Asian Journal of Microbiology, Biotechnology & Environmental Sciences Paper

Vol 6 Issue 3, 2004; Page No.(367-371 )

ECOLOGICAL ASPECTS OF HIGHLY POLLUTED AND EUTROPHICATED HUSAINSAG AR LAKE SEDIMENTS AND ITS IMPACT ON MINERALIZATION OF ORGANIC MATTER

S. RADHA AND G. SEENAYYA

Abstract

Fresh water lake sediments play a critical role in the biodegradation of organic matter and mineral cycling. The activity of different physiological groups of bacteria, both aerobic and anaerobic depend on the environmental factors and physiographic features of the lake. In the present study an attempt was made to understand the dynamic state of the lake by analyzing the population densities of amylolytic, proteolytic, lipolytic and sulfate reducing bacteria and associated physicochemical factors and certain heavy metal concentrations in sediments at two sites of Husainsagar lake. The sediments are sandy silt in nature, alkaline, anaerobic and with high concentrations of nitrogen, phosphorous and organic matter. High concentration of Cd, Cu, Zn and Mn were observed with the lake sediments. Increased productivity was observed with site- II sediments. The sediment population was ten fold more than that.of overlying water column. The greater abundance of proteolytic, lipolytic and sulfate reducing bacteria at Site-II due to the increased availability of respective substrates. The increased productivity at Site-II, indicates the settlement of nitrogen rich algal autochthonous biomass to the sediments.

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