Biodiversity Hotspots In IndiaBiodiversity Hotspots In India

Understanding the stringent ecological benchmarks established by Conservation International to classify a region as a biodiversity hotspot.

• Endemism Requirement: A region must contain at least 1,500 species of vascular plants (> 0.5% of the world's total) as endemics, meaning they are found nowhere else on Earth.
• Habitat Loss Criterion: The region must have lost at least 70% of its original primary vegetation, indicating extreme anthropogenic threat and vulnerability.
• Global Significance: Despite covering less than 2.5% of Earth's land surface, hotspots support over 60% of the world's plant, bird, mammal, reptile, and amphibian species.
• Role of Conservation International: Conservation International (CI) acts as the primary governing scientific body monitoring, updating, and funding global hotspot designations.

India is one of the 17 megadiverse countries globally, harbouring parts of four distinct biodiversity hotspots.

• 1. Western Ghats (Sahyadri): Stretches along the western coast of peninsular India across Gujarat, Maharashtra, Goa, Karnataka, Kerala, and Tamil Nadu. Noted for high endemism in amphibians, reptiles, and tropical evergreen flora.
• 2. Eastern Himalayas: Encompasses Bhutan, north-east India, and southern, central China. Extremely rich in alpine flora, orchids, and high-altitude fauna like the Red Panda and Snow Leopard.
• 3. Indo-Burma Region: Spans across north-eastern India (south of Brahmaputra river), Myanmar, Thailand, Vietnam, and Cambodia. Famous for freshwater turtle diversity and large mammal endemism.
• 4. Sundaland: Includes Southeast Asian islands such as Sumatra, Borneo, Java, and the Nicobar Islands group of India. Celebrated for rich marine ecosystems and iconic species like the Orangutan.

Exam questions frequently target the unique flora and fauna restricted strictly to these designated Indian zones.

• Lion-tailed Macaque (Macaca silenus): Endemic to the evergreen forests of the Western Ghats; listed as Endangered on the IUCN Red List, highly sensitive to forest fragmentation.
• Nilgiri Tahr (Nilgiritragus hylocrius): State animal of Tamil Nadu, found exclusively in the high-altitude montane grasslands (Sholas) of the southern Western Ghats.
• Red Panda (Ailurus fulgens): Inhabits the temperate forests of the Eastern Himalayas; feeds heavily on bamboo and faces threats from poaching and habitat loss.
• Major Anthropogenic Pressures: Deforestation for tea/coffee plantations, illegal mining, infrastructure expansion (roads/railways through eco-sensitive zones), and climate shift.