Phylogenetic relationships and macro-evolutionary patterns within the <Emphasis Type="Italic">Drosophila tripunctata</Emphasis> “radiation” (Diptera: Drosophilidae) |
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Authors: | Lizandra J Robe Vera L S Valente Elgion L S Loreto |
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Institution: | 1.Programa de Pós-Gradua??o em Genética e Biologia Molecular, Departamento de Genética,Universidade Federal do Rio Grande do Sul (UFRGS),Porto Alegre,Brazil;2.Programa de Pós-Gradua??o em Biodiversidade Animal, Centro de Ciências Naturais e Exatas (CCNE),Universidade Federal de Santa Maria (UFSM),Santa Maria,Brazil |
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Abstract: | Despite previous efforts, the evolutionary history of the immigrans-tripunctata clade remains obscure in part due to its hypothesized origin through a rapid radiation. We performed a supermatrix analysis
(3,243 base pairs) coupled with richness patterns, environmental phylogenetic signal and radiation tests in order to address
phylogenetic relationships and macro-evolutionary hypotheses within this complex group of species. We propose a well-supported
evolutionary scenario for the immigrans-tripunctata clade species, in which the tripunctata “radiation” was monophyletic and subdivided into three main lineages: the first including D. pallidipennis (pallidipennis group) imbedded among members of the tripunctata group; the second clustering the cardini and guarani groups; and the third grouping representatives from the tripunctata,
calloptera and guaramunu groups. Therefore, we hypothesize that the tripunctata group encompasses a diphyletic taxon, with one clade including the pallidipennis group and the other showing a close affinity to the calloptera and guaramunu groups. Our results also suggest that niche evolution seems to have played a central role in the evolutionary history of
the tripunctata species “radiation” allowing effective dispersion and diversification in the Neotropics, possibly in a southwards direction.
Although the data as a whole support the notion that this occurred through rapid and successive speciation events, the radiation
hypothesis remains to be further corroborated. |
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