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| Títulos: | Relationships of Afroablepharus Greer, 1974 skinks from the Gulf of Guinea islands based on mitochondrial and nuclear DNA:Patterns of colonization and comments on taxonomy |
| Autores: | Jesus, José
Brehm, António
Harris, D. James |
| Palavras Chaves: | 12S rDNA
16S rDNA
Cytochrome b
C-mos
Panaspis
Afroablepharus
Gulf of Guinea
São Tome
Príncipe
Annobon |
| Datas: | 31-Aug-2007 |
| Publicações: | Elsevier, Inc |
| Citaçã: | Molecular Phylogenetics and Evolution 45 (2007) 904–914 |
| Série / Relatório no.: | 45 |
| Resumo: | Partial sequences of three mitochondrial DNA genes, 12S rDNA, 16S rDNA and cytochrome b, and one nuclear gene, c-mos, were
used to assess the phylogenetic relationships of species belonging to the genus Afroablepharus from the volcanic islands of the Gulf of
Guinea (West Africa) and neighboring continental Africa. Additionally, partial sequences of cytochrome b were used to compare levels
of sequence divergence within populations. The three forms from Sa˜o Tome´, Prı´ncipe and Annobon (one per island) are genetically distinct,
with high levels of divergence, supporting the recognition of a distinct species in each island. Populations within each island contain
very low levels of genetic diversity. These three forms form a monophyletic group suggesting a single initial colonization followed by
radiation to the other islands, possibly from Sa˜o Tome´ to Prı´ncipe and Annobon. This is contrary to what was found in other reptiles
from these islands such as Mabuya (sensu lato) and Hemidactylus, which colonized the islands multiple times. Assuming a molecular
clock for cytochrome b of about 2% divergence per million years (usually applied to Sauria), the lineage on Annobon island exceeds
the age of the island, thus casting further doubt on this widely used divergence estimate.
Partial sequences of c-mos showed no variation within islands. Five to seven sites were variable among islands, which is a high value
further supporting the treatment of each island form as a distinct species. |
| URI: | http://hdl.handle.net/123456789/193 |
| Aparece na Colecção: | Artigos em Revistas
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