Present address: Laboratório de Farmacologia, Instituto de Ciências Biológicas, Universidade Federal do Pará, Campus do Guamá, Av. Augusto Côrrea, 01, 66075-110 Belém (PA), Brazil.
Genetic structure of the diploid–polyploid fish Squalius alburnoides in southern Iberian basins Tejo and Guadiana, based on microsatellites
Article first published online: 26 NOV 2007
2007 The Fisheries Society of the British Isles
Journal of Fish Biology
Volume 71, Issue Supplement sc, pages 423–436, December 2007
How to Cite
Crespo-López, M. E., Pala, I., Duarte, T. L., Dowling, T. E. and Coelho, M. M. (2007), Genetic structure of the diploid–polyploid fish Squalius alburnoides in southern Iberian basins Tejo and Guadiana, based on microsatellites. Journal of Fish Biology, 71: 423–436. doi: 10.1111/j.1095-8649.2007.01688.x
- Issue published online: 26 NOV 2007
- Article first published online: 26 NOV 2007
- (Received 16 November 2006, Accepted 16 August 2007)
- hybrid complex;
Several studies have demonstrated the hybrid origin of Squalius alburnoides, a complex of diploid, triploid and tetraploid fish, with Squalius pyrenaicus as the maternal ancestor and an Anaecypris hispanica-like species as the paternal ancestor. The aim of this study was to assess patterns of genetic diversity and similarity between sympatric forms of the different ploidy levels of S. alburnoides and related parental species in the two largest basins that are part of its southern Iberian distribution, the Tejo and Guadiana, using microsatellites. High levels of genetic diversity were found in populations of S. alburnoides from both basins, reflecting the hybrid origin, the high diversity of forms in these river basins and the different modes of reproduction of the complex. Microsatellites indicated low values of genetic differentiation between the non-hybrid all-male form of S. alburnoides and A. hispanica, supporting the view that these forms share a common ancestor. In some instances, diploid and triploid hybrids from the same river basin were more closely related to each other than to their counterparts in the other basins, suggesting an ancient origin for the complex in these Iberian southern basins.