Dragonfly Surge Signals Wetland Health in Delhi Parks

Recent surveys across seven Delhi Development Authority (DDA) biodiversity parks reveal rise in dragonfly and damselfly populations. Between September 25 and 27, 2025, a 54% increase was recorded compared to the previous year. The total count rose from 8,630 to 13,253 individuals. This surge marks improving wetland ecosystems and biodiversity resilience in urban Delhi.

Survey Overview and Key Findings

The survey covered seven major biodiversity parks in Delhi. Kamla Nehru Ridge led with 3,935 individuals and 26 species. Kalindi followed with 3,682 individuals and 20 species. Aravalli recorded 2,249 individuals across 16 species. Other parks included Yamuna Biodiversity Park (1,730 individuals, 21 species), Tughlaqabad (1,061 individuals, 14 species), Neela Hauz (523 individuals, 15 species), and Tilpath Valley (73 individuals, 6 species). Notably, the Yellow-tailed Ashy Skimmer (Potamarcha congener) was documented for the first time at Yamuna Biodiversity Park.

Species Diversity and Population Trends

Species diversity increased notably in Aravalli (from 10 to 16 species), Kalindi (14 to 20), and Neela Hauz (5 to 15). Kamla Nehru Ridge and Tughlaqabad showed slight increases. Tilpath Valley saw a minor decline. The Wandering Glider was the most frequently sighted species across several parks. Ditch Jewel dominated at Tughlaqabad and Neela Hauz. These trends indicate habitat improvement and successful breeding cycles post-monsoon.

Ecological Significance of Dragonflies and Damselflies

Dragonflies and damselflies, collectively known as odonates, are vital bioindicators for wetland health. Their larval stages require clean, oxygen-rich water, making their presence a marker of good water quality. Both larvae and adults consume large numbers of mosquitoes, helping control vector populations and reduce disease transmission risks. A single dragonfly can eat 30-100 mosquitoes daily, which is crucial in flood-prone urban areas.

Impact of Monsoon and Urban Wetland Management

The 2025 monsoon created many temporary water bodies, facilitating odonate breeding. This contrasts with the erratic rains two years prior, which hindered breeding and population growth. Improved rainfall patterns combined with dedicated biodiversity park management have enhanced ecosystem resilience. The annual post-monsoon survey, conducted with University of Delhi students, aids in monitoring wetland recovery and guides conservation efforts.

Role of Biodiversity Parks in Urban Ecology

Delhi’s biodiversity parks serve as crucial refuges for wildlife within the city. They support diverse species and maintain ecological balance. The parks’ management by DDA incorporates scientific monitoring and community participation. This approach helps track environmental changes and promotes sustainable urban development. Increased odonate populations reflect the success of these initiatives in restoring natural habitats.