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Study Warns Nilgiri Wood Pigeon Habitat in Western Ghats to Shrink Drastically by 2100 due to Climate Change — UPSC Current Affairs | March 3, 2026
Study Warns Nilgiri Wood Pigeon Habitat in Western Ghats to Shrink Drastically by 2100 due to Climate Change
A recent study using MaxEnt modelling predicts that the Nilgiri Wood Pigeon, an endemic bird of the Western Ghats, will lose most of its high‑suitability habitat by 2100 due to climate change, despite its current IUCN status of Least Concern. The authors call for climate‑resilient conservation measures, systematic field surveys, and periodic reassessment of its threat status.
Climate‑induced Habitat Contraction of the Nilgiri Wood Pigeon The recent paper “Biogeography and habitat suitability of the Nilgiri Wood Pigeon using MaxEnt” (Proceedings of the Indian National Science Academy) warns that the endemic Nilgiri Wood Pigeon could be confined to a few isolated pockets by the end of the century because of climate change . Key Developments Using MaxEnt , researchers forecast an initial rise in suitable area (2021‑2040) followed by a sharp decline (2081‑2100). Habitat suitability is projected to contract as montane forests become hotter and less suitable for cold‑adapted species. Despite a recent IUCN down‑listing to Least Concern , the authors argue that the status is not backed by systematic ground surveys. Important Facts The pigeon inhabits high‑elevation wet evergreen and moist deciduous forests of the Western Ghats , especially the Nilgiris and Anamalai Hills. Isolated populations exist in Biligirirangan, Nandi Hills and northern Maharashtra. These “ sky islands ” host many specialised species. Researchers extracted 9,757 occurrence records from eBird , distilled to 117 reliable presence points, and modelled them against nine bioclimatic variables. UPSC Relevance Understanding species‑distribution modelling, the impact of climate change on biodiversity, and the role of institutions like BNHS are crucial for GS‑4 (Environment) and for interdisciplinary questions linking ecology, policy and sustainable development. Way Forward Implement climate‑resilient conservation strategies for high‑altitude forests, including habitat corridors to connect fragmented sky islands . Conduct systematic ground surveys to validate population estimates, breeding ecology and habitat use. Integrate the species’ projected habitat loss into periodic IUCN reassessments and national Red‑List updates. Promote community‑based monitoring using platforms like eBird to generate real‑time data. Proactive planning that anticipates ecological shifts, rather than reacting post‑collapse, is essential to safeguard the Nilgiri Wood Pigeon and the broader endemic fauna of the Western Ghats.
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Overview

Climate change threatens Nilgiri Wood Pigeon, risking loss of Western Ghats biodiversity

Key Facts

  1. Nilgiri Wood Pigeon (Columba elphinstonii) is endemic to high‑elevation forests of the Western Ghats.
  2. MaxEnt modelling using 117 reliable occurrence points predicts a rise in suitable area (2021‑2040) followed by a sharp decline (2081‑2100).
  3. By 2100, suitable habitat may shrink to isolated "sky islands", confining the species to less than 5% of its current range.
  4. The species was down‑listed to Least Concern by IUCN in 2022, but experts warn reassessment is needed due to projected habitat loss.
  5. Researchers extracted 9,757 eBird records, distilled to 117 points, and modelled them against nine bioclimatic variables.
  6. Nine bioclimatic variables (temperature, precipitation, etc.) were used to forecast future distribution.
  7. Conservation recommendations include habitat corridors, systematic ground surveys, and community‑based monitoring via eBird.

Background & Context

The study highlights how climate‑induced shifts in temperature and precipitation jeopardise endemic fauna in the Western Ghats, a UNESCO World Heritage biodiversity hotspot. It underscores the relevance of species‑distribution modelling for climate‑adaptation policy and the need for proactive conservation measures under the GS‑3 (Environment and Biodiversity) syllabus.

UPSC Syllabus Connections

Essay•Environment and SustainabilityGS3•Biodiversity and its ConservationPrelims_GS•Ecology and BiodiversityGS3•Conservation, environmental pollution and degradationPrelims_GS•Physical Geography of IndiaEssay•Economy, Development and InequalityPrelims_GS•Environmental Issues and Climate Change

Mains Answer Angle

In GS‑3, candidates can address the impact of climate change on endemic species and propose climate‑resilient conservation strategies, linking ecological modelling with policy interventions.

Full Article

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Analysis

Practice Questions

Prelims
Easy
Prelims MCQ

Species distribution modelling

2 marks
4 keywords
GS3
Medium
Mains Short Answer

Conservation status assessment

10 marks
6 keywords
GS3
Hard
Mains Essay

Biodiversity conservation and climate adaptation

250 marks
8 keywords
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