Genanaw Tesfaye1, Manuel Curto2,3, Paul Meulenbroek4,5, Gernot K Englmaier6, Papius Dias Tibihika7, Esayas Alemayehu8, Abebe Getahun9, Harald Meimberg2. 1. EIAR - National Fisheries and Other Aquatic Life Research Center, P.O. Box 64, Sebeta, Ethiopia. bubuwiwi2008@gmail.com. 2. Institute for Integrative Nature Conservation Research, University of Natural Resources and Life Sciences, Vienna, Gregor Mendel-Straße 33, 1180, Vienna, Austria. 3. MARE-Marine and Environmental Sciences Centre, Universidade de Lisboa, Lisbon, Portugal. 4. Institute of Hydrobiology and Aquatic Ecosystem Management (IHG), University of Natural Resources and Life Sciences, Vienna, Gregor-Mendel Straße 33, 1180, Vienna, Austria. paul.meulenbroek@boku.ac.at. 5. WasserCluster Lunz - biologische Station, Lunz am See, Dr. Carl Kupelwieser Prom. 5, 3293, Lunz/See, Austria. paul.meulenbroek@boku.ac.at. 6. University of Graz, Institute of Biology, Universitätsplatz 2, 8010, Graz, Austria. 7. National Environment Management Authority, P.O. Box 22255, Kampala, Uganda. 8. EIAR - National Fisheries and Other Aquatic Life Research Center, P.O. Box 64, Sebeta, Ethiopia. 9. Department of Zoological Sciences, Addis Ababa University, 1000, Addis Ababa, Ethiopia.
Abstract
BACKGROUND: Nile tilapia, Oreochromis niloticus (Linnaeus, 1758) is among the economically most important freshwater fish species in East Africa, and a major source of protein for local consumption. Human induced translocations of non-native stocks for aquaculture and fisheries have been found as a potential threat to the genetic diversity and integrity of local populations. In the present study, we investigate the genetic structure of O. niloticus from 16 waterbodies across Ethiopia using 37 microsatellite loci with SSR-GBAS techniques. RESULTS: The samples are structured into three main clusters shaped either by biogeographic factors or stocking activities. High FST values (Global FST = 0.438) between populations indicate a high level of genetic differentiation and may suggest long term isolation even within the same drainage systems. Natural populations of the Omo-Turkana system and the lakes in the Southern Main Ethiopian Rift showed the highest genetic variability while low variability was found in stocked populations of lakes Hora, Hashenge and Hayq. CONCLUSIONS: The results presented herein, may provide an essential basis for the management and conservation of the unique genetic resources in northern East Africa, and advance our understanding of biodiversity, phylogeny, evolution and development towards phylogenetically more accurate taxonomic classifications.
BACKGROUND:Nile tilapia, Oreochromis niloticus (Linnaeus, 1758) is among the economically most important freshwater fish species in East Africa, and a major source of protein for local consumption. Human induced translocations of non-native stocks for aquaculture and fisheries have been found as a potential threat to the genetic diversity and integrity of local populations. In the present study, we investigate the genetic structure of O. niloticus from 16 waterbodies across Ethiopia using 37 microsatellite loci with SSR-GBAS techniques. RESULTS: The samples are structured into three main clusters shaped either by biogeographic factors or stocking activities. High FST values (Global FST = 0.438) between populations indicate a high level of genetic differentiation and may suggest long term isolation even within the same drainage systems. Natural populations of the Omo-Turkana system and the lakes in the Southern Main Ethiopian Rift showed the highest genetic variability while low variability was found in stocked populations of lakes Hora, Hashenge and Hayq. CONCLUSIONS: The results presented herein, may provide an essential basis for the management and conservation of the unique genetic resources in northern East Africa, and advance our understanding of biodiversity, phylogeny, evolution and development towards phylogenetically more accurate taxonomic classifications.
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Authors: R A Coleman; B Gauffre; A Pavlova; L B Beheregaray; J Kearns; J Lyon; M Sasaki; R Leblois; C Sgro; P Sunnucks Journal: Heredity (Edinb) Date: 2018-01-12 Impact factor: 3.821
Authors: Manuel Curto; Silvia Winter; Anna Seiter; Lukas Schmid; Klaus Scheicher; Leon M F Barthel; Jürgen Plass; Harald Meimberg Journal: Ecol Evol Date: 2019-02-14 Impact factor: 2.912