Phylogeography of Tibouchina papyrus (Pohl) Toledo (Melastomataceae), an endangered tree species from rocky savannas, suggests bidirectional expansion due to climate cooling in the Pleistocene

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dc.creatorCollevatti, Rosane Garcia
dc.creatorCastro, Thaís Guimarães de
dc.creatorLima, Jacqueline de Souza
dc.creatorTelles, Mariana Pires de Campos
dc.date.accessioned2017-07-10T15:34:11Z
dc.date.available2017-07-10T15:34:11Z
dc.date.issued2012-04
dc.description.abstractMany 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.pt_BR
dc.identifier.citationCOLLEVATTI, 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.pt_BR
dc.identifier.doi10.1002/ece3.236
dc.identifier.issne- 2045-7758
dc.identifier.urihttp://repositorio.bc.ufg.br/handle/ri/12050
dc.language.isoengpt_BR
dc.publisherWiley-Blackwellpt_BR
dc.publisher.countryBrasilpt_BR
dc.publisher.departmentInstituto de Ciências Biológicas - ICB (RG)pt_BR
dc.rightsAcesso Abertopt_BR
dc.subjectCerrado rupestrept_BR
dc.subjectClimatic relictpt_BR
dc.subjectCoalescent analysispt_BR
dc.subjectcpDNApt_BR
dc.subjectDisjunct geographical distributionpt_BR
dc.subjectMicrosatellitespt_BR
dc.titlePhylogeography of Tibouchina papyrus (Pohl) Toledo (Melastomataceae), an endangered tree species from rocky savannas, suggests bidirectional expansion due to climate cooling in the Pleistocenept_BR
dc.typeArtigopt_BR

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