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Preliminary insight into the age and origin of the Labeobarbus fish species flock from Lake Tana (Ethiopia) using the mtDNA cytochrome b gene.

Abstract：

:The high diversity of Cyprinid fish in Ethiopia's Lake Tana appears to be an example of ecological differentiation and assortative mating leading to rapid sympatric speciation. Lake Tana's Labeobarbus species flock consists of 15 morphological and ecological distinct species. This is the first attempt to determine the age and origin and inter-species relationships of Lake Tana's Labeobarbus species using the mtDNA cytochrome b gene. Analysis of cytchrome b sequences shows that Lake Tana's species flock appears to be young but the present dataset did not unequivocally support monophyly of Lake Tana's species. Additional markers are needed to determine whether Lake Tana's labeobarbs originated from a single or multiple incursion(s) of ancestral L. intermedius in the Lake Tana drainage basin, or the disruption of an ancient continuous riverine population by the emergence of the Tissisat waterfalls. Adaptive radiation and speciation within Lake Tana's Labeobarbus species flock may have occurred in the last 10,000-25,000years, following the desiccation of Lake Tana around 17,000years ago, at the same time as Lake Victoria, however, obtaining more data using other (nuclear) markers is urgently required.

journal_name

Mol Phylogenet Evol

journal_title

Molecular phylogenetics and evolution

authors

de Graaf M,Megens HJ,Samallo J,Sibbing F

doi

10.1016/j.ympev.2009.10.029

subject

Has Abstract

pub_date

2010-02-01 00:00:00

pages

336-43

issue

2

eissn

1055-7903

issn

1095-9513

pii

S1055-7903(09)00423-0

journal_volume

54

pub_type

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