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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Genetic structure and gene flow in an endangered native tilapia fish (Oreochromis esculentus) compared to invasive Nile tilapia (Oreochromis niloticus) in Yala swamp, East Africa
Conservation Genetics, Volume 12, No. 1, Year 2011
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Description
The introduction of invasive Nile tilapia (Oreochromis niloticus), and the rapacious predator Nile perch (Lates niloticus), into Lake Victoria resulted in a decline in population sizes, genetic diversity and even extirpation of native species which were previously the mainstay of local fisheries. However, remnant populations of native fish species, including tilapia, still persist in satellite lakes around Lake Victoria where they may coexist with O. niloticus. In this study we assessed population genetic structure, diversity, and integrity of the native critically endangered Singidia tilapia (O. esculentus) in its refugial populations in the Yala swamp, Kenya, and contrasted this diversity with populations of the invasive tilapia O. niloticus in satellite lakes (Kanyaboli, Namboyo and Sare) and Lake Victoria. Based on mtDNA control region sequences and eight nuclear microsatellite loci, we did not detect any mtDNA introgression between the native and the invasive species in Lakes Kanyaboli and Namboyo, but did find low levels of nuclear admixture, primarily from O. niloticus to O. esculentus. Some genetic signal of O. esculentus in O. niloticus was found in Lake Sare, where O. esculentus is not found, suggesting it has recently been extirpated by the O. niloticus invasion. In both species, populations in the satellite lakes are significantly genetically isolated from each other, with private mtDNA haplotypes and microsatellite alleles. For O. niloticus, genetic diversity in satellite lakes was similar to that found in Lake Victoria. Our data imply a low frequency of immigration exchange between the two populations of O. esculentus and we suggest that the populations of this endangered species and important fisheries resource should be conserved separately in Lakes Kanyaboli and Namboyo and with high priority. © 2010 Springer Science+Business Media B.V.
Authors & Co-Authors
Ang’ienda, Paul Oyieng’
Kenya, Maseno
Maseno University
Germany, Konstanz
Universität Konstanz
Lee, Hyuk Je
Germany, Konstanz
Universität Konstanz
Elmer, Kathryn R.
Germany, Konstanz
Universität Konstanz
Abila, Romulus
Kenya, Nairobi
South Eastern Kenya University
Waindi, Eliud Nyandago
Kenya, Maseno
Maseno University
Meyer, Axel
Germany, Konstanz
Universität Konstanz
Statistics
Citations: 60
Authors: 6
Affiliations: 3
Identifiers
Doi:
10.1007/s10592-010-0136-2
ISSN:
15660621
e-ISSN:
15729737
Research Areas
Cancer
Genetics And Genomics
Study Design
Cross Sectional Study
Study Locations
Multi-countries
Kenya