BIODIVERSITY OF FRESHWATER ZOOPLANKTON IN RELATION TO HEAVY METAL POLLUTIONMADHU SUDAN SHARMA, F. L/YAQUAT, D. BARB AR AND N. CHISHTYAbstract Water quality and biodiversity studies of inland waters are needed in relation to heavy metal contamination for a proper understanding of structural and functional responses of fresh water ecosystems to these persistent pollutants. Heavy metal content in water as well as in sediments was measured by atomic absorption spectrophotometer. High adsorption and concentration of zinc and cadmium is noted in the sec!iments of polluted water bodies of Berach river system. Bichhdi El pond contained the highest amount of zinc and cadmium in water and sediment as it receives effluent stream of Zinc Smelter, Debari. °onlarative I ininological studies have been attempted to observe water quality and diversity of zooptalikton in all water bodies belonging to Berach river system. During present study, five distinct iiinnological zones have been recognized. An uncontaminated low trophic level reservoir, Madar exhibited rich diversity of zooplankon. Biodiversity had declining and again increasing trend depending upon heavy niciai load in different water bodies belonging to Berach river system. Bichhdi-II Gadwa ponds were found to be biological desert except marginal grasses and insects. Remarkable reduction in size of Brad:kJnus calciflorns have been observed in down stream ponds.
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