DNA barcoding reveals micro-evolutionary changes and river system-level phylogeographic resolution of African silver catfish, Schilbe intermedius (Actinopterygii: Siluriformes: Schilbeidae) from seven populations across different African river

• Autorzy: Van der Bank H.F. , Greenfield R. , Daru B. H. , Yessoufou K.
• Języki publikacji: EN

Abstrakty

EN

Background. Under the tropics, less than 40% of known fishes are identified to species-level. Further, the ongoing global change poses unprecedented threat to biodiversity, and several taxa are likely to go extinct even before they could be described. Traditional ecological theory suggests that species would escape extinction risk posed by global threats (e.g., climate change) only by migrating to new environments. In this study, we hypothesise that micro-evolutionary changes (evolution within species and populations) are also important mechanisms for the survival of Schilbe intermedius in Africa, a continent subjected to uneven distribution of climate severity. Materials and Methods. Using the mitochondrial cytochrome c oxidase subunit I (COI) gene, known as animal DNA barcode, we tested this hypothesis by analysing the genetic diversity and phylogenetic relations between seven populations of S. intermedius across different African river systems. Results. We reveal a clear geographical patterning in genetic variations, with three clear clusters (southern Africa, eastern Africa, and western Africa). In southern Africa, the South African population is distinct from that of Namibia and Botswana. In addition, within Nigerian populations of silver catfish, two sub-clusters emerged from two isolated river systems. We suggest that the phylogeographic pattern within African silver catfish populations mirror the past effects of selection and gene flow, and that the split within Nigerian silver catfish populations might be the result of micro-evolutionary adaptive responses to local selection pressures. Conclusion. We suggest that the strong genetic difference in African silver catfish among geographically isolated river systems might be the result of in situ micro-evolutionary adaptive responses to changing environments, and that DNA barcode has potential beyond species delimitation.

• Wydawca: -
• Czasopismo: Acta Ichthyologica et Piscatoria
• Rocznik: 2012
• Tom: 42
• Numer: 4
• Opis fizyczny: p.307–320,fig.,ref.

Twórcy

autor

Van der Bank H.F.

• Department of Zoology, African Centre for DNA Barcoding (ACDB), Kingsway Campus, P.O.Box 524, Auckland Park, 2006, Republic of South Africa

autor

Greenfield R.

• Department of Zoology, African Centre for DNA Barcoding (ACDB), Kingsway Campus, P.O.Box 524, Auckland Park, 2006, Republic of South Africa

autor

Daru B. H.

• Department of Botany and Plant Biotechnology, University of Johannesburg, African Centre for DNA Barcoding (ACDB), Kingsway Campus, P.O.Box 524, Auckland Park, 2006, Republic of South Africa

autor

Yessoufou K.

• Department of Botany and Plant Biotechnology, University of Johannesburg, African Centre for DNA Barcoding (ACDB), Kingsway Campus, P.O.Box 524, Auckland Park, 2006, Republic of South Africa

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