keywords: Invertebrate, macrobenthic, metals
Heavy metal concentrations in water samples and macrobenthic invertebrate samples from Kubanni reservoir were investigated monthly between January and December, 2014 to determine the seasonal variation in heavy metal composition in the reservoir. Triplicate water samples were collected from 10 cm depth from three randomly selected sites into transparent amberedcoloured 250 ml reagent bottles. Macrobenthicinvertebrates were collected using an Ekman grab. Heavy metal concentrations of water samples and macrobenthic invertebrates were analysed using Air/Acetylene Flame Atomic Absorption Spectrophotometer (UNICAM 696 AA Spectrometer).Analysis of variance at P≤0.05 was used to analyse the result for heavy metal concentrations in macrobenthic invertebrates and students’t – test was used to compare the seasonal variation in heavy metal concentrations in benthic macroinvertebrates as well as in the water sample. Principal component analysis (PCA) was use to determine the interrelationship between heavy metals andmacrobenthic invertebrate composition. In Macrobenthic invertebrates, high concentration of Fe (46.21 mg/L) was recorded in Lumbriculid sp and low concentration of Cd (0.09 mg/L) was recorded in Lymneasp while in water samples, high concentration of Fe (86.84 mg/L) and low concentration of Cd (0.07 mg/L) were recorded respectively. Significant variations (P≤0.05) were observed in heavy metal concentrations inmacrobenthic invertebrateand water samples. Regular assessment of heavy metals in the reservoir should be carried out to monitor and track the trend of changes of its water quality and biodiversity.
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