Contrasting genetic patterns and population histories in three threatened redfin species (Cyprinidae) from the Olifants River system, western South Africa

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Differentiation occurred in different areas of the same river system in Pseudobarbus phlegethon and two sister species of the serrated redfin lineage (Barbus calidus and Barbus erubescens) of the Western Cape region of South Africa. In an analysis of 27 allozyme loci a deep divergence was found within P. phlegethon between the Olifants and Doring catchments (seven fixed allelic differences; 0·338 < D < 0·366; FST = 0·925). In contrast, speciation in the serrated redfin lineage occurred within the Doring catchment between B. calidus and B. erubescens(one fixed allelic difference; 0·008 < D < 0·052; FST = 0·760). Different niche preferences, behaviour and morphology probably played an important role in the formation of these contrasting patterns of genetic structure and suggest that B. calidus may have been better able to disperse between the Olifants and Doring catchments (no fixed allelic differences; 0 < D < 0·040; FST = 0·281) than P. phlegethon.

Keywords: Barbus; Pseudobarbus; allozymes; geographic structure; population genetics

Document Type: Regular Paper


Affiliations: Department of Zoology, Private Box X1, Matieland, University of Stellenbosch, 7601, South Africa

Publication date: May 1, 2004

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