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|Title:||Phylogeography And Ecological Niche Modelling Uncover The Evolutionary History Of Tibouchina Hatschbachii (melastomataceae), A Taxon Restricted To The Subtropical Grasslands Of South America|
Fabiano Rodrigo; Zwiener
Victor Pereira; Morokawa
|Abstract:||Understanding the evolutionary history of species involves comprehension of demographic, biogeographical and ecological processes in a spatiotemporal context. We used molecular dating integrated with coalescent and ecological niche models (ENMs) in a representative study system to investigate the effects of recent geological movements along the Ribeira Iguape valley (RIV) and Quaternary climate fluctuations on the subtropical flora of South America. We tested if (1) RIV influenced the genetic structure of endemic species, leading to differentiation and geographical structuring of lineages and if (2) the current disjunct distributions of grassland species are due to contractions related to climatic fluctuation during the Quaternary. We studied three intergenic regions of plastid DNA and estimated palaeodistributions of Tibouchina hatschbachii, a grassland shrub endemic to southern Brazil. Low nucleotide diversity and high haplotype diversity and genetic-geographical structure were identified, suggesting two distinct lineages that separated c. 1.0 Mya. These phylogeographic patterns are consistent with Quaternary climate fluctuations and the location of RIV. Demographic analyses, and ENMs, showed a greater demographic stability of T. hatschbachii at the last glacial maximum and a recent population retraction. Our results provide strong evidence for recent geological movements and Quaternary climate fluctuations as important factors in the evolutionary history of South American subtropical biodiversity.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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