22 July 2026

Conservation threats to the rare white-bellied heron in Northeast India

This topic directly addresses critical GS3 conservation issues, including species protection under the Wildlife Protection Act, habitat degradation from hydroelectric projects, and specific shortcomings in Environmental Impact Assessment (EIA) processes.

• White-bellied heron (Ardea insignis) status: Rare, elusive bird reaching up to four feet in height, inhabiting Himalayan river systems up to 1,500 metres above sea level.
• Legal protection: Listed under Schedule I of the Wildlife Protection Act, 1972, granting it the highest level of legal protection in India.
• Population and distribution: India's estimated population is only 6 to 9 individuals distributed across three rivers in Arunachal Pradesh (Noa-Dehing, Lahm, and Lohit). Globally restricted to small pockets in Arunachal Pradesh, Bhutan, and Myanmar.
• Habitat requirements: Depends heavily on mature riparian forests for roosting and nesting on tall trees, and shallow, clear fast-flowing river waters for specialized fish foraging.
• Lohit River significance: The Lohit River basin harbours approximately 70% of India's white-bellied heron population, with the Lahm River being a key tributary.
• Major threats: A proposed 1,200-MW hydroelectric power project on the Lohit River involves clearing over 33,000 trees and submerging mature riparian forest, altering water flow and turbidity.
• EIA shortcomings: Environmental Impact Assessment (EIA) conducted by WAPCOS Ltd omitted the White-bellied heron, citing its absence in the immediate diversion area rather than taking a river-basin approach.
• Compensatory afforestation concerns: Proposed compensatory afforestation in 51 patches in Madhya Pradesh, over 1,000 km away, cannot replicate the complex climatic, edaphic, and biotic interactions of Eastern Himalayan riparian ecosystems.
• Additional anthropogenic stressors: Removal of large river boulders, river course alterations, unregulated tourism, sand extraction, pollution, and fish poisoning.

1. Site-isolated Environmental Impact Assessments (EIAs) often fail to safeguard specialized and threatened fauna in ecologically sensitive landscapes. Discuss the need for adopting a landscape and basin-level EIA framework for linear and hydro-power developments in the Eastern Himalayas. 250 words
2. Critically examine the ecological efficacy of compensating the loss of old-growth riparian forests through compensatory afforestation carried out in distant geographic locations. 150 words

1. With reference to the White-bellied heron (Ardea insignis), consider the following statements: 1. It is protected under Schedule I of the Wildlife Protection Act, 1972. 2. In India, its current distribution is primarily limited to river basins in Arunachal Pradesh. 3. It nests mainly in low-lying mangrove wetlands along the eastern coast. Which of the statements given above is/are correct?
   1. 1 and 2 only
   2. 2 only
   3. 1 and 3 only
   4. 1, 2 and 3
   Answer A
2. Which of the following best explains why compensatory afforestation in distant regions fails to mitigate the impact of riparian forest loss in the Eastern Himalayas?
   1. Riparian tree species cannot survive outside high-altitude tropical zones.
   2. Natural forest ecosystems possess complex climatic, edaphic, and biotic interactions developed over long periods that cannot be recreated artificially.
   3. Compensatory afforestation outside the host state is prohibited by the Forest Conservation Act.
   4. Distant afforestation leads to net forest loss due to differing soil acidity levels.
   Answer B

• Conservation, environmental pollution, degradation GS3

• Biodiversity Conservation
• Forestry & Wildlife

• India’s rarest heron faces a silent end as new dam ignores its home