Title: Hydrobiology of Kodige Tank in the Western Ghats, India
Abstract: The water quality parameters such as dissolved oxygen (DO), biochemical oxygen demand (BOD), pH, solids, conductivity, turbidity, total hardness (TH), alkalinity, sulfate, silicate, magnesium, calcium, sodium, potassium, phosphate, nitrate, nitrogen and iron of Kodige tank water have been estimated. Water quality, plankton and fish diversity of Kodige tank near Narasimharajapura in the Western Ghats of Karnataka was studied for a period of one year from March 2002 to February 2003. The Principal Component Analysis (PCA) was applied to the water quality data revealed a total of 6 components which accounted for 93% of variance. The component 1 (nitrate, phosphate, silicate, sulphate, turbidity) accounted for 29.93% of total variance followed by component 2 (conductivity, total solids, dissolved solids, suspended solids, alkalinity) accounted for 18.19% and component 3 (BOD, DO, Ca, total hardness) accounted for 14.36%.The rest of the variance was contributed by other components 4-6 (water temperature, chloride, water temperature, pH, Na, K, Mg, Fe). The hierarchical cluster analysis using complete linkage showed 4 groups of water quality parameters. The tank has sufficient water for about 10 months from July to April and thereafter the water reaches below the outlet point. Water is used for irrigation and some other domestic purposes. A total of 22 species of plankton have been recorded. Phytoplankton species composed of Canthocamptus sp., Pleurodiscus sp., Monostroma quadernarium, Closterium striolata and Aphanocapsa sp. whereas the zooplankton species dominated by Cyclops strenuus, Cyclops sp. and Brachiodentatus sp. Fish diversity was composed of the species belonging to the family Cyprinidae (Berrilius canarensis, Cirrhinus reba, Chela facisata, C. laubuca, Essomus danricus, Perlucisoma daniconius, Puntius sophare, P. ticto, Siluridae (Ompak bimaculatus), Channidae (Channa striatus), Aplocheilidae (Aplochelus linnaetus) and Asphronemidae (Osphronemus goramy). The macrophytes and freshwater prawn (Macrobrachium sp.) were also present. During May- June, when water level decreases, the biological diversity was prone to predation by birds and pouching by human beings.
Publication Year: 2008
Publication Date: 2008-01-01
Language: en
Type: article
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