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Reading the history of a hybrid fish complex from its molecular record
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Orientador(es)
Resumo(s)
Squalius alburnoides is a widely distributed intergeneric hybrid complex with fish of both sexes, varying ploidy levels and proportions
of the parental genomes. Its dispersal routes were here delineated and framed by the reconstruction of the phylogeny and phylogeography
of other Squalius with which it hybridizes, based on the available data on the paleohydrographical history of the Iberian Peninsula.
Results based on sequences of cytochrome b and beta-actin genes showed that: proto-Squalius pyrenaicus originated at least five species
as it dispersed throughout the Iberian Peninsula in the Mio-Pliocene; the S. alburnoides complex likely had a single origin in the bulk of
Iberia, in the Upper Tagus/Guadiana area, when hydrographical rearrangements allowed the contact between its ancestors (around
700,000 years ago); interspecific crosses allowed the introgression of mitochondrial and nuclear genes of S. alburnoides in allopatric species/
populations of other Squalius and vice-versa; and reconstituted S. alburnoides non-hybrid males may contribute to the replacement
of the typical mtDNA of the complex (in the populations where they occur, crosses with females of other Squalius seem to have been
especially frequent). A number of dispersal events and colonization routes are proposed.
Descrição
Palavras-chave
Squalius alburnoides Hybrid complex Introgression Paleobiogeography Iberia
Contexto Educativo
Citação
Molecular Phylogenetics and Evolution, 45, 981-996