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vol.67 número4  suppl.Diversidade genética e evidências de expansão demográfica recente nas populações de aves aquáticas do Pantanal brasileiroEstruturação populacional do endêmico cuspidor-de-máscara-preta, Conopophaga melanops melanops (Vieillot, 1818) (Aves, Conopophagidae), na floresta Atlântica brasileira índice de autoresíndice de assuntospesquisa de artigos
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Brazilian Journal of Biology

versão impressa ISSN 1519-6984versão On-line ISSN 1678-4375

Resumo

DANTAS, GPM.; SANTOS, FR.  e  MARINI, MA.. Genetic variability of Conopophaga lineata (Conopophagidae) (Wied-Neuwied, 1831) in Atlantic Forest fragments. Braz. J. Biol. [online]. 2007, vol.67, n.4, suppl., pp.859-865. ISSN 1519-6984.  http://dx.doi.org/10.1590/S1519-69842007000500008.

Forest fragmentation affects bird populations in many ways, modifying the composition of communities and favouring open country species. The Atlantic Forest is considered one of the most important biomes in the world, due to its great biodiversity, accelerated rates of deforestation, and high endemism. Despite these characteristics, few studies have evaluated the effects of forest fragmentation in the genetic structure of Atlantic forest bird populations. So, this study aims to verify the effects of forest fragmentation in the genetic population structure of Conopophaga lineata, through RAPD markers. To achieve this goal, 89 C. lineata individuals were captured in nine Atlantic Forest fragments in Minas Gerais State. The RAPD data indicate that forest fragmentation has not affected the genetic variation of C. lineata populations (Mann-Whitney U = 3.50; p = 0.11). Great part of the genetic variability of this species is found within populations and it was not observed a correlation between genetic and geographic distance (Mantel test t = 0.6250; p = 073). UPGMA analyses did not show defined clades and all branches showed low statistical support. The low population differentiation observed in this species can be due to a high gene flow among populations or a recent fragmentation. Thus, the current diversity status of C. lineata populations indicates that this species is not significantly affected by fragmentation. However, more genetic studies are essential to improve conservation strategies of Brazilian Atlantic Forest birds.

Palavras-chave : RAPD; passeriformes; birds.

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