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Physicochemical Chracteristics and Diatom as Indicators of Trophic Status of Kishore Sagar, Rajasthan

The physicochemical characteristics and Diatom population of Kishore Sagar, Kota, Rajasthan were studied during the period from December, 2004 to December, 2005. During limnological investigations the water temperature ranged between 18 o C to 34 o C. The Hydrogen-ion concentration (pH) was found to be in the alkaline range i.e. >7.2. Electrical conductance varied between 0.22 to 0.34 mS, DO content ranged from 2.4 to 9.2 mg/l, Free CO2 varied between 2.0 to 36 mg/l whereas carbonate alkalinity was absent during the study period. Total alkalinity ranged between 80.0 to 172.0 mg/l, Total Hardness varied between 64.0 to 100.0 mg/l, Dissolved silicates varied between 2.87 to 9.8 mg/l, Sulphate ranged from 3.2 to 8.86 mg/l, Orthophosphate varied between 0.35 to 1.28 mg/l and Nitrate–nitrogen ranged between 0.0 to 0.106 mg/l. The Diatom community of Kishore Sagar comprised of forty two species representing 8 centric forms and 34 pennate types. Among Diatoms recorded from this wetland are Melosira granulata, Cocconies placentula, Diatoma elongatum, Fragilaria crotoneinsis, Ghomphonema olivaceum, Ghomphoneis herculeanum, Nitzschia sp. Navicula radios and Synedra ulna were the most dominant species. Based on the observations made during the study period it can be concluded that the water quality of Kishore Sagar is deteriorating and can be designated ‘mild eutrophic’ wetland.