirelles Junqueira de Azevedo
Support type: BIOTA-FAPESP Program - Thematic Grants