Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.12/1424
Título: Phylogeography and evolution of the triplefin Tripterygion delaisi (Pisces, Blennioidei)
Autor: Domingues, Vera dos Santos
Almada, Vítor Carvalho
Santos, Ricardo Serrão
Brito, Alberto
Bernardi, Giacomo
Data: 2007
Editora: Springer
Citação: Marine Biology, 150,509-519
Resumo: The genus Tripterygion (Risso 1826) is restricted to the eastern Atlantic and the Mediterranean, and comprises only three species. T. melanuros and T. tripteronotus are essentially endemic to the Mediterranean, while Tripterygion delaisi occurs in the Atlantic and in the Mediterranean. Two subspecies of T. delaisi have been described (T. d. xanthosoma in the Mediterranean and T. d. delaisi in the Atlantic). Several scenarios have been proposed for the evolution of T. delaisi subspecies, but so far its subspeciation process is not clear. In this study we present a population survey of T. delaisi including specimens from the two recognized subspecies. We combined a phylogeographic approach with estimates of the direction of migration (between the Atlantic and the Mediterranean) and of the coalescence time of the two subspecies, using polymorphic mitochondrial and nuclear genes. The results of this study clearly support the existence of two Tripterygion delaisi clades, one in the eastern Atlantic islands and another in the Atlantic coasts of Europe and in the Mediterranean. Historical migration between the islands and Western Europe plus Mediterranean was restricted, and showed a westbound trend, with a higher number of migrants going from the Western Europe plus Mediterranean into the islands. We estimated the time of coalescence of both groups of T. delaisi to be more recent than the onset of Pleistocene glaciations (1.7 Mya). Our results are consistent with previous hypothesis that consider successive dispersal events of a Tripterygion ancestor from the western African coast colonizing the Atlantic islands and the Mediterranean, promoting the evolutionary divergence between these areas.
Peer review: yes
URI: http://hdl.handle.net/10400.12/1424
ISSN: 0025-3162
Aparece nas colecções:UIE-E - Artigos em revistas internacionais

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