INFLUENCE OF PHYSICOCHEMICAL PARAMETERS ON THE DISTRIBUTION OF HETEROTROPHIC BACTERIA IN A HIGHLY POLLUTED AND EUTROPHICATED FRESHWATER LAKES. RADHA AND G. SEENAYYAAbstract The heterotrophic bacterial activity reflects the hydrologic structure and nutrient levels in the freshwater lake. In the present study, water samples from different depths of two different sites of Husainsagar lake, a highly polluted and eutrophicated lake were analysed for total heterotrophic bacteria and related physicochemical parameters. The heterotrophic bacterial population varied 0.04x106 to 40.0x106 with an average value of 5.57 x 106 CFU/ml in the water profile of the lake. Highest bacterial density was found at the deeper site, site-II of the lake, which was associated with high concentrations of oxidizable organic matter, orthophosphate and ammonia and low values of dissolved oxygen. Vertically, heterotrophic bacterial count was recorded maximum in bottom strata of both the sites along with increase in suspended solids, depth, hydrogen sulfide and decrease in dissolved oxygen and pH. Seasonally maximum bacterial population was observed in monsoon and showed good correlation with suspended solids.
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