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<p>Aquatic insects play a crucial role in freshwater ecosystems as bioindicators of water quality and environmental health. The present study aimed to assess the diversity and distribution of aquatic insects in Sagar Lake, India, in relation to physicochemical parameters across different seasons. A total of 5,352 aquatic insects were collected from eight different sites, representing 29 taxa. Hemiptera emerged as the most abundant order, with <i>Diplonychus rusticus</i> being the dominant species across all seasons. The highest species richness was recorded during the rainy season, which can be attributed to increased habitat heterogeneity and improved colonization conditions. In contrast, the winter season exhibited the highest abundance of individuals. Statistical analyses revealed significant correlations between aquatic insect diversity and water quality parameters, such as depth, dissolved oxygen, chloride, and total alkalinity. The Biological Monitoring Working Party (BMWP), Stream Invertebrate Grade Number-Average Level (SIGNAL 2), and Average Score Per Taxon (ASPT) indices were employed to evaluate water quality. The BMWP scores indicated moderate to good water quality, with seasonal variations, while SIGNAL 2 scores consistently suggested severe pollution across all sites. ASPT values indicated moderate pollution, reinforcing the need for effective water quality management strategies. The absence of pollution-sensitive taxa such as Ephemeroptera, Plecoptera, and Tricoptera further highlights the lake's pollution stress. This study underscores the importance of biomonitoring in freshwater ecosystems and calls for conservation measures to mitigate pollution and enhance aquatic biodiversity.</p>

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Study of aquatic insect diversity and evaluation of the ecological status of the Sagar Lake

  • 期刊论文

  • 发表日期：

    2025年3月14日

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  • Chameli Bandhaw,
  • Aditya Moktan Tamang,
  • Versha Sharma

摘要

Aquatic insects play a crucial role in freshwater ecosystems as bioindicators of water quality and environmental health. The present study aimed to assess the diversity and distribution of aquatic insects in Sagar Lake, India, in relation to physicochemical parameters across different seasons. A total of 5,352 aquatic insects were collected from eight different sites, representing 29 taxa. Hemiptera emerged as the most abundant order, with Diplonychus rusticus being the dominant species across all seasons. The highest species richness was recorded during the rainy season, which can be attributed to increased habitat heterogeneity and improved colonization conditions. In contrast, the winter season exhibited the highest abundance of individuals. Statistical analyses revealed significant correlations between aquatic insect diversity and water quality parameters, such as depth, dissolved oxygen, chloride, and total alkalinity. The Biological Monitoring Working Party (BMWP), Stream Invertebrate Grade Number-Average Level (SIGNAL 2), and Average Score Per Taxon (ASPT) indices were employed to evaluate water quality. The BMWP scores indicated moderate to good water quality, with seasonal variations, while SIGNAL 2 scores consistently suggested severe pollution across all sites. ASPT values indicated moderate pollution, reinforcing the need for effective water quality management strategies. The absence of pollution-sensitive taxa such as Ephemeroptera, Plecoptera, and Tricoptera further highlights the lake's pollution stress. This study underscores the importance of biomonitoring in freshwater ecosystems and calls for conservation measures to mitigate pollution and enhance aquatic biodiversity.