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Mitochondrial DNA phylogeography of the Labeobarbus intermedius complex (Pisces, Cyprinidae) from Ethiopia
Author(s) -
Beshera K. A.,
Harris P. M.
Publication year - 2014
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/jfb.12408
Subject(s) - biology , phylogeography , cytochrome b , mitochondrial dna , maximum parsimony , monophyly , zoology , evolutionary biology , phylogenetic tree , species complex , coalescent theory , markov chain monte carlo , dna barcoding , ecology , bayesian probability , genetics , clade , gene , statistics , mathematics
Mitochondrial DNA phylogeography of populations of the Labeobarbus intermedius complex (hexaploid barb) was investigated using 88 complete and 71 partial cytochrome b ( cytb ) sequences originating from 21 localities in five major drainages in Ethiopia and two localities in northern Kenya. The samples included 14 of the 15 Labeobarbus species described from Lake Tana. Discrete phylogeographic analyses of 159 cytb sequences employing Bayesian Markov Chain Monte Carlo ( MCMC ) simulations using Bayesian evolutionary analysis by sampling trees (BEAST) supported the monophyly of the L. intermedius complex, including the Lake Tana species. This analysis, in combination with statistical parsimony analysis, identified two mitochondrial DNA lineages within the complex. Divergence dating employing coalescent simulations suggested that the geographic split in the L. intermedius complex that led to the formation of these lineages occurred during the Pleistocene ( c . 0·5 M b.p. ), consistent with the timing of volcano‐tectonic events postulated to have shaped the current landscape of East Africa.