What is a Biodiversity Hotspot?

A biodiversity hotspot is a biogeographic region that harbours exceptionally high levels of species richness and endemism while simultaneously facing severe habitat loss. The concept was first introduced by British ecologist Norman Myers in 1988, when he identified 10 tropical forest hotspots. The framework was later expanded by Myers and collaborators in a landmark 2000 paper in Nature, which formalized two strict qualifying criteria used to this day.

To qualify as a biodiversity hotspot, a region must contain at least 1,500 species of vascular plants as endemics (more than 0.5% of the world's total) and must have lost at least 70% of its primary vegetation. As of 2016, 36 biodiversity hotspots have been recognized globally. Despite covering only about 2.4% of Earth's land surface, these hotspots support nearly 60% of the world's plant, bird, mammal, reptile, and amphibian species.

India hosts 4 of the 36 global hotspots: the Himalayas, the Western Ghats, the Indo-Burma region, and Sundaland (represented by the Andaman and Nicobar Islands). Two of these — Indo-Burma and Sundaland — extend well beyond India's borders across Southeast Asia. The concept has become one of the most influential tools in conservation biology for prioritizing limited conservation resources in areas where they can have the greatest impact.

Key Features

# Feature Details
1 Concept origin Norman Myers, 1988; formalized in Nature (2000)
2 Qualifying criteria ≥1,500 endemic vascular plant species + ≥70% original habitat lost
3 Total hotspots 36 globally (as of 2016; 25-year review launched in 2025)
4 Area covered ~2.4% of Earth's land surface
5 Species supported ~60% of world's plant, bird, mammal, reptile, and amphibian species
6 India's hotspots Himalayas, Western Ghats, Indo-Burma, Sundaland
7 Himalayas ~10,000 plant species; ~3,160 endemic; spans India, Nepal, Bhutan
8 Western Ghats ~1,600 km mountain chain; UNESCO World Heritage Site; ~5,000 flowering plants (~1,700 endemic)
9 Indo-Burma Covers parts of NE India, Myanmar, Thailand; high endemism in tropical forests
10 Sundaland Andaman & Nicobar Islands (Indian territory); unique island ecosystems
11 Key funding body Critical Ecosystem Partnership Fund (CEPF) — multilateral hotspot funding
12 Growth timeline 10 hotspots (1988) → 25 (2000) → 34 (2005) → 36 (2016)

Current Status / Latest Data

  • The 36th and newest hotspot, the North American Coastal Plain, was recognized in 2016.
  • A 25-year re-evaluation of the biodiversity hotspots concept was launched at the IUCN World Conservation Congress in October 2025, incorporating new data, metrics, and threat assessments. This review may reclassify or add new hotspots.
  • The Critical Ecosystem Partnership Fund (CEPF) continues to be the primary multilateral funding mechanism for hotspot conservation, having invested over $280 million across hotspot regions since 2000.
  • India's Western Ghats face accelerating threats from mining, linear infrastructure, and plantation expansion. The Kasturirangan Committee (2013) recommended designating 37% of the Western Ghats as an Ecologically Sensitive Area (ESA).
  • The Himalayan hotspot is increasingly threatened by climate change, with glacial retreat, shifting treelines, and biodiversity redistribution toward higher altitudes.
  • Under the Kunming-Montreal Global Biodiversity Framework (2022), Target 3 ("30x30") aims to protect 30% of land and sea by 2030, directly benefiting hotspot regions.
  • The Indo-Burma hotspot is one of the most biologically rich yet least protected, with major threats from deforestation, dam construction, and shifting cultivation in NE India.
  • Globally, biodiversity hotspots have lost on average 86% of their original habitat, making conservation within remaining fragments critically urgent.
  • India's Biodiversity Heritage Sites and Eco-Sensitive Zones provide additional legal protection layers within hotspot areas.
  • The IUCN 25-year review (2025) is expected to incorporate climate vulnerability, connectivity analysis, and updated species data into the hotspot framework.

UPSC Exam Corner

Prelims: Key Facts

  • 36 biodiversity hotspots globally; 4 in India
  • Criteria: ≥1,500 endemic vascular plants + ≥70% habitat loss
  • Concept by Norman Myers (1988); formalized in Nature (2000)
  • Hotspots cover only 2.4% of land but hold ~60% of species
  • Latest hotspot: North American Coastal Plain (2016)
  • CEPF is the key multilateral fund for hotspot conservation
  • Western Ghats: UNESCO World Heritage Site; ~5,000 flowering plants
  • Himalayas: ~10,000 plant species; ~3,160 endemic
  • Sundaland represented by Andaman & Nicobar Islands in India
  • Indo-Burma covers NE India; extends to Myanmar, Thailand, Vietnam

Mains: Probable Themes

  1. Role of biodiversity hotspots in global conservation prioritization and resource allocation
  2. Threats to India's four hotspots — urbanization, infrastructure, mining, and climate change
  3. Balancing development with hotspot conservation — Western Ghats ESA (Kasturirangan Committee) controversy
  4. Significance of the 25-year hotspot re-evaluation for updated conservation frameworks
  5. Hotspot approach vs ecosystem approach — strengths and limitations in conservation planning
  6. Climate change impacts on Himalayan biodiversity — shifting zones and glacial retreat

Why It Matters for UPSC

Biodiversity hotspots are a perennial topic in both Prelims and Mains. Questions frequently test knowledge of the criteria, number of hotspots, India's four hotspots, and the conservation significance of the concept. In Mains, hotspots are linked to broader themes of environmental governance, sustainable development, and India's international biodiversity commitments under the CBD and GBF. The Western Ghats ESA issue is a favourite case study for essays on development vs environment.

Sources: Conservation International, CEPF — Hotspots Defined, Myers et al. 2000, Nature, IUCN Congress 2025