Genetic diversity of Nile tilapia (Oreochromis niloticus) populations in Ethiopia: insights from nuclear DNA microsatellites and implications for conservation
Open Access
- 7 June 2021
- journal article
- research article
- Published by Springer Science and Business Media LLC in BMC Ecology and Evolution
- Vol. 21 (1), 1-14
- https://doi.org/10.1186/s12862-021-01829-2
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.Keywords
This publication has 58 references indexed in Scilit:
- An overview of STRUCTURE: applications, parameter settings, and supporting softwareFrontiers in Genetics, 2013
- Study on the Adaptability Status and Reproductive Success of Oreochromis niloticus L. (Pisces: Cichlidae) and Carp (Cyprinus carpio L., 1758) in a Tropic Reservoir (Fincha, Ethiopia)International Journal of Aquaculture, 2012
- STRUCTURE HARVESTER: a website and program for visualizing STRUCTURE output and implementing the Evanno methodConservation Genetics Resources, 2011
- Spatial and temporal variation in population genetic structure of wild Nile tilapia (Oreochromis niloticus) across AfricaBMC Genomic Data, 2011
- Compromising genetic diversity in the wild: unmonitored large-scale release of plants and animalsTrends in Ecology & Evolution, 2010
- genalex 6: genetic analysis in Excel. Population genetic software for teaching and researchMolecular Ecology Notes, 2005
- Detecting the number of clusters of individuals using the software structure: a simulation studyMolecular Ecology, 2005
- Evolution of the Main Ethiopian Rift in the frame of Afar and Kenya rifts propagationTectonics, 2005
- Genetic differentiation among natural populations of the Nile tilapia Oreochromis niloticus (Teleostei, Cichlidae)Heredity, 1997
- Identification of the subspecies of Oreochromis niloticus (Pisces: Cichlidae) using restriction endonuclease analysis of mitochondrial DNAAquaculture, 1992