Question
Differentiate between in situ and ex situ conservation with examples. What are the advantages and limitations of each approach? How do national parks differ from wildlife sanctuaries?
(NEET + CBSE Board — comparison + examples)
Solution — Step by Step
| Feature | In Situ Conservation | Ex Situ Conservation |
|---|---|---|
| Meaning | Conservation in natural habitat | Conservation outside natural habitat |
| Examples | National parks, wildlife sanctuaries, biosphere reserves, sacred groves | Zoos, botanical gardens, seed banks, cryopreservation |
| Advantage | Preserves entire ecosystem, natural behaviour maintained | Can save species on brink of extinction, controlled breeding |
| Limitation | Large area needed, human-wildlife conflict | Expensive, artificial environment, limited population |
| Approach | Protect the habitat → species survive | Protect the species → reintroduce later |
| Feature | National Park | Wildlife Sanctuary |
|---|---|---|
| Human activity | Strictly prohibited — no grazing, forestry, or private ownership | Limited human activities permitted (grazing sometimes allowed) |
| Boundary | Well-defined, legislated boundaries | Boundaries may not be fixed by legislation |
| Purpose | Conservation of entire ecosystem | Primarily for conservation of specific fauna |
| Examples | Jim Corbett (Uttarakhand), Kaziranga (Assam), Bandipur (Karnataka) | Bharatpur Bird Sanctuary (Rajasthan), Periyar (Kerala) |
| Established by | Central/State government notification | State government notification |
Biosphere reserves are large areas with multiple zones:
- Core zone — no human activity (like a national park)
- Buffer zone — limited scientific research
- Transition zone — local communities can live and use resources sustainably
India has 18 biosphere reserves. Examples: Nilgiri, Nanda Devi, Sundarbans, Gulf of Mannar.
graph TD
A[Conservation Strategies] --> B["In Situ - In natural habitat"]
A --> C["Ex Situ - Outside habitat"]
B --> B1["National Parks"]
B --> B2["Wildlife Sanctuaries"]
B --> B3["Biosphere Reserves"]
B --> B4["Sacred Groves"]
C --> C1["Zoos"]
C --> C2["Botanical Gardens"]
C --> C3["Seed Banks"]
C --> C4["Cryopreservation"]
style A fill:#fbbf24,stroke:#000,stroke-width:2px
style B fill:#86efac,stroke:#000
style C fill:#93c5fd,stroke:#000Why This Works
In situ conservation is considered superior because it preserves not just the target species but the entire ecosystem — including the complex web of interactions between species, their habitats, and ecological processes. A tiger in a national park maintains its role as a top predator, controlling herbivore populations and shaping the forest.
Ex situ conservation is the safety net — when a species’ habitat is destroyed or the population is critically low, removing individuals to a controlled environment (zoo, breeding centre) may be the only option. The goal is always eventual reintroduction into the wild.
Common Mistake
Students frequently confuse national parks with wildlife sanctuaries. The key distinction: national parks have stricter protection — no human activities are permitted, boundaries are legally defined. In wildlife sanctuaries, limited human activities like grazing may be allowed. NEET tests this specific difference almost every year.
NEET often asks: “Which is an example of ex situ conservation?” The trap options include national parks and biosphere reserves (both in situ). Seed banks, zoos, and cryopreservation are all ex situ. Sacred groves are in situ — they are patches of forest protected by local communities for religious reasons.