IJEP 42(12): 1456-1463 : Vol. 42 Issue. 12 (December 2022)
Sejuti Roy and Santosh Kumar Sarkar*
Dinabandhu Mahavidyalaya, Department of Zoology, Bongaon – 743 235, West Bengal, India
To determine the anthropogenic effect on the water quality and plankton biodiversity, a study was conducted at four sites along Ganges (Hooghly) river estuary and another four sites at Gangasagar, extreme southern part of Sagar island, western part of Indian Sundarban. Two different events, namely idol immersion after Durga puja and Gangasagar mela (GSM), which hugely responsible for the deterioration of the total aquatic heath, was chosen for this study. The hydrological parameters showed considerable heterogeneity for both the events – idol immersion and Gangasagar mela. Dissolved oxygen (DO), also correlated with pH, showed the maximum (5.81) and minimum (4.09) value during GSM and immersion, respectively. The turbidity value was found to be maximum at Babughat (19.5) during the immersion of idol. On average, maximum chlorophyll a concentration was recorded during post event periods, coinciding with maximum abundance and diversity of phytoplankton. The pattern of tintinnid ciliate (dominant microzooplankton) distribution exhibited relatively lower values during the events and an increasing trend towards the end of the events. Maximum (557 in/dL) and minimum numerical abundance (51 in/dL) of tintinnids were noticed during post and during the event, respectively. Our data support a positive relationship with the spatial and temporal fluctuations of phytoplankton with tintinnids.
Anthropogenic effect, plankton, tintinnid, water quality, biodiversity
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