Seasonal and Interannual Variations of Blue-Green Algal Taxa in the Chours of Supaul District, Bihar, India Driven by Distinct Nutrient Regimes

Supaul district of North Bihar is characterized by a diverse array of wetland ecosystems, including chaurs, swamps, dhars, mans, ditches, lakes, ponds and pools. These aquatic habitats have developed as a result of the region’s extended rainy season and frequent flooding events. The abundance of water bodies in this area creates an ideal environment for the thriving of aquatic plant life, supporting over 120 species of algae and blue-green algae. Blue-green algae, also known as cyanobacteria, are photosynthetic microorganisms that play a crucial role in aquatic ecosystems. However, excessive growth of these organisms can lead to harmful algal blooms, posing significant threats to water quality and ecosystem health. This study was conducted using weekly interval samplings from 2018 to 2023 and it investigates the seasonal and interannual variations of blue-green algal taxa in the chours (wetlands) of Supaul district, Bihar, India, with a focus on the influence of nutrient regimes. The research contributes to our understanding of the region’s algal biodiversity, particularly the Cyanophyceae class. Present study investigated the response of blue-green algae (BGA) growth to environmental variations in various chours of Supaul district, focusing on the effects of nutrients, N:P ratios, and flow regime influenced by monsoon intensity.