caa a22 4500 44585698X CHVBK 20180317145431.0 cr unu---uuuuu 170323e20110201xx s 000 0 eng 10.1007/s10592-010-0136-2 doi (NATIONALLICENCE)springer-10.1007/s10592-010-0136-2 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 [Elektronische Daten] [Paul Angienda, Hyuk Lee, Kathryn Elmer, Romulus Abila, Eliud Waindi, Axel Meyer] 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. Springer Science+Business Media B.V., 2010 Admixture nationallicence Lake Victoria basin nationallicence Nile tilapia nationallicence Population genetic structure nationallicence Singidia tilapia nationallicence Yala swamp nationallicence Angienda Paul Department of Zoology, Maseno University, P.O. Box 333, Maseno, Kenya aut Lee Hyuk Lehrstuhl für Zoologie und Evolutionsbiologie, Department of Biology, University of Konstanz, Universitätstrasse 10, 78457, Konstanz, Germany aut Elmer Kathryn Lehrstuhl für Zoologie und Evolutionsbiologie, Department of Biology, University of Konstanz, Universitätstrasse 10, 78457, Konstanz, Germany aut Abila Romulus Department of Hydrology and Water Resources Management, South Eastern University College, P.O. Box 170-90200, Kitui, Kenya aut Waindi Eliud Department of Zoology, Maseno University, P.O. Box 333, Maseno, Kenya aut Meyer Axel Lehrstuhl für Zoologie und Evolutionsbiologie, Department of Biology, University of Konstanz, Universitätstrasse 10, 78457, Konstanz, Germany aut Conservation Genetics Springer Netherlands 12/1(2011-02-01), 243-255 1566-0621 12:1<243 2011 12 10592 https://doi.org/10.1007/s10592-010-0136-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10592-010-0136-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Angienda Paul Department of Zoology, Maseno University, P.O. Box 333, Maseno, Kenya aut NATIONALLICENCE 700 1- Lee Hyuk Lehrstuhl für Zoologie und Evolutionsbiologie, Department of Biology, University of Konstanz, Universitätstrasse 10, 78457, Konstanz, Germany aut NATIONALLICENCE 700 1- Elmer Kathryn Lehrstuhl für Zoologie und Evolutionsbiologie, Department of Biology, University of Konstanz, Universitätstrasse 10, 78457, Konstanz, Germany aut NATIONALLICENCE 700 1- Abila Romulus Department of Hydrology and Water Resources Management, South Eastern University College, P.O. Box 170-90200, Kitui, Kenya aut NATIONALLICENCE 700 1- Waindi Eliud Department of Zoology, Maseno University, P.O. Box 333, Maseno, Kenya aut NATIONALLICENCE 700 1- Meyer Axel Lehrstuhl für Zoologie und Evolutionsbiologie, Department of Biology, University of Konstanz, Universitätstrasse 10, 78457, Konstanz, Germany aut NATIONALLICENCE 773 0- Conservation Genetics Springer Netherlands 12/1(2011-02-01), 243-255 1566-0621 12:1<243 2011 12 10592 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer