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Título: Discus fishes: mitochondrial DNA evidence for a phylogeographic barrier in the Amazonian genus Symphysodon (Teleostei: Cichlidae)
Autor(es): J. S. Ready
Sven Oscar Kullander
Efrem Jorge Gondim Ferreira
Assunto: Amazônia
DNA mitocondrial
geographical variation
ISSN: 0022-1112
Revista: Journal of Fish Biology
Volume: 69
Resumo: Genetic relationships and variation in meristic counts, body shape and colour were examined in a large sample of Symphysodon collected from several locations in floodplain habitats along the length of the Amazon River. Surprisingly, mitochondrial DNA indicates no difference between the two historically described species, Symphysodon discus and Svmphysodon aequifasciatus, but shows that non-clinal variation exists with a distinct lineage found in the western Amazon. This lineage is consistent with a colour form that is distinct from other Symphysodon lineages. This form has a parapatric distribution and is recognized as a distinct species, Symphysodon tarzoo. Adaptation to floodwater habitats supports genetic cohesion across a large range preventing fine scale regional diversification of the genus. Possible explanations for the unusual set of distributions for genetic and colour characters relate to the history of the Amazon basin and the probable division of lowland species when submerged geologic arches influence surface topology. (c) 2006 The Authors Journal compilation (c) 2006 The Fisheries Society of the British Isles.
ISSN: 0022-1112
Aparece nas coleções:Coordenação de Biodiversidade (CBIO)

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