Back to Search
Start Over
Molecular genetic diversity and differentiation of Nile tilapia (Oreochromis niloticus, L. 1758) in East African natural and stocked populations
- Source :
- BMC Evolutionary Biology, Vol 20, Iss 1, Pp 1-20 (2020), BMC Evolutionary Biology
- Publication Year :
- 2020
- Publisher :
- BMC, 2020.
-
Abstract
- BackgroundThe need for enhancing the productivity of fisheries in Africa triggered the introduction of non-native fish, causing dramatic changes to local species. In East Africa, the extensive translocation of Nile tilapia (Oreochromis niloticus) is one of the major factors in this respect. Using 40 microsatellite loci with SSR-GBS techniques, we amplified a total of 664 individuals to investigate the genetic structure ofO. niloticusfrom East Africa in comparison to Ethiopian and Burkina Faso populations.ResultsAll three African regions were characterized by independent gene-pools, however, the Ethiopian population from Lake Tana was genetically more divergent (Fst = 2.1) than expected suggesting that it might be a different sub-species. In East Africa, the genetic structure was congruent with both geographical location and anthropogenic activities (Isolation By Distance for East Africa, R2 = 0.67 and Uganda, R2 = 0.24).O. niloticusfrom Lake Turkana (Kenya) was isolated, while in Uganda, despite populations being rather similar to each other, two main natural catchments were able to be defined. We show that these two groups contributed to the gene-pool of different non-native populations. Moreover, admixture and possible hybridization with other tilapiine species may have contributed to the genetic divergence found in some populations such as Lake Victoria. We detected other factors that might be affecting Nile tilapia genetic variation. For example, most of the populations have gone through a reduction in genetic diversity, which can be a consequence of bottleneck (G-W, ConclusionsThe anthropogenic activities particularly in the East AfricanO. niloticustranslocations, promoted artificial admixture among Nile Tilapia populations. Translocations may also have triggered hybridization with the native congenerics, which needs to be further studied. These events may contribute to outbreeding depression and hence compromising the sustainability of the species in the region.
- Subjects :
- 0106 biological sciences
0301 basic medicine
Evolution
Population
Fisheries
Zoology
010603 evolutionary biology
01 natural sciences
Bottleneck
03 medical and health sciences
Nile tilapia
parasitic diseases
QH359-425
Animals
Uganda
education
Genetic erosion
Ecology, Evolution, Behavior and Systematics
Isolation by distance
education.field_of_study
Genetic diversity
biology
Genetic Variation
Cichlids
biology.organism_classification
Fish translocations
Kenya
Gene flow
Genetic divergence
Lakes
Oreochromis
Genetics, Population
030104 developmental biology
Genetic structure
Microsatellite Repeats
Research Article
Subjects
Details
- Language :
- English
- ISSN :
- 14712148
- Volume :
- 20
- Issue :
- 1
- Database :
- OpenAIRE
- Journal :
- BMC Evolutionary Biology
- Accession number :
- edsair.doi.dedup.....caf7ddfec09772bdfff1aac1e9bb37d7