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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
biochemistry, genetics and molecular biology
Genetic variation and demographic history of the Haplochromis laparogramma group of Lake Victoria-An analysis based on SINEs and mitochondrial DNA
Gene, Volume 450, No. 1-2, Article 36642, Year 2010
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Description
More than 500 endemic haplochromine cichlid species inhabit Lake Victoria. This striking species diversity is a classical example of recent explosive adaptive radiation thought to have happened within the last ~15,000 years. In this study, we examined the population structure and historical demography of 3 pelagic haplochromine cichlid species that resemble in morphology and have similar niche, Haplochromis (Yssichromis) laparogramma, Haplochromis (Y.) pyrrhocephalus, and Haplochromis (Y.) sp. "glaucocephalus". We investigated the sequences of the mitochondrial DNA control region and the insertion patterns of short interspersed elements (SINEs) of 759 individuals. We show that sympatric forms are genetically differentiated in 4 of 6 cases, but we also found apparent weakening of the genetic differentiation in areas with turbid water. We estimated the timings of population expansion and species divergence to coincide with the refilling of the lake at the Pleistocene/Holocene boundary. We also found that estimates can be altered significantly by the choice of the shape of the molecular clock. If we employ the nonlinear clock model of evolutionary rates in which the rates are higher towards the recent, the population expansion was dated at around the event of desiccation of the lake ca. 17,000 YBP. Thus, we succeeded in clarifying the species and population structure of closely related Lake Victoria cichlids and in showing the importance of applying appropriate clock calibrations in elucidating recent evolutionary events. © 2009 Elsevier B.V. All rights reserved.
Authors & Co-Authors
Mzighani, Semvua Isa
Japan, Tokyo
Tokyo Institute of Technology
Tanzania, Dar es Salaam
Tanzania Fisheries Research Institute Tafiri
Nikaido, Masato
Japan, Tokyo
Tokyo Institute of Technology
Takeda, Miyuki
Japan, Fukuoka
Kyushu University
Seehausen, Ole
Switzerland, Bern
University of Bern
Switzerland, Dubendorf
Eawag - Swiss Federal Institute of Aquatic Science and Technology
Budeba, Y.
Tanzania, Dar es Salaam
Tanzania Fisheries Research Institute Tafiri
Ngatunga, Benjamin P.
Tanzania, Dar es Salaam
Tanzania Fisheries Research Institute Tafiri
Katunzi, Egid F.B.
Tanzania, Dar es Salaam
Tanzania Fisheries Research Institute Tafiri
Aibara, Mitsuto
Japan, Tokyo
Tokyo Institute of Technology
Mizoiri, Shinji
Japan, Tokyo
Tokyo Institute of Technology
Sato, Tetsu
Japan, Ueda
Nagano University
Tachida, Hidenori
Japan, Fukuoka
Kyushu University
Okada, Norihiro
Japan, Tokyo
Tokyo Institute of Technology
Statistics
Citations: 22
Authors: 12
Affiliations: 6
Identifiers
Doi:
10.1016/j.gene.2009.10.002
ISSN:
03781119
Research Areas
Cancer
Environmental
Genetics And Genomics
Study Design
Cross Sectional Study