WATER QUALITY ASSESSMENT IN THE MANGROVE ECOSYSTEM OF INDIAN SUNDARBANSDEBABRATA MUKHERJEE, MADHUMITA DAS AND G.K. SENAbstract The physico-chemical parameters of estuarine water of Indian Sundarbans mangrove ecosystem has been studied from 2004 to 2008 during different seasons i.e. Pre-monsoon, Monsoon and Postmonsoon. Seasonal changes of important hydrological parameters like DO, BOD, Salinity, pH, Turbidity and Nitrate with a distinct fluctuation have been found at some important sites of Sundarbans. The value of BOD in pre-monsoon increased sharply in the studied sites in 2008 in comparison with its previous years. Accordingly the value of salinity at the studied spots in the pre-monsoon of 2008 was very high in comparison with the value of 2004. Even the value of turbidity was also high in pre-monsoon of 2008 than the previous years. The monsoon and post-monsoon of 2008 have also high value of salinity, BOD and turbidity in almost all the studied places. The pre-monsoon and monsoon seasons are harshly affected by the increasing trend of ambient water quality of the mangrove ecosystem.
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