BharatNotes We are living through the sixth mass extinction in Earth's history — the Holocene extinction — caused not by asteroid impact or volcanic eruption but by human activity. Species are disappearing at 100–1,000 times the natural background rate. This biodiversity crisis matters not just for nature's intrinsic value but because biodiversity underpins the ecosystem services — clean water, fertile soil, pollination, climate regulation, disease control — on which human civilisation depends.
This chapter is directly mapped to UPSC GS Paper 3 (environment) questions on biodiversity loss, conservation frameworks, and India's biodiversity governance. It also connects to GS Paper 1 geography questions on distribution of flora and fauna.
PART 1 — Quick Reference Tables
Table 1: Types of Biodiversity
| Type | Definition | Measurement | Examples |
|---|---|---|---|
| Genetic diversity | Variation in genes within a species | Number of alleles per gene; heterozygosity | Different wheat varieties (landraces); tiger population genetics |
| Species diversity | Number and relative abundance of species in an area | Species richness; Shannon–Wiener index | 500 bird species in a forest vs 50 in a park |
| Ecosystem diversity | Variety of habitats, communities, and ecological processes | Number of distinct ecosystems in a region | Forest, wetland, grassland, coastal — each distinct |
Table 2: IUCN Red List Categories
| Category | Code | Definition | Examples (Indian) |
|---|---|---|---|
| Extinct | EX | Last individual died; no evidence of survival | Cheetah (locally extinct in India, 1952; reintroduced 2022) |
| Extinct in the Wild | EW | Survives only in captivity/cultivation | Some freshwater turtles |
| Critically Endangered | CR | Extremely high risk of extinction | Great Indian Bustard, Bengal Florican, Baiji River Dolphin |
| Endangered | EN | High risk of extinction | Bengal Tiger, Asian Elephant, Snow Leopard |
| Vulnerable | VU | High risk, not yet Endangered | Gaur (Indian Bison), Gharial |
| Near Threatened | NT | Close to qualifying for threatened | — |
| Least Concern | LC | Wide distribution, abundant | Common myna, House sparrow |
| Data Deficient | DD | Insufficient information | Many invertebrate species |
| Not Evaluated | NE | Not yet assessed | — |
Table 3: Threats to Biodiversity (HIPPO Framework)
| Threat | Description | India Example |
|---|---|---|
| Habitat loss and degradation | Deforestation, agriculture, urbanisation, wetland drainage | Western Ghats deforestation; Sundarbans erosion |
| Invasive alien species | Non-native species out-compete native species | Lantana camara (invasive shrub in Indian forests), Water hyacinth (freshwater bodies), Parthenium weed |
| Pollution | Air, water, soil pollution affecting organisms | Pesticide impact on pollinators; water pollution killing fish |
| Population growth (human) and overexploitation | Hunting, fishing, poaching; over-extraction of resources | Illegal tiger trade; over-fishing in EEZ |
| Over-exploitation | Direct harvest beyond sustainable levels | Shark-finning, sea cucumber poaching, sandal wood theft |
| Climate change | Habitat shift, phenological mismatch, bleaching, glacial retreat | Coral bleaching in Lakshadweep; habitat shift for Himalayan species |
(HIPPO is a standard mnemonic for biodiversity threats)
Table 4: Conservation Strategies
| Strategy | Type | Definition | Examples |
|---|---|---|---|
| Wildlife sanctuary | In-situ | Protected area allowing some human activity | India has 567 wildlife sanctuaries (as of 2024) |
| National Park | In-situ | Strict protection; no human habitation or resource extraction | 107 National Parks in India (April 2025) |
| Biosphere Reserve | In-situ | Large area with core (strict), buffer, and transition zones | 18 BR in India; 13 in UNESCO MAB network (incl. Cold Desert HP, Sep 2025) |
| Tiger Reserve (Project Tiger) | In-situ | Dedicated management for tiger conservation | 58 tiger reserves (March 2025; NTCA) |
| Community Reserves | In-situ | Community-managed conservation area | Village-level conservation |
| Sacred Groves | In-situ | Traditionally protected patches | Dev vans in India |
| Botanical Garden | Ex-situ | Living plant collection outside natural habitat | Kew Gardens (UK), Lalbagh (Bengaluru) |
| Zoological Park (Zoo) | Ex-situ | Captive animal collection | National Zoological Park (Delhi) |
| Seed Bank | Ex-situ | Preservation of seeds at low temperatures | NBPGR (India), Svalbard Global Seed Vault (Norway) |
| Cryopreservation | Ex-situ | Freezing of gametes, embryos, tissues at –196°C | Tiger sperm banking |
| Captive breeding + reintroduction | Ex-situ → in-situ | Breed in captivity; release into wild | Cheetah reintroduction (2022), Indian Rhino Vision Programme |
Table 5: Key International Conventions and Bodies
| Convention/Body | Year | Purpose | India's role |
|---|---|---|---|
| Convention on Biological Diversity (CBD) | 1992 (Rio Earth Summit) | Framework for conservation, sustainable use, fair sharing of benefits from genetic resources | Party; submitted NBSAP (Biodiversity Action Plan) |
| Nagoya Protocol | 2010 | ABS (Access and Benefit Sharing) — regulates use of genetic resources | Ratified 2012 |
| CITES | 1973 | Regulates international trade in endangered species; 3 Appendix levels | Party; enforces Wildlife Protection Act |
| Ramsar Convention | 1971 | Wetland conservation; "Wetlands of International Importance" | 99 Ramsar sites (as of April 2026; PIB PRID 2254357) |
| CMS (Migratory Species) | 1979 | Protects migratory animals across national borders | Party; listed many Indian migratory species |
| World Heritage Convention (UNESCO) | 1972 | Designates cultural and natural world heritage sites | Many WH Sites in India |
| IPBES | 2012 | Intergovernmental science-policy platform for biodiversity (equivalent of IPCC for nature) | Member; IPBES 2019 report: 1 million species threatened |
PART 2 — Detailed Notes
Why Biodiversity Matters: Ecosystem Services
Biodiversity is not merely an aesthetic concern — it underpins ecosystem services that sustain human welfare:
Provisioning services: Food (crops, livestock, fish, game), water, medicines (80% of drugs have natural origins), raw materials (timber, fibre, rubber).
Regulating services: Climate regulation (forests store carbon), water purification (wetlands filter pollutants), flood control (mangroves buffer storm surge), pollination (~35% of global food production depends on animal pollination), pest control (natural predators).
Supporting services: Soil formation, nutrient cycling, primary production — the foundations underlying all other services.
Cultural services: Recreation, tourism, aesthetic value, spiritual significance.
The Economics of Ecosystems and Biodiversity (TEEB) project estimates that ecosystem services are worth trillions of dollars annually — far exceeding the economic gains from exploiting or destroying them.
💡 Explainer: Genetic Diversity and Agricultural Security
Genetic diversity within crop species is the raw material for plant breeding — the source of resistance genes to new pests and diseases, drought tolerance, and yield improvements. India's traditional varieties (landraces) of rice, wheat, and millets contain invaluable genetic material:
- The Kuttanad wetlands of Kerala preserve unique flood-tolerant rice varieties
- The North East is the centre of diversity for many cultivated plants (rice, jute, banana, citrus)
- Loss of landraces (replaced by high-yield varieties) is genetic erosion — narrowing the genetic base of agriculture
The Green Revolution of the 1960s–70s increased yields dramatically but reduced genetic diversity (fewer varieties planted). This creates vulnerability — a single pathogen could devastate a genetically uniform crop.
IUCN Red List: Assessment Process
The IUCN (International Union for Conservation of Nature) Red List is the world's most comprehensive inventory of the conservation status of species. Assessment criteria include:
- Rate of population decline
- Geographic range size (area of occupancy, extent of occurrence)
- Small population size and fragmentation
- Quantitative probability of extinction
India has ~3,000+ animal species on the IUCN Red List. Critical cases:
- Great Indian Bustard: Critically Endangered; ~173 globally (2025 estimate; BirdLife International); Jaisalmer alone recorded 198 including captive birds (April 2025 survey); threatened by power lines, habitat loss in Rajasthan and Gujarat
- Gangetic River Dolphin: Endangered; India's National Aquatic Animal; threatened by river pollution, dams, fishing nets
- Snow Leopard: Vulnerable; ~450–500 in India (Ladakh, Himachal Pradesh, Uttarakhand, Sikkim, Arunachal Pradesh)
In-situ Conservation: India's Protected Area Network
India has a tiered Protected Area system:
National Parks: Highest level of protection. No human habitation, grazing, or resource extraction inside core area. 107 national parks (April 2025) covering ~1.25% of India's area. Examples: Jim Corbett (first, 1936), Kanha, Kaziranga, Sundarbans, Great Himalayan NP.
Wildlife Sanctuaries: Allow limited human activity (non-destructive). 567 sanctuaries covering ~4% of area. May have human settlements with regulated use.
Biosphere Reserves: UNESCO concept — integrate conservation with sustainable development. Core zone (strict), buffer zone (limited research/tourism), transition zone (human settlements). India has 18 BRs; 13 designated in UNESCO MAB Programme (Cold Desert, Himachal Pradesh added September 2025). Examples: Nilgiri (first, 1986), Sundarbans, Gulf of Mannar, Great Nicobar, Nanda Devi.
Tiger Reserves (Project Tiger): Launched in 1973 with 9 reserves; now 58 reserves across 18 states (March 2025; NTCA; 58th = Madhav National Park, MP). India's tiger population has grown from ~1,800 (2010) to ~3,682 (2022 census; next census 2026, report expected 2027) — a global conservation success story.
Community Reserves and Conservation Reserves: New categories under Wildlife Protection Act (Amendment) 2002, recognising community-led conservation.
🎯 UPSC Connect: India's Biodiversity Governance
Biological Diversity Act, 2002: India's primary domestic law implementing CBD commitments:
- Establishes National Biodiversity Authority (NBA) at national level
- State Biodiversity Boards (SBBs) at state level
- Biodiversity Management Committees (BMCs) at local body level — prepare People's Biodiversity Register (PBR)
- Regulates access to India's biological resources and traditional knowledge; requires prior informed consent
National Biodiversity Strategy and Action Plan (NBSAP) 2008–2020: India's implementation plan for CBD. Updated as India works toward the Kunming–Montreal Global Biodiversity Framework (GBF) targets adopted at COP15 (2022):
- 30×30: Protect 30% of land and oceans by 2030
- Halt and reverse biodiversity loss by 2030
- Mobilise US$200 billion/year for biodiversity
Key species programmes:
- Project Tiger (1973): Success story
- Project Elephant (1992): ~30,000 elephants; 33 Elephant Reserves
- Project Crocodile (1975): Mugger, Saltwater, Gharial
- Sea Turtle Conservation: Marine turtle nesting sites on Odisha coast (Olive Ridley mass nesting — arribada — at Gahirmatha)
- Cheetah Reintroduction (2022): 20 Namibian and South African cheetahs brought to Kuno National Park (Madhya Pradesh) — first major wildlife translocation across continents
Ex-situ Conservation: Off-site Protection
Ex-situ conservation keeps organisms outside their natural habitat:
- Seed banks: India has the National Bureau of Plant Genetic Resources (NBPGR) in Delhi, with over 4 lakh seed accessions. Globally, the Svalbard Global Seed Vault (Norway) is the "Noah's Ark" for seeds.
- Gene banks: Store genetic material (DNA, gametes, embryos) of threatened species
- Captive breeding: Zoos operate captive breeding programmes; Central Zoo Authority oversees India's zoos
- Botanical and zoological gardens: Scientific collections; education; research; conservation breeding
PART 3 — Frameworks & Analysis
In-situ vs Ex-situ Conservation: Comparison
| Feature | In-situ | Ex-situ |
|---|---|---|
| Location | Natural habitat | Outside natural habitat |
| Evolutionary adaptation | Species continues to adapt | Adaptation frozen; genetic drift risk |
| Scale | Can cover large populations | Limited by space/resources |
| Cost | Lower per species in large reserves | Higher per individual |
| Natural processes | Maintained | Disrupted |
| Best for | Wild populations; ecosystem processes | Critically endangered; genetic backup |
| Examples | National Parks, Tiger Reserves | Zoos, seed banks, gene banks |
Biodiversity Threats and Conservation Responses
| Threat | Conservation Response | Policy/Programme |
|---|---|---|
| Habitat loss | Protected areas; EIA mandates | Wildlife Protection Act; Forest Conservation Act |
| Poaching | Anti-poaching patrols; trade controls | CITES; Wildlife Crime Control Bureau |
| Invasive species | Removal programmes; biosecurity | Invasive Alien Species policy (under development) |
| Climate change | Habitat corridors; assisted migration | Climate Vulnerability Mapping |
| Overexploitation | Quotas; sustainable harvest | Fisheries Act; Forest Rights Act |
| Genetic erosion | Seed banks; landrace conservation | NBPGR; NBSAP |
Exam Strategy
Prelims Traps:
- IUCN Red List categories in order: EX → EW → CR → EN → VU (the "threatened" categories) → NT → LC → DD → NE.
- Critically Endangered ≠Extinct. Great Indian Bustard is CR (critically endangered), not extinct.
- In-situ = conservation in the natural habitat. Ex-situ = conservation outside natural habitat.
- Biosphere Reserve ≠National Park: BR has three zones; NP has strict no-use policy in core; BR allows human activity in transition zone.
- Convention on Biological Diversity (CBD) = 1992, Rio. CITES = 1973, regulates international trade (not CBD).
- The Nagoya Protocol under CBD deals specifically with Access and Benefit Sharing (ABS) of genetic resources.
Mains Frameworks:
- Biodiversity loss question: HIPPO threats framework → ecosystem services at risk → India-specific data (tiger census, bustard decline) → conservation measures → international frameworks (CBD, GBF 30×30).
- Protected areas in India: 3-level system (NP, Sanctuary, BR) + community reserves → coverage statistics → challenges (encroachments, corridors).
- For "why is biodiversity loss a crisis" type questions: quantitative (species extinction rate 100–1,000× background) + qualitative (ecosystem services) + examples from India.
Practice Questions
- UPSC Prelims 2022: The Kunming–Montreal Global Biodiversity Framework sets a target to protect what percentage of land and oceans by 2030? (30%)
- UPSC Prelims 2019: The Great Indian Bustard is listed in which category of the IUCN Red List? (Critically Endangered)
- UPSC Mains GS3 2021: What is the significance of in-situ and ex-situ conservation of biodiversity? Discuss with reference to India's conservation efforts.
- UPSC Mains GS3 2023: Discuss the threats to biodiversity in India and the policy measures in place to address them.
