Biomonitoring of zooplankton to assess the quality of water in the nagpokhari of Kathmandu valley
Sunil Ram Vaidya
Zooplanktons are heterogeneous assemblage of minute floating animal forms found in water. They may bear some locomotory structures but are not capable of propelling against the water currents. They usually act as primary consumers and constitute an important link between primary producers (phytoplankton) and higher consumers like carnivore fish in aquatic food chain. The zooplankton mainly consume primary producer and form the major food source for tertiary consumers. Certain species of zooplanktons are used as bio indicators of water quality. The estimation of plankton analysis helps in explaining the cause of color, turbidity, presence of odor, taste and visible particles in water. Thus, the present study deals with the role of biological parameter especially zooplankton community and its trophic status to assess water quality of four selected area in the Nagpokhari of Kathmandu Valley. Pollution status of pond was assessed on the basis of the Palmer’s Pollution Index, Shannon Wiener Index and physico-chemical parameters. A total of 10 genera belonging to 3 groups of zooplankton were identified from the pond. Different patterns of dominance and sub-dominance of species along with physico-chemical quality observed confirms the pollution status of the pond.