IJEP 44(12): 1081-1088 : Vol. 44 Issue. 12 (December 2024)
1. Indian Institute of Science (IISc), Energy and Wetlands Research Group (CES TE15), Centre for Ecological Sciences, Bangalore – 560 012, Karnataka, India
2. Indian Institute of Science (IISc), Centre for Sustainable Technologies (ASTRA), Bangalore – 560 012, Karnataka, India
3. Indian Institute of Science (IISc), Centre for Infrastructure, Sustainable Transportation and Urban Planning (CiSTUP), Bangalore – 560 012, Karnataka, India
4. Indian Institute of Information Technology and Management-Kerala, C. V. Raman Laboratory of Ecological Informatics, Thiruvananthapuram – 695 581, Kerala, India
Abstract
Freshwater ecosystems are one of the world’s richest sources of biological diversity. Environmental quality and biodiversity in freshwater ecosystems are interrelated, as the interaction helps to perform diverse functions, which are valuable and essential for the sustainability of biotic communities. However, freshwater ecosystems in urban landscapes are undergoing stress due to overexploitation of biotic species, introduction of exotic species, sustained inflow of point sources of pollution and alterations in the ecological niche. Conservation of fragile ecosystems in urban landscapes to sustain native biodiversity requires comprehensive studies through regular monitoring to understand variations in abiotic (physico-chemical) characteristics with composition of biotic elements at trophic levels. The current study investigates the trophic composition and water quality status in freshwater lakes in Bangalore. The study reveals that the diversity of fish, zooplankton and microalgae varied with the physicochemical characteristics of lakes. The water quality results showed that Hebbal lake was more polluted than Nagavara lake. Multivariate analyses reveal that the density of primary consumers, ionic parameters and dissolved oxygen are the main factors influencing the fish population. These findings provide insights for adopting sustainable management approaches through a deeper comprehension of the dynamics of a lake ecosystem, which strengthens the conservation of fragile ecosystems.
Keywords
Diversity index, Fish, Lake, primary producers, Primary consumers
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