A Study on the Diversity of Planktons of Urban and Rural Ponds of Kokrajhar District, Assam, India

Due to rapid urbanization, many aquatic habitats are now under severe eutrophication because of waste contaminated soil. Therefore, it is essential to assess the status of aquatic ecosystem surrounding us. The present study was conducted for the study of diversity of planktons which are indicator of aquatic ecosystem of two urban and two rural ponds of Kokrajhar district, Assam. The present study reveals a total of 37 species of planktons of which 23 species represents phytoplankton and 14 species represent zooplankton. The most pollution-tolerant species of Euglena, Navicula, Nitzschia, Ankistrodesmus, Phacus,Pinnularia and Scenedesmus were recorded indicating the highest degree of organic pollution. This plankton study explore that water quality has reached its threshold level and therefore, it needs some corrective measures to maintain the water quality from further deterioration in the study area.