Biodiversity Hotspots of India

The concept of a biodiversity hotspot originates with the British ecologist Norman Myers, who introduced it in a 1988 paper in The Environmentalist and refined it with Conservation International in the landmark 2000 Nature paper "Biodiversity hotspots for conservation priorities." A region qualifies on two strict criteria: it must contain at least 1,500 species of vascular plants as endemics (more than 0.5 percent of the world's total), and it must have lost at least 70 percent of its original primary vegetation. Of the 36 hotspots currently recognized worldwide, four extend into Indian territory: the Western Ghats, the Himalaya, the Indo-Burma region, and Sundaland (specifically the Nicobar group of islands). India's domestic legal architecture for protecting these zones rests on the Wildlife (Protection) Act, 1972, the Biological Diversity Act, 2002, the Forest (Conservation) Act, 1980, and the Environment (Protection) Act, 1986, supplemented by India's obligations under the Convention on Biological Diversity, which it ratified in 1994.

The designation itself is a scientific and prioritization exercise rather than a legal instrument. Conservation International compiles species inventories—drawing on national floras, IUCN assessments, and field surveys—and tests each candidate region against the endemism and habitat-loss thresholds. Once a region clears both bars, it is mapped against political boundaries so that national governments can align protected-area networks with hotspot extents. In India, the mechanics of on-ground protection then proceed through notification: a state or the Union government declares national parks and wildlife sanctuaries under the Wildlife (Protection) Act, designates Eco-Sensitive Zones around protected-area peripheries under the Environment (Protection) Act, and constitutes Biodiversity Management Committees and the National Biodiversity Authority under the 2002 Act to regulate access and benefit-sharing.

Beyond the four global hotspots, India layers additional conservation categories that practitioners must not conflate with the hotspot concept. The country has 18 biosphere reserves under the UNESCO Man and the Biosphere Programme, of which the Nilgiri, Nanda Devi, Sundarbans, Gulf of Mannar, and others overlap the hotspots. India also identifies "megadiverse" status—it is one of 17 megadiverse countries—and maintains a network of Tiger Reserves under Project Tiger (1973) and the National Tiger Conservation Authority. The Western Ghats additionally secured UNESCO World Heritage status in 2012, with 39 serial sites inscribed across Kerala, Karnataka, Tamil Nadu, and Maharashtra.

Contemporary administration is visible in specific decisions. The Ministry of Environment, Forest and Climate Change in New Delhi has repeatedly grappled with the Western Ghats following the Madhav Gadgil-led Western Ghats Ecology Expert Panel report (2011) and the subsequent Kasturirangan High-Level Working Group report (2013), which recommended that roughly 37 percent of the Ghats be designated Ecologically Sensitive Area—a draft notification the Ministry has reissued multiple times through 2022 and 2024 without final settlement amid resistance from the six concerned states. In the Himalaya, the Eastern Himalayan stretch through Arunachal Pradesh, Sikkim, and northern West Bengal anchors hotspot coverage, while the Indo-Burma hotspot covers the entire Northeast east of the Brahmaputra, including Manipur, Mizoram, and Nagaland.

The hotspot must be distinguished from adjacent concepts. A biosphere reserve is a managed zonation unit (core, buffer, transition) under a UNESCO programme, whereas a hotspot is a prioritization label with no statutory zoning. An Ecologically Sensitive Area or Eco-Sensitive Zone is a notified regulatory buffer under Indian law, which a hotspot is not. A "megadiverse country" measures national-scale richness, not endemism-plus-threat at the regional scale. Critically, a hotspot's defining feature is the combination of irreplaceability (high endemism) and vulnerability (severe habitat loss)—a pristine, intact region of high diversity would not qualify because it has not crossed the 70 percent loss threshold, a point that distinguishes hotspots from "high-biodiversity wilderness areas," a separate category Myers and colleagues defined.

Controversies center on whether the hotspot framework, by privileging vascular-plant endemism, under-weights freshwater, marine, and invertebrate diversity, and whether it diverts funding from biodiverse but non-qualifying regions. Within India, the Gadgil-versus-Kasturirangan dispute exposed a recurring tension between strict ecological zoning and the livelihood claims of an estimated 50 million people living within the Western Ghats. Recent developments include continued fragmentation pressure from linear infrastructure—roads, transmission lines, and the proposed projects in the Andaman and Nicobar (Sundaland) hotspot under the NITI Aayog "Great Nicobar" development plan, which received environmental clearance in 2022 and drew sustained scientific criticism over the loss of primary rainforest and impacts on the Nicobar megapode and Leatherback turtle.

For the working practitioner—whether a UPSC GS3 candidate, a desk officer, or a policy researcher—the four-hotspot framework is the organizing scaffold for India's environmental diplomacy and domestic conservation policy. It frames India's positions at the Conference of the Parties to the Convention on Biological Diversity, including commitments under the Kunming-Montreal Global Biodiversity Framework adopted in 2022 with its "30 by 30" protected-area target. Mastery requires holding three layers simultaneously: the global scientific criteria and the names of the four regions, the Indian statutory instruments that translate priority into protection, and the live administrative disputes—Western Ghats ESA notification, Great Nicobar—where conservation science collides with development imperatives and federal politics.