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Phylogenetic relationships of Lygodactylus geckos from the Gulf of Guinea islands: rapid rates of mitochondrial DNA sequence evolution?
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Orientador(es)
Resumo(s)
Mitochondrial DNA (12S rRNA, 16S rRNA and cytochrome b) sequences and nuclear
sequences (C-mos) were analysed within Lygodactylus thomensis from three volcanic islands in
the Gulf of Guinea that have never been connected to the continent. Our aim was to assess
interrelationships between the three subspecies to test a recent hypothesis suggesting high rates
of mitochondrial DNA (mtDNA) sequence evolution in geckos. Our results indicate, based on
mtDNA sequence data, that the three subspecies are genetically differentiated at a level more
typically observed between species. However, the forms cannot be differentiated using the
nuclear marker C-mos. These results further substantiate the hypothesis of rapid rates of mtDNA
sequence evolution in geckos, although the alternative that C-mos is evolving more slowly
cannot be discounted. They also suggest that present calibrations for molecular clocks are at the
upper limit of divergence over time.
Descrição
Palavras-chave
Dwarf gecko Genetic analysis Phylogeny São Tomé Príncipe Annobon . Faculdade de Ciências da Vida
Contexto Educativo
Citação
Jesus, J., Brehm, A., & Harris, D. J. (2006). Phylogenetic relationships of Lygodactylus geckos from the Gulf of Guinea islands: rapid rates of mitochondrial DNA sequence evolution?. The Herpetological Journal, 16(3), 291-295.J
Editora
British Herpetological Society