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The physico-chemical characteristics of water, aquatic weeds and bank flora of three water reservoirs located in Krishnagar city (longitude 88°33'E, latitude 23°24'N), West Bengal, India, were studied for a period of 24 months. Altogether 13 genera of aquatic macrophytes belonging to 10 families, and 24 plant species (bank flora) belonging to 16 families were identified in the present investigation. The physico-chemical characteristic of pond water was found to be altered due to these aquatic plants. We have found a general relationship between trophic status of a water body and the aquatic plants present there. We have also found the alteration of water quality due to presence of various aquatic plants. Key words: Physico-chemical characteristics, hydrophytes, macrophytes, bank flora, weeds. DOI: 10.3126/eco.v16i0.3467 ECOPRINT 16: 9-13, 2009

Study of Hydrophytes in Some Lentic Water Bodies in West Bengal, India