Water Quality Monitoring for the Sustainable Management of Aquatic Ecosystem in the Markandeya Dam Reservoir, Kolar District, Karnataka, India
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Water is an irreplaceable natural resource and the cornerstone of aquatic and terrestrial ecosystems alike. Dams and reservoirs are critical infrastructure that support biodiversity, agriculture, potable water supply, hydropower generation, flood mitigation, and recreation. Despite their ecological importance, reservoir water quality remains vulnerable to seasonal fluctuations, anthropogenic pollution, and nutrient enrichment. The present study evaluates the physico-chemical characteristics and plankton community structure of Markandeya Dam, Kolar District, Karnataka, India, across pre-monsoon, monsoon, and post-monsoon seasons from February to July 2025. Phytoplankton (22 taxa) and zooplankton (14 taxa) were enumerated and subjected to nine diversity indices. A Water Quality Index (WQI) computed via the Weighted Arithmetic Index method yielded a value of 46.57, classifying the reservoir as moderately polluted. Nygaard's Water Quality Indices (NWQI) further indicated a mesotrophic trophic status. Most physico-chemical parameters conformed to WHO and BIS drinking-water standards; however, dissolved oxygen variability and elevated faecal coliform counts signal localized organic pollution and microbial contamination risks. Shannon–Wiener diversity indices for both phytoplankton (H' = 0–1.45) and zooplankton (H' = 0–0.92) indicated moderate pollution, with dominance by Chlorophyceae and Monogononta rotifers, respectively. Seasonal patterns revealed higher diversity and species richness during cooler pre-monsoon months and greater dominance during warm transitional periods. The integration of WQI, NWQI, and multi-index plankton assessment constitutes a robust and replicable framework for the ecological monitoring and sustainable management of tropical reservoir ecosystems.
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References
APHA (2005). Standard Methods for the Examination of Water and Wastewater (21st ed.). American Public Health Association, Washington, DC.
Asulabha, K. S., Jaishanker, R., Sincy, V., & Ramachandra, T. V. (2022). Diversity of phytoplankton in lakes of Bangalore, Karnataka, India. In Biodiversity Challenges: A Way Forward (pp. 147–178). Springer, New Delhi.
Balseiro, E., Modenutti, B., Gutierrez, M. A., Sagarario, M. A. G., & Laspoumaderes, C. (2023). Status of zooplankton ecology in freshwater ecosystems from Argentina. Limnologica, 100, 126011. https://doi.org/10.1016/j.limno.2022.126011
Basavaraj, S. K., & Kadadevaru, G. G. (2024). Assessment of physicochemical parameters and zooplankton community at Gopalaswamy tank, Chitradurga, Karnataka. Indian Journal of Science and Technology, 17(4), 368–372.
Beyene, G., Kifle, D., & Fetahi, T. (2022). Spatial distribution of zooplankton in relation to selected physico-chemical parameters of Lake Hawassa, Ethiopia. African Journal of Aquatic Science, 47(2), 163–172. https://doi.org/10.2989/16085914.2021.2003746
Brown RM, McClelland NI, Deininger RA, Tozer RG (1970) A water quality index: do we dare? Water & Sewage Works,117(10):339-343.
Bureau of Indian Standards (BIS 2003)
Chen, X., Zhang, Y., & Li, Q. (2021). Lakes as indicators of environmental change: Impacts of pollution, land-use change, and climate variability. Global Environmental Change, 70, 102345. https://doi.org/10.1016/j.gloenvcha.2021.102345
Enawgaw, Y., Wagaw, S., Wosnie, A., & Fetahi, T. (2023). Zooplankton as ecosystem indicators and their effects on eutrophication in Lake Arekit, Ethiopia. Journal of Freshwater Ecology, 38(1), 2287433. https://doi.org/10.1080/02705060.2023.2287433
Falkowski, P. G., & Raven, J. A. (2007). Aquatic Photosynthesis (2nd ed.). Princeton University Press, Princeton, NJ.
Farnaz, S., & Rahmatullah, M. (2021). Study of water quality using physico-chemical parameters of two perennial ponds of Darbhanga District, Bihar. International Journal of Fisheries and Aquatic Studies, 9(5), 95–98.
Garg, A. (2022). Physico-chemical parameters and planktons of water samples from Taraori pond and Karna Lake, Karnal, Haryana. International Journal of Research in Engineering Sciences, 10(9), 456–464.
Ginatullina, E. N., Kurbanov, A. R., & Tuychiev, K. S. (2023). Influence of environmental factors on zooplankton communities in a large lake system in Uzbekistan. E3S Web of Conferences, 407, 01004. https://doi.org/10.1051/e3sconf/202340701004
Hammer, Ø., Harper, D. A., & Ryan, P. D. (2001). PAST: Paleontological statistics software package for education and data analysis. Palaeontologia Electronica, 4(1), 1–9.
Horton, R. K. (1965). An index-number system for rating water quality. Journal of the Water Pollution Control Federation, 37(3), 300–305.
Hutchinson, G. E. (1967). A Treatise on Limnology, Vol. 2: Introduction to Lake Biology and the Limnoplankton. John Wiley & Sons, New York.
Imoobe, T. O. T., & Akoma, A. O. (2008). Assessment of zooplankton community structure of the Bahir Dar gulf of Lake Tana, Ethiopia. Ethiopian Journal of Environmental Studies and Management, 1(2), 26–34. https://doi.org/10.4314/ejesm.v1i2.41577
Johnson, K. E., & Wang, H. (2020). Ecological dynamics of lakes: Nutrient loading, sedimentation, and climatic influences. Limnology and Oceanography, 65(7), 1502–1517. https://doi.org/10.1002/lno.11432
Kour, S., Slathia, D., Sharma, N., Kour, S., & Verma, R. (2022). Zooplankton as bio-indicators of trophic status of a lentic water source, Jammu. Proceedings of the National Academy of Sciences, India Section B: Biological Sciences, 92, 393–404. https://doi.org/10.1007/s40011-022-01349-z
Manjare, S. A., Vhanalakar, S. A., & Muley, D. V. (2010). Analysis of water quality using physico-chemical parameters of Tamdalge tank in Kolhapur District, Maharashtra. International Journal of Advanced Biotechnology Research, 1(2), 115–119.
Miller, J. R., & Lake, P. S. (2014). Lakes and their role in regional hydrology and ecology. Environmental Reviews, 22(3), 245–260. https://doi.org/10.1139/er-2014-0023
Mohammed, A., Mengistou, S., & Fetahi, T. (2023). Effects of water quality parameters, water level changes, and mixing on zooplankton community dynamics in tropical Lake Ardibo, Ethiopia. Environmental Monitoring and Assessment, 195, 927. https://doi.org/10.1007/s10661-023-11500-6
Ndah, A. B., et al. (2022). Zooplankton diversity and its relationship with water quality indicators. Freshwater Biology, 67(4), 712–729.
Nygaard, G. (1949). Hydrobiological studies on some Danish ponds and lakes. Kongelige Danske Videnskabernes Selskabs Biologiske Skrifter, 7(1), 1–293.
Oh, W. S., Park, G. C., Choi, J. H., Lee, H. B., & Lee, K. (2023). Density estimation of euphausiids and copepods by multi-frequency method. Fisheries and Aquatic Sciences, 26(12), 689–697. https://doi.org/10.47853/FAS.2023.e61
Rashid, H., & Prakash, A. (2022). Zooplankton community structure as water quality indicators in freshwater bodies of Jammu, India. Journal of Limnology, 81(2), 45–58.
Smith, J. A., Brown, L. M., & Taylor, K. (2018). Freshwater biodiversity: Conservation status and threats to lakes. Aquatic Conservation: Marine and Freshwater Ecosystems, 28(5), 1112–1127.
Wilhm, J. L., & Dorris, T. C. (1968). Biological parameters for water quality criteria. BioScience, 18(6), 477–481.
World Health Organization (WHO 2005)
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