06 Oca 2025 Pazartesi
Diversity and distribution of Odonates in a coastal ecosystem of Namkhana, West Bengal, India
Abstract : Dragonflies are aquatic insects that are intimately tied to the presence of freshwater ecosystems. The decline of dragonfly populations in rural areas can be attributed to various factors, including habitat destruction, water pollution, and altered ecosystem dynamics. This comprehensive study investigated the diversity and distribution of Odonates (dragonflies and damselflies) in a coastal ecosystem of Namkhana, West Bengal, India. A total of 39 species were recorded, comprising 26 dragonflies and 13 damselflies, across four sites with distinct biodiversity profiles. Statistical analysis revealed significant variations in species composition, abundance, and distribution patterns across the grids, with Grid 4 emerging as the most diverse. Seasonal monitoring showed changes in species distribution and abundance, with some species exhibiting significant increases or decreases during different seasons. Behavioral aspects, including feeding other odonates, egg-laying, mating, territorial defense, and communal roosting, were also explored. Advanced statistical analyses, including species packing curve, abundance, and paired group UPGMA hierarchical cluster analysis were employed to elucidate the ecological patterns. Alpha diversity analysis and individual rarefaction analysis provided further insights into species diversity. The findings highlight the importance of conservation efforts to protect these vulnerable species and their habitats, and provide valuable insights into the ecological significance of Odonates in coastal ecosystems.