Composition and Diversity of Aquatic Insects of Majuli River Island of Assam
Shimantini Borkataki*
Dept. of Entomology, Assam Agricultural University, Jorhat, Assam (785 013), India
Badal Bhattacharyya
Dept. of Entomology, Assam Agricultural University, Jorhat, Assam (785 013), India
Ritu Ranjan Taye
AAU, Zonal Research Station, Karimganj, Assam (788 710), India
DOI: https://doi.org/10.54083/ResBio/6.2.2024/52-62
Keywords: Aquatic, Composition, Diversity, Majuli
Abstract
The composition and diversity of aquatic insect was studied at Majuli river island during 2016-18. The occurrence of 48 species under 6 orders and 20 families was observed during surveys conducted in pre monsoon, monsoon, post-monsoon and winter seasons covering 3 locations, 15 villages and 60 sampling sites. Odonata (47.92%) was the most dominant order with 23 species followed by 9 species of Coleoptera and Hemiptera with 18.75% abundance and Ephemeroptera (3 species, 6.25% abundance). While studying the diversity indices, the highest aquatic insect species were registered in Lower Majuli (29 species) followed by Upper Majuli (24 species) and Central Majuli (17 species). Highest Shannon-Weiner Index (H'=3.156), Simpson Index of Diversity (1-D=0.983) and Evenness (EH=0.983) were recorded during monsoon season in Upper Majuli, whereas the lowest Shannon-Weiner Index (H'=2.341), Simpson Index of Diversity (1-D=0.913) and Evenness (EH=0.860) were registered during winter in Central Majuli.
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