Impoundment impact on the morphology of Brycinus macrolepidotus (Characiformes: Alestidae) Populations in the Osun River, Nigeria


  • Tofunmi Oladimeji Department of Zoology, Obafemi Awolowo University, Ile-Ife
  • Henry Adewole Obafemi Awolowo University, Ile-Ife
  • Sodiq Olagunju Obafemi Awolowo University, Ile-Ife
  • Olamide Ogunribido



Dam, Environmental Conditions, Meristic, Morphology, River


River impoundment has constituted a major disturbance to aquatic ecosystems worldwide by transforming rivers into reservoirs; this in turn has resulted in adaptive changes in the morphology of native species. To determine the potential effect of impoundment on the morphological characters of Brycinus macrolepidotus, the morphological variation between its populations associated with the river and reservoir areas along the Osun River was compared. In total, eighty (80) specimens were collected from the study areas and measured using standard procedures. Statistical procedures such as the student T-test, and principal component analysis (PCA) were performed on the morphometric and meristic data using SPSS and PAST software respectively. The T-test analyses revealed that the body depth, snout length, eye diameter, pelvic fin length, pre-anal length, pectoral-fin ray, pelvic-fin ray, and scales above the lateral line varied significantly (P<0.05) between the two populations. However, the PCA comparing the two populations revealed low differentiation for most characters. The observed changes in some morphological features between Brycinus macrolepidotus populations have implications for the adaptation of the fishes to the environmental changes imposed by the impoundment of the Osun River


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How to Cite

Oladimeji, T., Adewole, H., Olagunju, S., & Ogunribido, O. (2023). Impoundment impact on the morphology of Brycinus macrolepidotus (Characiformes: Alestidae) Populations in the Osun River, Nigeria. Genetics & Biodiversity Journal, 7(2), 130–140.



Original Article