当前世界环境

Water is the most precious resource on earth. It plays a predominant role in distribution of organisms. Fresh water contains various micro-organisms6. The quality of water1,5 through parameters (Physico-Chemical) affects the species composition, their abundance and productivity of water. Some organisms can survive in a wide range of conditions and some are more tolerant to pollution while others are very sensitive to changes in conditions and intolerant to pollution. These fresh water bodies namely Ravishankar, Murrum-silly and Sondhur reservoir, which serve as drinking, irrigation and major Sources of fish culture were studied with relation in between physico-chemical condition and diatoms flora. Samples were collected on the monthly basis from three selected sites of water bodies for a period of one year. Author carried out the 28 species of diatoms have been recorded minimum species were recorded in Sondhur reservoir and maximum species are recorded in Ravishankar reservoir. The number of species diatoms were directly affected to physico-chemical condition of concern water bodies. In this study, reported, diatoms species grow better during January to April and November to December and pH range of 7.8 to 8.6. Similarly high nitrate and phosphate content and dissolved oxygen favour more growth of all the species. The role of physico-chemical parameters in productivity of diatoms has been discussed in this research.