Abstract :

Zooplankton are of prime importance in aquatic systems, playing vital roles as water-quality indicators and having significant influences on food web dynamics. This paper examines the abundance and diversity of zooplankton species in the Khajikotnoor reservoir, which is a vital freshwater body in Khajikotnoor village, Kalaburagi District, Karnataka. The sampling was conducted from January 2024 to December 2024 using conventional methods for the collection of plankton. Later, the zooplanktons collected were analyzed and grouped up to the species level. A total of 26 different zooplankton species were documented. They were grouped under principal groups consisting of Rotifers, Cladocera, Copepods, and Ostracoda. Among them, Rotifers turned out to be the dominant group. The results indicate that the Khajikotnoor reservoir harbours a very diverse population of zooplankton with a relatively healthy aquatic ecosystem. But human activities and eutrophication pose potential threats to the reservoir’s biodiversity. This research highlights the significance of continuous monitoring of zooplankton diversity as a bioindicator in assessing ecological well-being and formulating conservation strategies to protect the aquatic biodiversity of the reservoir.

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Keywords :

Aquatic ecosystem, Cladocera, Copepods, Khajikotnoor reservoir, Rotifers, Zooplankton diversity.

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References :

1. Battish, S. K. (1992). Freshwater Zooplankton of India. Oxford & IBH Publishing Co. Pvt. Ltd., New Delhi.
2. Kudari, V. A., & Kanamadi, R. D. (2008). Impact of changed trophic status on the zooplankton composition in six water bodies of Dharwad district, Karnataka state (South India). Environmental Monitoring and Assessment, 144(1–3), 301–313.
3. , & Vijaykumar, K. (2009). Ecology and abundance of zooplankton in Karanja Reservoir, Bidar District. Environmental Monitoring and Assessment, 152(1–4), 451–458.
4. Manickam, N., Rajan, C. K., & Ponniah, M. (2018). Seasonal variation and species composition of zooplankton in Ukkadam Lake, Tamil Nadu. International Journal of Fisheries and Aquatic Studies, 6(3), 351–357.
5. Sahu, S. K., Mandal, R. N., & Sahu, B. K. (2021). Diversity and seasonal fluctuation of zooplankton in a freshwater pond of Bankura District, West Bengal. Journal of Entomology and Zoology Studies, 9(3), 1557–1563.
6. Shivashankar, P., & Venkataramana, G. V. (2013). Ecology and diversity of zooplankton in Bhadra Reservoir, Karnataka, India. International Journal of Biodiversity and Conservation, 5(5), 319–328.
7. Patil, K. N., & Salimath, D. R. (2014). Zooplankton diversity as bioindicators in the assessment of water quality of Ghataprabha River, Karnataka. International Journal of Research in Environmental Science and Technology, 4(3), 67–74.
8. Pandit, A. K., & Yousuf, A. R. (2003). Trophic status and biodiversity of Wular Lake, Kashmir. Ecology Environment & Conservation, 9(3), 397–404.
9. Wetzel, R. G. (2001). Limnology: Lake and River Ecosystems (3rd ed.). Academic Press.
10. Steinberg, D. K., & Landry, M. R. (2015). Zooplankton and the ocean carbon cycle. Annual Review of Marine Science, 7, 47–65.
11. Murugan, N., Murugavel, P., & Kodarkar, M. S. (1998). IAAB Training Manual 2: Identification of Zooplankton. Indian Association of Aquatic Biologists, Hyderabad.
12. Kumar, A., Sharma, S., & Mishra, V. (2016). Zooplankton diversity and seasonal variation in a tropical freshwater lake of central India. Journal of Environmental Biology, 37(2), 379–384.
13. Gurumurthy, R., & Balasubramanian, S. (2010). Zooplankton diversity and seasonal variation in Poondi Reservoir, Tamil Nadu. Journal of Environmental Research and Development, 4(4), 1015–1020.
14. Nagbhushan Reddy, Siddaram L,Ramakrishna Reddy B,   “DIVERSITY AND ABUNDANCE OF ZOOPLANKTON OF GUNDALLI TANK, SHAHPUR, YADGIR DISTRICT, KARNATAKA”, International Journal of Creative Research Thoughts (IJCRT), ISSN:2320-2882, Volume.8, Issue 10, pp.1988-1992, October 2020, Available at :http://www.ijcrt.org/papers/IJCRT2010262.pdf