Biodiversity Hotspots: Definition, Criteria, Global & India Map for UPSC (2026)
5 min read
Mar 30, 2026
Introduction
Biodiversity represents the variety of life forms present on Earth including plants, animals, and microorganisms along with the ecosystems they form. However, this diversity is not uniformly distributed across the globe. Certain regions exhibit exceptionally high species richness along with a high degree of endemism (species found nowhere else). These regions, facing significant threats from human activities, are identified as biodiversity hotspots. The concept is crucial in geographical studies as it helps in prioritising conservation efforts in areas where biodiversity is both rich and vulnerable.
Concept of Biodiversity Hotspots
The term "biodiversity hotspot" was introduced by Norman Myers (1988) to identify regions requiring urgent conservation.
A region qualifies as a biodiversity hotspot if it satisfies all of the following criteria:
- Must contain at least 1,500 endemic species of vascular plants
- Must have lost at least 70% of its original natural vegetation
- Represents areas under severe anthropogenic pressure
- Combines high biological richness with high vulnerability
Global Distribution of Biodiversity Hotspots
Biodiversity hotspots are unevenly distributed, largely concentrated in tropical regions due to favourable climatic conditions.
- Currently, there are 36 recognised biodiversity hotspots globally
- These hotspots cover only about 2.4% of Earth's land area
- Yet, they support more than 50% of the world's plant species and nearly 43% of terrestrial vertebrates
- Major regions include tropical rainforests, islands and archipelagos, and mountain regions with varied altitudinal gradients
Major Biodiversity Hotspots of the World
| Hotspot | Key Feature |
|---|---|
| Amazon Basin (South America) | Largest tropical rainforest with immense species diversity |
| Madagascar | Extremely high endemism due to long isolation |
| Southeast Asian Rainforests | Rich in flora and fauna but highly threatened |
| Western Ghats–Sri Lanka | High endemism in amphibians and plants |
| Himalayan region | Diverse ecosystems due to altitudinal variation |
Biodiversity Hotspots in India
India is one of the megadiverse countries and hosts four biodiversity hotspots.
List of Hotspots in India
| Hotspot | Geographical Extent | Key Features |
|---|---|---|
| Himalaya | Jammu & Kashmir to Arunachal Pradesh | High altitudinal diversity, endemic flora and fauna |
| Indo-Burma | Northeast India | Rich in orchids, reptiles, amphibians |
| Western Ghats | Western coastal region | High rainfall, evergreen forests, endemic species |
| Sundaland (Nicobar Islands) | Andaman & Nicobar Islands (Nicobar part) | Tropical rainforests, unique island biodiversity |
Characteristics of Biodiversity Hotspots
Biodiversity hotspots share certain geographical and ecological features:
- Located mostly in tropical and subtropical regions
- Experience high rainfall and favourable climate
- Possess complex ecosystems such as rainforests, coral reefs, and montane forests
- Exhibit high endemism due to isolation (islands/mountains)
- Under threat from deforestation, urbanisation, agricultural expansion, and climate change
Reasons for High Biodiversity in Hotspots
The richness of biodiversity in these regions is influenced by multiple geographical factors:
- Climatic stability over long geological periods
- Varied topography leading to microhabitats
- Isolation (islands/mountains) promoting speciation
- High primary productivity due to favourable temperature and rainfall
- Evolutionary processes such as adaptive radiation
Threats to Biodiversity Hotspots
Despite their importance, hotspots are among the most threatened regions on Earth:
- Habitat destruction due to deforestation and land-use change
- Overexploitation of resources (timber, wildlife)
- Invasive species disrupting native ecosystems
- Climate change altering habitats and species distribution
- Population pressure and unplanned development
Conservation Strategies
Efforts to conserve biodiversity hotspots involve both global and regional approaches:
- Establishment of protected areas such as national parks and biosphere reserves
- Promotion of sustainable development practices
- Community participation in conservation
- International initiatives including the Convention on Biological Diversity (CBD) and UNESCO Biosphere Reserves
- Use of geospatial technologies for monitoring biodiversity
Significance of Biodiversity Hotspots
Biodiversity hotspots are crucial for ecological and geographical sustainability:
- Act as gene pools for future species and crops
- Maintain ecological balance and ecosystem services
- Support climate regulation and carbon sequestration
- Provide livelihoods to indigenous populations
- Serve as natural laboratories for scientific research
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Conclusion
Biodiversity hotspots represent regions where the richness of life coexists with extreme vulnerability. Their geographical distribution highlights the importance of climate, relief, and evolutionary history in shaping biodiversity patterns. As these areas continue to face increasing anthropogenic pressures, their conservation becomes essential — not only for preserving species but also for maintaining ecological stability and ensuring sustainable development.
