Year: 2025 | Month: June | Volume 18 | Issue 2
Zooplankton Diversity with Special Reference to Water Quality of Yamuna River at Delhi
Anand Kumar Dubey
I.R. Pathak
DOI:10.30954/0974-1712.01.2025.5
Abstract:
Present investigation was conducted to study the relationship between physico-chemical characteristics and seasonal variation on the diversity of zooplanktons of river Yamuna in the stretch of Delhi. For this purpose samples were collected for one year during Feb 2024 to March 2025 from three different Locations i.e. SW1-Near Wazirabad bridge (Upstream and entry point of Yamuna river in Delhi), SW2-Near ITO (Mid-stream and located in middle of stretch of Yamuna river in Delhi) and SW3-Near Okhla barrage From Kalindi Kunj (Downstream and exit point of Yamuna river from Delhi). These samples were tested for various physicochemical parameters like Temperature, pH, Turbidity, Electrical conductivity, Total dissolved solid, Total Suspended solid, Total hardness, Total alkalinity, Dissolved oxygen, Biological oxygen Demand, Free CO2, Nitrate, Phosphate and Chloride etc. Zooplankton analysis was also carried out during whole sampling period. The Values of the physicochemical parameters varied at all the three
locations because of discharge of the huge quantity of sewage and industrial effluent in this stretch of river. Four groups of zooplanktons were reported i.e. Rotifers, Cladocera, Copepods and Ostracodes. The density of zooplankton was found to be very low at all the three locations. The lowest density is recorded at location SW2 because it is situated in centre of the city and receive very large amount of sewage and untreated effluent from the whole city. Among all the group of the zooplankton Rotifers were found to be most dominant at all location followed by Cladocera, Copepoda and Ostracoda. The overall population of were recorded maximum during pre-monsoon season.
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Highlights
- Zooplankton diversity in the Yamuna River was studied over one year across three locations in Delhi, revealing low overall density due to pollution.
- Rotifers emerged as the most dominant group, especially during the pre-monsoon season when populations peaked.
- Midstream site SW2 showed the lowest zooplankton density, heavily impacted by sewage and industrial effluent discharge.
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