Genetic diversity of Nile tilapia (Oreochromis niloticus) populations in Ethiopia: insights from nuclear DNA microsatellites and implications for conservation.

BMC Ecology and Evolution
Genanaw TesfayeHarald Meimberg

Abstract

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. 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. 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 biodiver...Continue Reading

References

Dec 8, 2006·Molecular Biology and Evolution·Marie-Pierre Chapuis, Arnaud Estoup
Jan 15, 2010·Molecular Ecology·David G RobertsDavid J Ayre
Jun 12, 2013·Frontiers in Genetics·Liliana Porras-HurtadoMaria V Lareu
Jan 2, 2015·Evolutionary Applications·Katherine A HarrissonPaul Sunnucks
Feb 17, 2015·Molecular Ecology Resources·Naama M KopelmanItay Mayrose
Nov 16, 2019·Scientific Reports·Curtis E LindAboubacar Toguyeni

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Software Mentioned

Illumina
Phython
STRUCTURE HARVESTER
GenAlEx
UPGMA
STRUCTURE
Hashenge
Populations
FreeNA

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