Phylogenetic relationships and phylogeography of the Killifish species of the subgenus Chromaphyosemion (Radda, 1971) in West Africa, inferred from mitochondrial DNA sequences

We have analyzed the phylogenetic relationships of 160 specimens from 88 samples representing all defined species of the African Aplocheiloid subgenus Chromaphyosemion in order to examine the monophyly of this group, the species interrelationships, and to reveal trends in chromosomal evolution and f...

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Published in:Molecular phylogenetics and evolution 2006-08, Vol.40 (2), p.332-346
Main Authors: Agnèse, J.-F., Zentz, F., Legros, O., Sellos, D.
Format: Article
Language:English
Subjects:
Africa, Western
Animals
Base Sequence
Biochemistry, Molecular Biology
Biogeography
Chromosomes - genetics
Cyprinodontidae
DNA, Mitochondrial - genetics
Genetic Variation - genetics
Geography
Killifishes - classification
Killifishes - genetics
Life Sciences
Mitochondrial DNA
Phylogeny
Population Dynamics
Refuge zone
Taxonomy
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Summary:We have analyzed the phylogenetic relationships of 160 specimens from 88 samples representing all defined species of the African Aplocheiloid subgenus Chromaphyosemion in order to examine the monophyly of this group, the species interrelationships, and to reveal trends in chromosomal evolution and formulate hypotheses about their evolutionary history. The data set comprised 1153 total nucleotides from the mitochondrial 12S rRNA, cytochrome oxidase I, and D-loop. The molecular-based topologies were analyzed by maximum parsimony, maximum likelihood, distance method and Bayesian inference support the monophyly of the subgenus Chromaphyosemion. All populations with ambiguous taxonomic status were assigned to an already described species except A. sp. Rio Muni which corresponds to a still undescribed species. Aphyosemion alpha and A. lugens were in basal position in the different trees that indicate a possible origin of the subgenus Chromaphyosemion in the South Cameroon–North Gabon region. Furthermore, the South Cameroon region (between 2° and 3° of North latitude) that accommodates half of the Chromaphyosemion species is considered to have been a refuge zone during the late quaternary dry events that Africa experienced. Phylogenetic relationships among the subgenus also revealed that chromosomal evolution is complex and should be studied at the intraspecific level.
ISSN:1055-7903
1095-9513
DOI:10.1016/j.ympev.2006.03.018