Unravelling the Seasonal Dynamics of Limnological Parameters and Assessment of Ecological Health: A Case Study of Lingadheeranahalli Lake in Bangalore North, Karnataka, India

ABSTRACT: The present study investigates the seasonal dynamics of limnological variables and the developmental response of D. rerio in the wetland ecosystem of Lingadheeranahalli in the northern clutches of Bangalore in Karnataka. Once a vital water source for agriculture and replenishing groundwater, the lake faces degradation due to anthropogenic activities and the need for more awareness. A yearlong analysis was conducted with five sampling seasons and three sampling stations identified within the wetland. Parameters viz. physical, chemical, and biological were analyzed following American Public Health Association (APHA) guidelines. Somite development was studied using embryos while the heart rate was counted during the torpedo stage of D. rerio. The results of this comprehensive study revealed unique and significant seasonal variations over limnological parameters, providing novel insights into the dynamics of the wetland ecosystem. pH values are slightly acidic and influenced by precipitation and terrestrial vegetation. Turbidity spiked during winter due to colloidal dispersions, while conductivity peaked in spring due to sewage disposal. Reduced dissolved oxygen, high biochemical and chemical oxygen demand indicated organic pollution and microbial activity, particularly affecting the inlet station. Elevated phosphate and nitrate levels in spring indicated eutrophication potential. The influence of rains and mineral leaching during monsoons affected parameters such as alkalinity, total dissolved solids, total hardness, and Magnesium. Analysis of D. rerio demonstrated delayed development and decreased heart rates in the inlet and deposit stations, indicative of potent stressors in the wetland ecosystem. All-inclusive Lingadheeranahalli Lake exhibited poor water quality, focusing on the need for adaptive management strategies to mitigate pollution and safeguard wetland ecosystems. Continued wetland research gives more insights into water quality and seasonal dynamics, paving the way for its conservation.