Abstracts (first author)
Plio-Pleistocene effects on the phylogeny, phylogeography and historical evolution of freshwater fish species Luciobarbus sclateri (Teleostei, Cyprinidae) in the western Mediterranean region
The Iberian Peninsula has been traditionally considered as glacial refugia, since glaciers were limited to mountain areas. The concept of refugia is linked to population reduction during cooler periods and expansion once the climate turns back to mild temperatures. In the case of continental icthyofauna, the postglacial spreading is strongly conditioned by the hydrogeographical configuration and could affect the phylogeographic structure throughout time, due not only to its low dispersal power but also to a reduced effective population size. Currently, these refugia are considered heterogeneous and refugia within refugia have been proposed. One of the species used as a model to assess this approach has been the barbel species Luciobarbus sclateri (Günther, 1868), which is an endemism of Iberian Peninsula southern rivers. Thereby, this study aims to know which effects have climatic changes during Plio-Pleitocene on Luciobarbus sclateri, as well as trying to explain, through genetic data, why this species is clearly dominant in those freshwater fish communities where it is distributed. Our hypothesis is that its particular biology and ecological tolerance have resulted to a high genetic variability and scarce population structure. So far, others studies only have dealt with mitochondrial gene, due to the problems related to tetraploidy. Therefore, we analyze mitochondrial and nuclear genes to infer the species tree and its phylogeographical structure, as well as estimate time of the historical processes leading to the evolutionary history of this Iberian endemism.