| Abstract: | The limnology of a sewage polluted pond was studied from 1978 to 1981. Stratification of temperature, dissolved, oxygen, conductivity, pH, alkalinity and chloride was recorded. The surface stratum down to 0.5 m was supersaturated throughout the year. The pond recorded a permanent water bloom dominated by Anacystis during the summer months. This was followed by Anabaena and Anabaenopsis during winter. The growth of Chlorococcales was retarded due to intraspecific competition, self-shading and low carbon dioxide levels though the waters were nutrient rich. Before the summer overturn, accumulation of calcium bicarbonate produced temporal meromixis. In general, a reduction in the number of zooplankters was recorded. |
