Biodiversity Hotspots & Species Recovery — India's Conservation Success

Biodiversity Hotspot — Concept and Criteria

The concept of biodiversity hotspots was introduced by British ecologist Norman Myers in two articles in The Environmentalist in 1988 and 1990. The concept was refined and formalised in the landmark paper published in Nature in 2000.

Myers' Two Strict Criteria

To qualify as a biodiversity hotspot, a region must meet both criteria:

1. Endemism: Must contain at least 1,500 species of vascular plants as endemics (representing more than 0.5% of the world's total vascular plant species)
2. Habitat loss: Must have already lost at least 70% of its primary (original) vegetation

The rationale: conservation resources are limited — they should be focused on areas that are both extraordinarily rich in endemic species and under severe threat.

Global Status

• Total global biodiversity hotspots: 36 (as currently recognised by Conservation International)
• These 36 hotspots cover only 2.4% of Earth's land surface
• Yet they support nearly 60% of the world's plant, bird, mammal, reptile, and amphibian species — with a large proportion of those species as endemics

India's Four Biodiversity Hotspots

India is one of the world's 17 mega-diverse countries. It is represented in 4 of the 36 global biodiversity hotspots:

1. Western Ghats & Sri Lanka
2. Eastern Himalayas (Himalayas Hotspot)
3. Indo-Burma
4. Sundaland (Andaman & Nicobar Islands component)

1. Western Ghats & Sri Lanka

The Western Ghats run parallel to India's western coast for about 1,600 km through Kerala, Tamil Nadu, Karnataka, Goa, Maharashtra, and Gujarat.

Key Features

Key Fauna

• Lion-tailed macaque, Nilgiri langur, Nilgiri tahr
• Malabar large-spotted civet (critically endangered)
• Purple frog (Nasikabatrachus sahyadrensis) — a living fossil
• Kalakad Mundanthurai Tiger Reserve, Periyar Tiger Reserve, Parambikulam Tiger Reserve

Threats

• Infrastructure development (roads, dams, mines — Western Ghats Ecology Expert Panel "Gadgil Report" 2011)
• Encroachment, plantation monocultures (eucalyptus, rubber, coffee)
• Climate change — monsoon pattern disruption

2. Eastern Himalayas (Himalayas Hotspot)

Covers Bhutan, northeastern India (Sikkim, Arunachal Pradesh, parts of Assam), and parts of Nepal and southern China.

Key Features

Key Fauna

• Red panda, snow leopard, Takin, Black-necked crane
• One-horned rhinoceros (Kaziranga National Park, Assam)
• Hoolock gibbon (India's only ape)

Significance

• Contains the headwaters of major rivers — the Brahmaputra, Ganga tributaries
• Critical for regional water security
• One of the most biologically diverse mountain systems on Earth

3. Indo-Burma Hotspot

Covers northeastern India (Manipur, Mizoram, Nagaland, Meghalaya, Tripura, and parts of Assam), Myanmar, Thailand, Laos, Cambodia, Vietnam, and southern China.

Key Features

• Approximately 13,500 endemic plant species
• High freshwater biodiversity — harbours 1,260 freshwater fish species
• Contains many species discovered recently (late discovery rate — a sign of under-exploration)
• Key threatened species: Irrawaddy dolphin, Asian elephant, tigers, gibbons

India's portion

• Dzukou Valley, Loktak Lake (only floating national park — Keibul Lamjao NP), Namdapha National Park (Arunachal Pradesh — India's largest national park in Northeast)

4. Sundaland

The global Sundaland hotspot covers the western half of the Indo-Malayan Archipelago — Borneo, Sumatra, Java, and other islands. India's contribution is the Andaman & Nicobar Islands (part of the Sundaland biogeographic zone).

India's Nicobar Component

Project Tiger

Launched: 1973 under Prime Minister Indira Gandhi Governing body: National Tiger Conservation Authority (NTCA), established under Wildlife Protection Act (Amendment) 2006 Legal basis: Wildlife Protection Act, 1972 (as amended)

Tiger Population Trend

India holds ~75% of the world's wild tiger population. The 2022 census used camera traps and recorded 3,080 unique individuals photographed, with a minimum population estimate of 3,682.

Tiger Reserves — Current Count

As of 2025, India has 58 tiger reserves across 18 states. Recent additions:

• 54th: Dholpur-Karauli (Rajasthan) — 2023
• 55th–57th: Ratapani (MP), Veerangana Durgavati (MP), and Guru Ghasidas-Tamor Pingla (CG/MP) — 2024
• 58th: Madhav National Park (Madhya Pradesh) — March 2025 (MP now has the most reserves nationally at 9)

Core-Buffer Zone Structure

Each tiger reserve has:

• Core/Critical Tiger Habitat (CTH): Inviolate area — no human habitation or resource extraction allowed
• Buffer zone: Allows co-existence of human use with conservation (eco-tourism, regulated NTFP collection)

NTCA Functions

• Prepare tiger conservation plan
• Ensure inviolacy of core areas
• Commission independent audits
• Submit report to Parliament
• Address human-wildlife conflict

Project Elephant

Launched: 1992 as a Centrally Sponsored Scheme under the Ministry of Environment, Forest and Climate Change

Objective: Protect elephants and their habitats, address human-elephant conflict, and manage captive elephants

Elephant Reserves: As of 2023, 33 Elephant Reserves (ERs) notified across 14 states, covering approximately 80,778 sq km

Key states: Assam, West Bengal, Jharkhand, Odisha, Chhattisgarh, Uttarakhand, Himachal Pradesh, Karnataka, Kerala, Tamil Nadu

"Gaj Yatra": A public outreach campaign for elephant conservation

Estimated elephant population: ~22,446 (WII DNA-based SAIEE census 2021–25, released October 2025) — India holds the largest Asian elephant population in the world; the DNA-based methodology establishes a new scientific baseline not directly comparable to the 2017 headcount of ~27,312 (synchronised physical count), which used an entirely different approach

Key Threats

• Habitat fragmentation due to railways, highways, and human settlements
• Electrocution by illegal electric fences
• Poaching for ivory (males only have tusks)
• Human-elephant conflict — crop raiding, retaliatory killings

Snow Leopard Conservation

Range: Snow leopards are found in 12 countries across Central and South Asia.

India's 5 range states/UTs: Jammu & Kashmir (including Ladakh), Himachal Pradesh, Uttarakhand, Sikkim, and Arunachal Pradesh

India's snow leopard population: The Snow Leopard Population Assessment in India (SPAI 2019–2023) — India's first nationwide survey — recorded 718 snow leopards across six Himalayan states, covering 70% of potential habitat. (Ladakh, which was included as a UT in this census, accounts for the highest share.)

IUCN Status: Vulnerable

National programme: India is part of the Global Snow Leopard & Ecosystem Protection (GSLEP) Programme (launched 2013) — a 12-country partnership.

Threats: Poaching, retaliatory killing (by herders whose livestock are attacked), habitat loss, climate change (upward shift of prey base and human settlements)

Vulture Conservation

India's vulture population collapsed catastrophically in the 1990s–2000s — one of the fastest population declines in bird history.

The Diclofenac Crisis

Cause: Veterinary use of diclofenac (an NSAID anti-inflammatory drug used in cattle) was found to cause visceral gout and acute kidney failure in vultures that fed on carcasses of treated cattle.

Population decline: White-backed vulture population fell by 99.9% between 1993 and 2007.

India's response: Veterinary diclofenac was banned in 2006. Additional NSAIDs toxic to vultures (aceclofenac, ketoprofen) were banned in 2023.

Species and Status

India has 9 species of vultures:

• Gyps species (White-backed, Long-billed, Slender-billed, Himalayan, Egyptian) — IUCN Critically Endangered / Endangered
• King vulture, Red-headed vulture, Bearded vulture, Cinereous vulture

Breeding centres: Established in Pinjore (Haryana), Rani (Assam), Bhopal (Madhya Pradesh), and Hyderabad for ex-situ conservation.

Vulture-safe zones: Areas in Rajasthan and Madhya Pradesh designated vulture-safe by banning harmful drugs.

Vulture Action Plan 2020–25: Recommends ban on additional vulture-toxic drugs, establishment of more "Jatayu Conservation Breeding Centres", and community-based monitoring.

Great Indian Bustard (GIB) Recovery

Status: Critically Endangered (IUCN); listed on Schedule I of the Wildlife Protection Act, 1972

Population: Approximately 150 individuals remain in the wild (as of 2024-25), primarily in Rajasthan (Desert National Park) and Gujarat.

Threats:

• Overhead power lines (birds collide — their forward-facing eyes cannot detect lines)
• Habitat loss to agriculture, wind energy farms, fencing
• Egg and chick predation

Supreme Court intervention: In M.K. Ranjitsinh v. Union of India (2021), the Supreme Court initially ordered underground cabling of power lines in GIB habitat. The order was later modified given energy transition concerns — a special committee was formed to identify priority zones for undergrounding.

Conservation Breeding Programme: MoEF&CC established India's first GIB conservation breeding facility at Sam Conservation Centre, Jaisalmer (Rajasthan) in 2019 in collaboration with the Wildlife Institute of India (WII) and the International Fund for Houbara Conservation (IFHC). The first captive-born chick was successfully raised in 2025 — a major milestone.

Project Great Indian Bustard: State government initiative in Rajasthan to protect the remaining habitat.

Gangetic River Dolphin

Status: India's National Aquatic Animal (declared 2009)

Species: Platanista gangetica gangetica — a freshwater dolphin, functionally blind, uses echolocation

Population: Estimated 6,324 individuals across the Ganga-Brahmaputra river system (WII survey 2021–23, released 2024 under Project Dolphin)

Threats: River pollution, overfishing of prey species, entanglement in fishing nets, siltation, river barriers (dams, barrages), boat traffic

Conservation: Protected under Schedule I of WPA 1972; Project Dolphin launched by PM Modi in 2020

Critical Tiger Habitat (CTH) and Eco-Sensitive Zones (ESZ)

Critical Tiger Habitat (CTH):

• The inviolate core area of a tiger reserve
• Notified under Section 38V of the Wildlife Protection Act
• No human habitation or resource extraction allowed
• Provides safe breeding grounds

Eco-Sensitive Zones (ESZ):

• Buffer areas around Protected Areas (PAs) notified under Environment Protection Act, 1986
• Regulate activities that could negatively impact the PA
• The Supreme Court ruled (2022) that a mandatory ESZ of at least 1 km around every PA must be maintained unless a higher limit is notified

Previous Year Questions (PYQs)

Prelims

1. (UPSC Prelims 2021) Consider the following: 1) Biodiversity hotspots 2) Eco-Sensitive Zones 3) Elephant Corridors. Which of the above are considered while determining the eco-sensitive zones? (Tests knowledge of ESZ criteria)

2. (UPSC Prelims 2018) Which one of the following is a part of the Indo-Burma biodiversity hotspot? — (Manipur) — Tests knowledge of India's coverage of Indo-Burma hotspot

3. (UPSC Prelims 2014) "Project Tiger" was launched in 1973 primarily with the objective of: — (Protecting tigers from poaching and preserving their natural habitats)

Mains

1. (GS3, 2020) How is biodiversity different at the genetic, species, and ecosystem levels? Examine the role of biodiversity hotspots in conservation.

2. (GS3, 2019) What is the significance of biodiversity to India's economy? Discuss the threats to biodiversity and the steps taken for its conservation.

3. (GS3, 2015) What is a biodiversity hotspot? Explain the key criteria used to designate an area as a hotspot and list the hotspots in India.

Cross-paper relevance

• GS3 — Environment (primary) — India's 4 biodiversity hotspots (Western Ghats + Sri Lanka, Indo-Burma, Himalaya, Sundaland overlap); species recovery programmes (Project Tiger, Snow Leopard, Gangetic Dolphin)
• GS2 — Policy: NBSAP (National Biodiversity Strategy and Action Plan); Kunming-Montreal GBF 30x30 target; Wildlife Crime Control Bureau (WCCB)
• GS1 — Geography — Endemic species richness in hotspots; geographic corridors for species movement; climate change as range-shifter
• Essay — "A species lost is a story lost — extinction is irreversible" (recurring)

Recent Developments (2024–2026)

CBD COP16 Cali 2024 and Rome 2025 — Hotspot Conservation and 30×30 Framework

CBD COP16 (October–November 2024, Cali, Colombia) accelerated focus on biodiversity hotspot conservation through the Kunming-Montreal Global Biodiversity Framework's (KMGBF) Target 2 (restoring at least 30% of degraded terrestrial, inland water, and coastal ecosystems by 2030) and Target 3 (protecting 30% of land and oceans by 2030 — the 30×30 goal).

India submitted its updated National Biodiversity Strategies and Action Plan (NBSAP) at COP16, committing to strengthen the Protected Area network, enhance community-based conservation through "Other Effective Conservation Measures" (OECMs), and integrate biodiversity considerations into 14 high-impact sectors. India's two biodiversity hotspots — the Western Ghats and the Eastern Himalayas/Indo-Burma region — are specifically prioritised for landscape-level restoration planning.

The Cali session ended without agreement on biodiversity finance. The resumed session (Rome, 25–27 February 2025) completed the unfinished agenda:

• Countries agreed to mobilise at least $200 billion per year by 2030 for biodiversity globally.
• A permanent biodiversity finance arrangement for developing nations was created — extending beyond the 2030 KMGBF horizon.
• The full set of KMGBF indicators and the PMRR mechanism (Planning, Monitoring, Reporting and Review) were finalised.
• 30% ecosystem restoration target (KMGBF Target 2) was formally adopted.

UPSC angle: COP16 two-session structure (Cali Oct 2024 + Rome Feb 2025 resumed); $200bn/year biodiversity finance strategy; Cali Fund (DSI benefit-sharing); IPLC permanent subsidiary body; 30×30 goal; OECMs concept; India's NBSAP 2024 — direct Mains GS-3 content; OECMs and PMRR are emerging Prelims terminology.

Western Ghats Ecology Panel Recommendations — Follow-up 2024

The Western Ghats, spanning 1,60,000 sq km across six states (Gujarat, Maharashtra, Goa, Karnataka, Kerala, Tamil Nadu), remains one of the world's 34 biodiversity hotspots with over 5,000 species of flowering plants, 139 mammal species, and 508 bird species. Following the Kasturirangan Committee Report (2013) and subsequent state-level consultations, MoEFCC in 2024 continued consultations on Ecologically Sensitive Area (ESA) demarcation.

As of 2024, approximately 56,825 sq km has been notified as ESA in various phases, with debates ongoing over the extent of restrictions on mining, quarrying, and development activities in the region. The Western Ghats faces significant threats from invasive species (Lantana camara covers over 2 million hectares), illegal sand mining, and encroachment.

UPSC angle: Western Ghats ESA controversy, Kasturirangan vs Madhav Gadgil panel distinctions, and UNESCO World Heritage Site status (since 2012) are high-priority Mains topics.

Species Recovery — Why Some Work and Others Don't: The Pattern Behind India's Data

(The population figures — snow leopard 718 (SPAI 2019–23), Gangetic dolphin 6,324 (WII 2021–23), GIB ~150, one-horned rhino ~3,262 in India/4,075 globally, tiger 3,682 (2022) — are covered in the individual species sections above. This section analyses why some species show recovery while others remain in crisis.)

India's species recovery record reveals a clear pattern when you compare the successes (tiger, one-horned rhino) against the ongoing crises (GIB, gharial):

Recovery success factors: Tiger and one-horned rhino share three traits — (1) concentrated habitat that can be inviolate-zoned (Kaziranga, Project Tiger reserves), (2) single primary threat that was addressable (poaching — addressed via anti-poaching infrastructure), and (3) species naturally reproduce at rates that can outpace mortality. The rhino recovery from ~1,200 (early 1900s) to 4,075 globally is probably the greatest large mammal conservation story in Asia.

Crisis persistence factors: GIB and gharial remain in crisis because their primary threats are infrastructure-driven and spatially diffuse — GIB is killed by power lines spread across a vast landscape, gharial by river dams and fishing nets across entire river systems. No inviolate zone can fix a transmission line grid. The Supreme Court's 2021 order on underground cabling for GIB habitats — modified after energy transition objections — illustrates how species recovery now requires regulatory trade-offs the 1973 Project Tiger model was never designed to navigate.

The new frontier — climate overlap: The snow leopard's 718 population faces a threat that wasn't present in the original conservation framework: climate-driven upward migration of treeline and prey species into the snow leopard's high-altitude habitat. Even with zero poaching, the habitat may shrink by 30% by 2050 under high-emissions scenarios (source: WWF Snow Leopard Survey 2023 modelling). This is the conservation challenge that no protected area designation alone can address.

UPSC angle: For Mains — the divergence between tiger/rhino recovery success and GIB/gharial crisis persistence is a high-value analytical argument; climate change as a third-generation conservation challenge (beyond poaching and habitat loss) is an emerging Mains theme.

Great Nicobar Island Holistic Development Project — Conservation vs Development Flashpoint (2024–2026)

The Great Nicobar Island Holistic Development Project, approved by the Government of India and implemented by ANDAMAN AND NICOBAR Islands Integrated Development Corporation (ANIIDCO), is the most contentious conservation-development conflict in India's recent history — directly implicating biodiversity hotspot integrity, endemic species survival, and India's obligations under CBD and CITES.

Project components:

Endemic species at risk:

The Godavarman–FCA–EIA nexus: The project's environmental clearance (2022) was challenged as inadequate on multiple grounds — the 1,000+ page EIA was criticised for insufficient baseline ecological data on leatherback nesting, the absence of a comprehensive disaster risk assessment for earthquake-prone area, and denotification of the Galathea Bay Wildlife Sanctuary and the Megapode Sanctuary specifically to enable the project.

NGT ruling (16 February 2026): The National Green Tribunal ruled in favour of the project, citing "adequate safeguards" and strategic importance, and declined to interfere with the 2022 environmental clearance. The NGT imposed conditions on construction timing (outside turtle nesting seasons), lighting restrictions, and new compensatory sanctuaries on Little Nicobar, Menchal, and Meroe islands. Environmental groups and petitioners are expected to challenge the ruling before the Supreme Court.

Conservation tension: The project exemplifies a structural conflict between India's biodiversity commitments (NBSAP submitted at CBD COP16 Cali, 2024; 30×30 goal; KMGBF targets) and its strategic/economic interests in the Indian Ocean. Internationally, leatherback sea turtles are listed under Appendix I of CITES — the strongest protection category; this creates a potential diplomatic dimension if India's actions are seen as inadequately protecting a CITES Appendix I species's critical nesting ground.

UPSC angle (Mains GS3): Great Nicobar project — key components and strategic rationale; conservation conflicts (leatherback turtle Galathea Bay nesting, Nicobar megapode); denotification of sanctuaries; NGT ruling February 2026; pending SC challenge; India's NBSAP commitments vs infrastructure imperatives. Prelims — leatherback turtle (Vulnerable IUCN, Schedule I WPA); Nicobar megapode (Vulnerable IUCN, endemic); Galathea Bay Wildlife Sanctuary denotified 2022.

CITES CoP20 — Samarkand 2025 and India's Species

(Comprehensive CITES CoP20 coverage is in Biodiversity and Conservation and Wildlife Conservation. Key hotspot-relevant facts:)

At CITES CoP20 (Samarkand, Uzbekistan, 24 Nov–5 Dec 2025), the whale shark (Rhincodon typus) — which occurs in India's coastal waters and the Lakshadweep Sea — was elevated to Appendix I (complete trade ban) from Appendix II. India's Western Ghats coastline is a known whale shark habitat. The oceanic whitetip shark was also elevated to Appendix I.

Critically for India's biodiversity hotspots, India successfully opposed the EU's proposal to list guggul (Commiphora wightii) — a plant native to the arid biodiversity corridors of Rajasthan and Gujarat (part of the Indo-Gangetic transition zone adjacent to the hotspot fringe) — in Appendix II, arguing the proposal lacked adequate scientific baseline data. This was significant for communities depending on guggul resin (used in Ayurvedic medicines and exported commercially).

UPSC angle: Prelims — whale shark in India's waters (Schedule I WPA + now CITES Appendix I, 2025); guggul native to Rajasthan/Gujarat; CITES CoP20 Samarkand 2025.

Invasive Species Threat to Biodiversity Hotspots — 2024 Assessment

A 2024 research study (published in Nature Sustainability) highlighted that India's natural areas are losing approximately 15,500 sq km per year to invasive plant species. Lantana camara is the most widespread, infesting over 13 million hectares (approximately 4% of India's land area), followed by Prosopis juliflora and Chromolaena odorata (expanding fastest at 1,988 sq km/year). These species are particularly severe threats in biodiversity hotspot areas, displacing native flora and altering habitat structure.

The MoEFCC's National Action Plan for Invasive Alien Species mandates state forest departments to conduct systematic surveys and removal programmes. However, implementation remains patchy due to limited capacity and scale of infestation. IUCN lists Lantana camara among the world's 100 most invasive species and among the world's 10 worst weeds.

UPSC angle: Invasive species impacts on hotspots, specific species names (Lantana, Mikania, Prosopis), and the link to biodiversity loss are Prelims and Mains topics.

Exam Strategy

For Prelims: Memorise India's 4 hotspots, Norman Myers' two criteria (1500 endemic plants + 70% habitat loss), and key stats (58 tiger reserves; 2022 tiger census 3,682 — latest published, 6th AITE ongoing; elephant DNA census 2025 = 22,446; 33 elephant reserves; cheetahs 57 as of May 2026 from 3 countries). Also note: CITES CoP20 Samarkand, Uzbekistan (24 Nov–5 Dec 2025) — whale shark + oceanic whitetip → Appendix I; India opposed guggul listing.

For Mains GS3:

• Use the criteria → India's hotspots → species recovery programmes structure
• Connect biodiversity loss to climate change (additional pressure on already-threatened ecosystems)
• Mention specific court interventions (GIB, ESZ rulings)
• Discuss tension between development and conservation — infrastructure, renewable energy vs habitat preservation

Key facts for answer enrichment:

• India = 2.4% of world's land area but harbours 7-8% of all recorded species; 91,212 animal species and 45,500 plant species recorded
• India is a mega-diverse country (one of 17 globally)
• 36 global hotspots on 2.4% of Earth's surface support 60% of terrestrial species
• Tiger recovery: 1,411 (2006) → 3,682 (2022) — a conservation success story

Do not confuse:

• Western Ghats & Sri Lanka hotspot ≠ just Western Ghats (Sri Lanka is included but it's a separate country)
• Indo-Burma hotspot includes northeast India (NOT south/central India)
• Sundaland = Andaman & Nicobar component in India (NOT the entire A&N archipelago)
• Project Tiger launched 1973; NTCA set up under WPA Amendment 2006

Key Terms

Project Cheetah

• Definition: Project Cheetah is India's programme to reintroduce the cheetah — the only large mammal to have gone extinct in independent India — by translocating African cheetahs from Namibia and South Africa to Kuno National Park in Madhya Pradesh, launched on 17 September 2022. It is recognised as the world's first inter-continental translocation of a large wild carnivore.
• Context: The Asiatic cheetah was declared extinct in India in 1952; the last individuals are believed to have been shot around 1948 by the Maharaja of Koriya (Surguja) region in present-day Chhattisgarh. Since the Asiatic subspecies survives only in critically endangered numbers in Iran (which declined to provide animals), India opted to reintroduce the closely related African cheetah. The first batch of eight cheetahs from Namibia was released by Prime Minister Narendra Modi at Kuno National Park on his birthday, 17 September 2022, followed by 12 from South Africa in February 2023.
• UPSC Relevance: Project Cheetah is a high-frequency current-affairs and environment topic that bridges GS3 (conservation, biodiversity, environmental management) and GS1 (physical/biogeography of grassland ecosystems). Prelims commonly tests factual recall — launch year, source countries, Kuno's location and the implementing body (National Tiger Conservation Authority under MoEFCC) — while Mains favours analytical framing on reintroduction ecology, habitat suitability, and the debate over translocating a non-native subspecies. This is a foundational conservation case study that underpins questions on the species-reintroduction, in-situ conservation and human-wildlife coexistence topic family; no verified standalone PYQ is cited here.

Wildlife Protection Schedules

• Definition: The Wildlife Protection Schedules are the appended lists in the Wild Life (Protection) Act, 1972 that classify species by the degree of legal protection and trade regulation they receive. Following the Wild Life (Protection) Amendment Act, 2022 (in force from 1 April 2023), the earlier six schedules were rationalised into four — Schedule I and II for animals, Schedule III for plants, and Schedule IV for species listed under CITES.
• Context: The Wild Life (Protection) Act, 1972 is India's principal statute for protecting wild fauna and flora and regulating hunting and trade. Originally the Act carried six schedules giving graded protection — Schedules I–IV for specially protected animals, Schedule V for "vermin" (species that could be legally hunted), and Schedule VI for protected plants. The Wild Life (Protection) Amendment Act, 2022 overhauled this structure to reduce the number of schedules, remove the vermin schedule, and add a dedicated schedule to implement India's obligations under CITES (Convention on International Trade in Endangered Species of Wild Fauna and Flora).
• UPSC Relevance: The schedules are a high-frequency Prelims fact area — UPSC repeatedly tests which schedule confers the highest protection and the recent shift from six schedules to four. It is a foundational concept that underpins questions on the Wildlife Protection Act, CITES, protected areas, and conservation of specific species. For Mains GS3 (environment/biodiversity), the 2022 rationalisation, the removal of the vermin schedule, and CITES alignment are useful for analysing the strengthening or weakening of India's wildlife governance. Aspirants should not confuse the post-2022 four-schedule structure with the pre-2022 six-schedule structure, as both still appear in older study material.

Coral Bleaching

• Definition: Coral bleaching is the whitening of corals that occurs when stressed corals expel the symbiotic algae (zooxanthellae) living in their tissues; since these algae supply most of the coral's food and colour, their loss leaves the coral pale and starving, though not immediately dead.
• Context: Reef-building corals live in a mutualistic relationship with microscopic zooxanthellae algae, which provide up to ~90% of the coral's nutrition through photosynthesis. When sea surface temperatures rise even 1-2 degC above the long-term summer maximum for a sustained period, the algae's photosynthesis malfunctions and produces toxic reactive oxygen species, prompting the coral to expel them. NOAA confirmed the world's fourth global coral bleaching event in April 2024; from January 2023 to mid-2025 it affected about 84% of the world's reef area across the Pacific, Atlantic and Indian Oceans before likely ending in 2025 — the most extensive on record.
• UPSC Relevance: Coral bleaching is a high-frequency GS3 environment-and-ecology theme and a recurring Prelims favourite, testing the coral-zooxanthellae symbiosis, the role of rising sea surface temperature, and the location of India's four major reef areas (Gulf of Mannar, Gulf of Kachchh, Andaman and Nicobar, Lakshadweep). It is a foundational concept that underpins questions on marine biodiversity loss, climate change impacts, ocean warming and El Nino. In Mains it links to the climate-change mitigation debate, the Blue Economy and conservation governance, making it useful for both factual recall and analytical answers.

Invasive Alien Species

• Definition: Invasive Alien Species (IAS) are non-native plants, animals or other organisms introduced — accidentally or deliberately — outside their natural range, whose establishment and spread cause harm to native biodiversity, ecosystems, the economy or human health.
• Context: Not every alien (non-native) species becomes invasive; only those that establish, spread aggressively and cause damage qualify as "invasive." IAS are recognised internationally as one of the leading direct drivers of global biodiversity loss, alongside land/sea-use change, climate change, pollution and overexploitation. The landmark IPBES Thematic Assessment on Invasive Alien Species (approved September 2023) provided the first comprehensive global synthesis of their scale, cost and management. India hosts widely studied invaders such as Lantana camara, Parthenium (congress grass) and water hyacinth.
• UPSC Relevance: This is a high-yield GS3 environment-and-ecology theme that also touches GS2 (international conventions). Prelims commonly tests factual recall — the IPBES/CBD distinction between "alien" and "invasive," which bodies released which report, and identification of specific invaders (Lantana, Parthenium, water hyacinth). Mains expects candidates to link IAS to biodiversity loss, ecosystem services, climate interactions and India's regulatory response under the Wild Life (Protection) Amendment Act, 2022 (Section 62A) and global Target 6 of the Kunming-Montreal Framework. Foundational concept — underpins questions on biodiversity loss, conservation governance and the Convention on Biological Diversity.

Conservation Reserves and Community Reserves

• Definition: Conservation Reserves and Community Reserves are two categories of protected areas introduced by the Wild Life (Protection) Amendment Act, 2002 (Sections 36A–36D), enabling protection of land adjoining national parks/sanctuaries and on private or community-owned land respectively, through participatory, community-involved conservation.
• Context: Until 2002, India's protected-area framework recognised only National Parks and Wildlife Sanctuaries, both involving strict state control and frequent restriction of local rights. The Wild Life (Protection) Amendment Act, 2002 (effective 2003) added Conservation Reserves (Section 36A) and Community Reserves (Section 36C) to extend protection to buffer and corridor lands and to private/community holdings, while keeping local communities as partners rather than excluded parties. These categories operationalise India's commitment to participatory, decentralised conservation and align with the IUCN's recognition of community-conserved areas.
• UPSC Relevance: This is a foundational Environment/GS3 concept that underpins recurring Prelims questions on India's protected-area categories and the distinguishing features of each (ownership, who may declare, effect on local rights). In Prelims, the most testable points are the governing sections (36A vs 36C), the land-ownership distinction (government land for Conservation Reserves; private/community land for Community Reserves), and management committees. For Mains GS3, it links to biodiversity conservation, the role of communities in protected-area governance, and corridor/buffer connectivity. No verified PYQ cites this exact term, so prepare it as part of the broader "protected areas of India" topic family.

Wildlife Corridors

• Definition: Wildlife corridors are strips or patches of habitat that connect otherwise isolated, fragmented landscapes or protected areas, enabling animals to move safely between them for foraging, dispersal, breeding and seasonal migration. In India they are not a stand-alone legal protected-area category but are recognised functionally through instruments such as Tiger Conservation Plans and Conservation/Community Reserves.
• Context: Habitat fragmentation caused by roads, railways, canals, mines, plantations and settlements increasingly isolates wildlife populations, raising the risk of inbreeding, local extinction and human-wildlife conflict. Corridors maintain "connectivity" so that gene flow and animal movement persist across a wider landscape. India's National Wildlife Action Plan (2017-2031) explicitly links aggravated human-wildlife conflict to fragmentation and prioritises securing corridors. Tiger and elephant corridors are the most mapped, by the NTCA-Wildlife Institute of India and Project Elephant respectively.
• UPSC Relevance: This is a foundational environment and ecology concept that underpins UPSC questions on protected-area categories, the Wildlife (Protection) Act 1972, Project Tiger, Project Elephant, habitat fragmentation and human-wildlife conflict. For Prelims, aspirants should be clear that corridors are not a notified category like national parks or sanctuaries, but that Conservation Reserves and Community Reserves (added by the 2002 amendment) often serve as connectors. For Mains GS3, corridors feature in answers on biodiversity conservation, balancing infrastructure (linear projects) with ecology, and reducing human-wildlife conflict.

Vocabulary

Wanton

• Pronunciation: /ˈwɒntən/
• Definition: (Of a harmful act) deliberate, unprovoked and without any reasonable justification; marked by reckless or malicious disregard for what is right, just or for the consequences to others.
• Root: Middle English wan- = lacking, badly (privative prefix) + togen (p.p. of OE teon = to train); lit. 'untrained'
• Origin: From Middle English "wantowen/wantoun" (undisciplined, unruly), from "wan-" (a privative prefix meaning "lacking, badly, un-") + "togen", past participle of Old English "teon" (to train, discipline) — literally "untrained, ill-bred". The sense "inhumane, merciless" is recorded from the 1510s.
• Part of Speech: adjective; also noun and verb (intransitive)
• Word Family: wanton (n/adj/v), wantonly (adv), wantonness (n), wantoned (v past)
• Usage: The colonial administration's wanton extraction of forest and mineral wealth, pursued without thought for ecological balance or tribal livelihoods, left a scar on India's environmental commons that post-independence conservation policy is still struggling to heal.
• Synonyms: gratuitous, unprovoked, malicious, reckless, unrestrained, senseless
• Antonyms: justified, restrained, deliberate (well-considered), disciplined
• Mnemonic: Read it as "WANT-on" — a wanton act springs from raw "want" let loose, with the "-on" switch jammed on: desire and destruction running unchecked, lacking (wan-) all discipline.