Anthropogenic impacts on the contextual morphological diversification and adaptation of Nile tilapia (Oreochromis niloticus, L. 1758) in East Africa

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dc.contributor.authorDias Tibihika, Papius
dc.contributor.authorWaidbacher, Herwig
dc.contributor.authorMasembe, Charles
dc.contributor.authorCurto, Manuel
dc.contributor.authorSabatino, Stephen
dc.contributor.authorAlemayehu, Esayas
dc.contributor.authorMeulenbroek, Paul
dc.contributor.authorAkoll, Peter
dc.contributor.authorMeimberg, Harald
dc.date.accessioned2022-12-27T16:51:56Z
dc.date.available2022-12-27T16:51:56Z
dc.date.issued2018
dc.description.abstractNile tilapia occurs naturally in East Africa where it’s an economically important species. Many of the natural populations of Nile tilapia have been affected by anthropogenic activities including translocations, associated with programmes aimed at enhancing capture fisheries and aquaculture productivity. Using geometric morphometric analyses, we tested the hypothesis that such anthropogenic activities have augmented admixture among natural populations of Nile tilapia and influenced the geographical distribution of morphological variation within the species. Our expectation was that Nile tilapia shape divergent might be consistent with reportedly anthropogenic activities in nonnative environments. To test this hypothesis, we analyzed the shapes of 490 individuals from thirteen populations; three farms, six natives and four nonnative natural populations. Our analysis revealed that the most pronounced shape diversification was observed in seven populations; three nonnatives (Victoria, Kyoga and Sindi farm) and four natives (Albert, River Nile, George and Turkana). The features responsible for the observed morphotypes were mainly related to the orientation of the anterior region of the fish and may be due to diversifying selection in response to new environmental pressures (for nonnative populations), admixture or drift. Shape change in the nonnative high-altitude populations was unexpectedly conserved, suggesting recent introductions which may have not resulted in admixture or there was strong selection against change in the traits measured. On the other hand, the recorded morphotypic clusters explained the possible genetic link to their putative ancestral home. Our results were partially consistent with our prediction that the nonnative populations exhibited divergent morphotypes. We recommend further investigations with molecular genetics for followup of these findings.en_US
dc.identifier.citationTibihika, P. D., Waidbacher, H., Masembe, C., Curto, M., Sabatino, S., Alemayehu, E., ... & Meimberg, H. (2018). Anthropogenic impacts on the contextual morphological diversification and adaptation of Nile tilapia (Oreochromis niloticus, L. 1758) in East Africa. Environmental Biology of Fishes, 101(3), 363-381. https://doi.org/10.1007/s10641-017-0704-0en_US
dc.identifier.urihttps://doi.org/10.1007/s10641-017-0704-0
dc.identifier.urihttps://nru.uncst.go.ug/handle/123456789/6651
dc.language.isoenen_US
dc.publisherEnvironmental Biology of Fishesen_US
dc.subjectNile tilapiaen_US
dc.subjectGeometric morphometricsen_US
dc.subjectMorphoJen_US
dc.subjectPopulationsen_US
dc.subjectCondition factoren_US
dc.subjectMorphological diversificationen_US
dc.titleAnthropogenic impacts on the contextual morphological diversification and adaptation of Nile tilapia (Oreochromis niloticus, L. 1758) in East Africaen_US
dc.typeArticleen_US
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