Use este identificador para citar ou linkar para este item:
Tipo do documento: Artigo
Título: Phylogeography of Tibouchina papyrus (Pohl) Toledo (Melastomataceae), an endangered tree species from rocky savannas, suggests bidirectional expansion due to climate cooling in the Pleistocene
Autor: Collevatti, Rosane Garcia
Castro, Thaís Guimarães de
Lima, Jacqueline de Souza
Telles, Mariana Pires de Campos
Abstract: Many endemic species present disjunct geographical distribution; therefore, they are suitable models to test hypotheses about the ecological and evolutionary mechanisms involved in the origin of disjunct distributions in these habitats. We studied the genetic structure and phylogeography of Tibouchina papyrus (Melastomataceae), endemic to rocky savannas in Central Brazil, to test hypothesis of vicariance and dispersal in the origin of the disjunct geographical distribution. We sampled 474 individuals from the three localities where the species is reported: Serra dos Pirineus, Serra Dourada, and Serra de Natividade. Analyses were based on the polymorphisms at cpDNA and on nuclear microsatellite loci. To test for vicariance and dispersal we constructed a median-joining network and performed an analysis of molecular variance (AMOVA). We also tested population bottleneck and estimated demographic parameters and time to most recent common ancestor (TMRCA) using coalescent analyses. A remarkable differentiation among populations was found. No significant effect of population expansion was detected and coalescent analyses showed a negligible gene flow among populations and an ancient coalescence time for chloroplast genome.Our results support that the disjunct distribution of T. papyrus may represent a climatic relict. With an estimated TMRCA dated from ∼836.491 ± 107.515 kyr BP (before present), we hypothesized that the disjunct distribution may be the outcome of bidirectional expansion of the geographical distribution favored by the drier and colder conditions that prevailed in much of Brazil during the Pre-Illinoian glaciation, followed by the retraction as the climate became warmer and moister.
Palavras-chave: Cerrado rupestre
Climatic relict
Coalescent analysis
Disjunct geographical distribution
País: Brasil
Instituição: Wiley-Blackwell
Unidade acadêmica: Instituto de Ciências Biológicas - ICB (RG)
Citação: COLLEVATTI, Rosane Garcia; CASTRO, Thaís Guimarães de; LIMA, Jacqueline de Souza; TELLES, Mariana Pires de Campos. Phylogeography of Tibouchina papyrus (Pohl) Toledo (Melastomataceae), an endangered tree species from rocky savannas, suggests bidirectional expansion due to climate cooling in the Pleistocene. Ecology and Evolution, Hoboken, v. 2, n. 5, p. 1024-1035, Apr. 2012.
Tipo de acesso: Acesso Aberto
Identificador do documento: 10.1002/ece3.236
Identificador do documento: 10.1002/ece3.236
Data de publicação: Abr-2012
Aparece nas coleções:ICB - Artigos publicados em periódicos

Arquivos associados a este item:
Arquivo Descrição TamanhoFormato 
Artigo - Rosane Garcia Collevatti - 2012.pdf556,44 kBAdobe PDFThumbnail

Este item está licenciada sob uma Licença Creative Commons Creative Commons