keywords: Dadin-Kowa, Reservoir, physicochemical parameters, variations, correlation
This study was conducted to determine the monthly variation in some physico-chemical parameters in Dadin-Kowa reservoir. The water, electrical conductivity, total dissolved solids, and pH were measured by Hanna conductivity meter model EC 215 and pH meter model H198107. The water temperature, waterdepth, transparency, dissolved oxygen (DO), biochemical oxygen demand (BOD), carbon dioxide and water hardness were determined using standard methods. One-Way Analysis of Variance (ANOVA) was used to test for significant differences in means of the physicochemical factors among stations and Duncan’s Multiple Range Test (DMRT) was used to separate the means where significant differences exist. Correlation coefficient was used to determine the relationships between physicochemical factors. There was high significant (P ≤ 0.05) variation in the physico-chemical parameters with months in the reservoir except for water depth, carbon dioxide and hardness. There was high positive association between BOD and DO (r =1.00) and between carbon dioxide with EC and TDS (r = 0.80). Temperature showed moderate significant positive relationship with carbon dioxide, BOD and DO. A positive and significant association was observed between TDS and EC. Water depth was found to significant negative association with temperature, EC, BOD, TDS, DO and carbon dioxide.The study revealed marked monthly variation in the physicochemical factorsin the reservoir. It is hereby recommended that regular monitoring of the physicochemical parameters of water and sustainable management of the fisheries resources of the reservoir be encouraged.
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