IMPACT OF ALUMINIUM EXTRUSION EFFLUENTS ON PLANKTON AND FISH COMPOSITION OF MBAA RIVER, INYISHI, IMO STATE, NIGERIA
DOI:
https://doi.org/10.5281/zenodo.17036480Keywords:
Mbaa River, physicochemical parameters, biomarkers, water quaAbstract
The impact of aluminum extrusion effluent on Plankton and fish composition status of Mbaa River in Inyishi, Imo State of Nigeria was studied between June 2022 and April 2023. Three sampling stations were evaluated using plankton and fish composition biomarkers. Algal communities comprised of 6 phyla, 48 species and 4425 individuals. Spatially, the algae were more dominant in SS2 with 2592 individuals constituting 58.56% composition followed by SS3 (1050 individuals and 23.72%) and SS1 (784 specimens with 17.71%). The diatomic group (Chrysophyta) together with the phylum chryptophyta were significantly reduced (P < 0.05) in both biomass and diversity at the point source station while green algae (Chlorophyta) and the blue-green algae (Cyanophyta) were significantly more abundant (P < 0.05) at the point source than in other sampling stations. Shannon-Wiener's species diversity index was 3.350 at the point source station (SS2), 2.600 at the upstream station (SS1) and 2.750 at downstream station (SS3). Phytoplankton communities of Mbaa River exhibited both spatial and temporal variations. The zooplankton assemblage of the river comprised of 4 orders, 40 species and 2927 individuals. Spatially, zooplanktons were more predominant at the upstream station with 2017 individuals, constituting 69.70% by composition, and significantly higher (P<0.05) than in other stations. Fish assemblages of the river was composed of 19 families, 163 species and 10786 individuals. The most abundant families were the Characidae (19.76% by composition), Mochokidae (16.11%), Schilbeidae (13.57%), and Mormyridae (13.38%). Spatially, fish were more abundant and diverse at downstream location (SS3) with 7065 individuals, equivalent to 0.640 in relative abundance. The point source station was generally sparsely populated by fish both spatially and temporally. Shannon-Wiener's species diversity index was 1.280 (SS1), 0.890 (SS2) and 1.130 (SS3). The study made valuable contribution to knowledge by providing empirical data for environmentalist working on biodiversity conservation and aquatic ecosystem protection.
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