2013-09-302013-09-302008FACCIO, Maya Sonnenschein. Filogeografia de três espécies de Passeiriformes (Suboscines) na região do Baixo Tocantins - Ilha do Marajó - Pará. 2008. 112 f. Dissertação (Mestrado) - Universidade Federal do Pará, Museu Paraense Emílio Goeldi, Belém, 2008. Programa de Pós-Graduação em Zoologia.https://repositorio.ufpa.br/handle/2011/4302The area of the lower Tocantins river - Marajó Island is an excellent place to carry out a study integrating geological and biological data to understand processes responsible for the diversification of species in the Amazon. Population genetics and phylogenetic analyses of populations of three selected bird species (Xiphorhynchus spixii and Glyphorynchus spirurus - Dendrocolaptidae and Willisornis poecilinotus - Thamnophilidae) were carried out employing the mitochondrial gene ND2, and related to the geological scenario proposed for the landscape evolution in the area. Estimates based on maximum likelihood and Bayesian inference where used to infer intraespecific phylogenies and haplotype networks, in addition to tests for deviation of neutrality R2, AMOVA, F ST e Nm, which were employed in population genetic analyses of the three selected species. Xiphorhynchus spixii showed no phylogeographic structure and high levels of gene flow among all populations analyzed. The phylogenetic trees recovered for G. spirurus populations presented one group of haplotypes endemic to the Marajó Island (IM) sister to a second group with the remaining haplotypes belonging to all three areas analyzed; these topologies imply an apparent secondary contact between isolated endemic populations of IM with those of the continent. The tree obtained for W. poecilinotus was similar to that of G. spirurus, indicating that the formation of IM might have affected in a similar way populations of those two species sharing similar dispersion abilities. On the other hand, the lack of phylogeographic structure detected for X.spixii might have been caused by a higher dispersal capacity, thus leading to a different response to the same set of vicariant events. Molecular clock estimates for the node separating haplotypes endemic to IM from those found in ali three areas were 747.000 years BP in G. spirurus and 798.000 years BP in W. poecilinotus thus older than the estimated separation of the IM from the continent (near 10.000 years BP) based on geological data.porAcesso AbertoAvesFilogenéticaGlyphorynchs spirurusXiphorhynchus spixiiWillisornis poecilinotusEspécie (Zoologia)DiversificaçãoIlha de Marajó - PARio Tocantins (Baixo)Pará - EstadoAmazônia brasileiraDissertaçãoCNPQ::CIENCIAS BIOLOGICAS::ZOOLOGIA::TAXONOMIA DOS GRUPOS RECENTES