Effective Strategies for Biodiversity Conservation: In-situ and Ex-situ Approaches

Every grain of rice on a plate, every variety of mango in a market, and every life-saving medicine derived from a plant traces back to the rich web of living organisms that share this planet. Yet this web is unravelling faster than at almost any point in human history. Habitat loss, pollution, overexploitation, and climate change are pushing thousands of species toward extinction. Protecting what remains is not just an ethical responsibility but a practical necessity, and conservationists rely on two broad and complementary approaches to do it: protecting species where they naturally live, and safeguarding them in carefully managed facilities elsewhere. Understanding how these two strategies work, and why both are needed, is central to any serious effort to halt biodiversity loss.

Why conservation is essential 🔗

Biodiversity is the variety of all life forms on Earth, spanning the diversity of genes within a species, the range of species within ecosystems, and the variety of ecosystems themselves. This diversity is not a luxury. It is the foundation of human survival, supplying food, fibre, medicine, clean water, and stable climates.

Genetic resources and food security 🔗

The case for conservation becomes most urgent when it comes to wild genetic resources. Crop wild relatives are the wild cousins of cultivated plants, and they carry genes for traits such as drought tolerance, pest resistance, and disease resistance that domesticated crops often lack. When a new disease threatens wheat or rice, breeders frequently turn to these wild populations to find resistant genes. The wise conservation and use of crop wild relatives are therefore essential for increasing food security, eliminating poverty, and maintaining the environment.

The danger is that these wild populations are vanishing. Deforestation is wiping out wild relatives of fruit, nut, and industrial crops, while overgrazing and desertification are shrinking populations of cereal crop relatives in arid regions. Once a wild population disappears, the unique genes it carried are lost forever, narrowing the genetic base available for future agriculture. This is why securing genetic diversity is treated as a matter of national food and nutritional security rather than a purely environmental concern.

Ecosystem health and economic value 🔗

Beyond agriculture, biodiversity underpins the ecosystem services that economies quietly depend on. Pollinators support crop yields, forests regulate water cycles and store carbon, and wetlands filter pollutants. Protected forests and marine areas sequester large volumes of carbon dioxide, helping to stabilise the climate, and they protect the headwaters of major rivers that supply freshwater to downstream agriculture and cities. Medicinal plants have contributed to countless modern drugs, and many potential treatments likely remain undiscovered in habitats that are disappearing before they can be studied. Losing biodiversity, in short, means losing options that cannot be recreated.

In-situ conservation 🔗

In-situ conservation means protecting species within their natural habitats, on site, where evolutionary and ecological processes can continue undisturbed. It is the on-site conservation of genetic resources in natural populations of plant and animal species. The advantage is comprehensive: instead of saving individual species, in-situ methods preserve entire ecosystems, allowing species to keep adapting to environmental change and maintaining the natural food webs and interactions that sustain them.

Protected areas 🔗

The most visible form of in-situ conservation is the network of legally protected areas. Ecologically unique and biodiversity-rich regions are protected as biosphere reserves, national parks, wildlife sanctuaries, conservation reserves, and community reserves. The legal backbone for this network is the Wild Life (Protection) Act, 1972, which provides for the establishment of these protected areas. National parks offer the strictest protection, prohibiting the extraction of timber and other forest produce, while sanctuaries allow limited use under regulated conditions. The Ministry of Environment, Forest and Climate Change also funds the conservation of high-value biodiversity areas and wildlife corridors that lie outside the formal protected-area network.

Biosphere reserves 🔗

Biosphere reserves deserve special mention because they integrate conservation with sustainable human activity. Recognised under UNESCO’s Man and the Biosphere Programme, they are organised into zones: a strictly protected core area where human interference is restricted and natural processes dominate, surrounded by buffer and transition zones where sustainable settlement, cropping, and tourism are permitted. The Nilgiri Biosphere Reserve, established in 1986 across the Western Ghats of Tamil Nadu, Karnataka, and Kerala, was the first of its kind in the country and remains a model for balancing the needs of local and tribal communities with biodiversity protection. Several of these reserves are now part of UNESCO’s global network.

In-situ conservation is also relatively cost-effective. Maintaining a natural habitat keeps countless species protected simultaneously, without the high recurring expense of managing each species individually in captivity. It also acts as a living reservoir: a protected population of wild animals and plants can serve as a source for reintroducing species into surrounding areas if they decline there.

Community participation 🔗

In-situ conservation works best when local communities are partners rather than bystanders. Programmes such as Joint Forest Management involve villagers in protecting and regenerating forests, recognising that people who depend on a forest have the strongest incentive to keep it healthy. Community and conservation reserves represent a decentralised, community-led model of protection. This approach also draws on India’s deep tradition of grassroots environmentalism, exemplified by the Chipko movement of the 1970s, in which villagers in the Garhwal Himalayas hugged trees to prevent them from being felled.

Ex-situ conservation 🔗

Ex-situ conservation refers to protecting elements of biodiversity off-site, away from their natural habitats, in facilities designed to preserve them. This includes botanical gardens, zoological parks, gene banks, seed banks, and tissue culture laboratories. Where in-situ conservation protects whole ecosystems, ex-situ conservation focuses on saving species and their genetic material, and it becomes indispensable when natural habitats are too degraded to support a species or when a population has fallen dangerously low.

Gene banks and seed banks 🔗

The cornerstone of ex-situ conservation for plants is the gene bank, where seeds and other genetic material are stored under controlled conditions for the long term. India set up its first National Gene Bank in 1996, operated by the ICAR-National Bureau of Plant Genetic Resources (NBPGR) in New Delhi. The NBPGR is the nodal institution for the management of plant genetic resources, working through its headquarters and a network of regional stations across different agro-climatic zones. According to the NBPGR’s germplasm conservation division, the seed gene bank holds more than 460,000 accessions belonging to over 1,800 species, making it one of the largest gene banks in the world.

The National Gene Bank maintains several types of storage to suit different needs: a seed gene bank held at around minus 18 degrees Celsius for long-term storage, a cryogenebank using liquid nitrogen at extremely low temperatures, an in-vitro gene bank for species whose seeds cannot be dried and frozen, and a field gene bank for living plants. Recognising the continuing importance of this work for food security, the government announced a second National Gene Bank in the 2025-26 Union Budget, designed to hold a million germplasm lines for future food and nutritional security.

Cryopreservation and tissue culture 🔗

Modern ex-situ conservation has moved well beyond simply storing seeds. Gametes of threatened species can now be preserved in viable and fertile condition for long periods using cryopreservation, which freezes biological material at very low temperatures. Eggs can be fertilised in vitro, and plants can be propagated through tissue culture, in which new plants are grown from small samples of tissue in the laboratory. These techniques are particularly valuable for species that do not produce storable seeds and for rebuilding populations of critically endangered organisms.

Botanical gardens and zoos 🔗

Botanical gardens and zoological parks are the most familiar forms of ex-situ conservation. In a botanical garden, plants are grown and bred in a protected setting away from their natural home, often for research and public education. Zoos maintain breeding populations of threatened animals and increasingly run scientific programmes aimed at eventually reintroducing species into the wild. These facilities act as insurance against extinction and as reservoirs of genetic diversity that can supply individuals for reintroduction, complementing rather than replacing in-situ efforts.

India’s conservation efforts 🔗

India is one of the world’s megadiverse countries, and its conservation strategy combines legal protection, institutional capacity, and international commitment. As a signatory to the Convention on Biological Diversity and to CITES, the country has built a framework that spans both in-situ and ex-situ methods. The protected-area network covers national parks, wildlife sanctuaries, conservation reserves, and community reserves, supported by the National Board for Wildlife, which is chaired by the Prime Minister and sets the policy direction for wildlife conservation. Recovery programmes target critically endangered species, while gene banks and research institutions safeguard agricultural genetic diversity.

The legacy of Dr M.S. Swaminathan 🔗

No account of India’s conservation efforts is complete without Dr M.S. Swaminathan, the plant geneticist widely regarded as the architect of the country’s agricultural transformation. Although best known as a leader of the Green Revolution, Swaminathan was deeply concerned about the environmental costs of intensive farming and proposed an “evergreen revolution” that sought to balance agricultural productivity with ecological harmony through organic farming, soil and water conservation, and eco-friendly biotechnology.

His institutional contributions to conservation were profound. As Director-General of the Indian Council of Agricultural Research between 1972 and 1979, he established the National Bureaus of Plant, Animal, and Fish Genetic Resources and launched expeditions to collect wild rice species from biodiversity hotspots, gathering over 7,000 rice strains from north-eastern India as a valuable source of rare genes. On the global stage, as President of the IUCN from 1984 to 1990, he helped develop the draft of the Convention on Biological Diversity, and he later championed the concept of Farmers’ Rights, which recognises farming communities as custodians of plant genetic resources.

Through the M.S. Swaminathan Research Foundation, he advanced on-farm and in-situ conservation of plant genetic resources in agrobiodiversity hotspots, establishing Community Agrobiodiversity Centres and helping shape the legislation that led to India’s National Biodiversity Authority. His insistence on community participation, economic incentives, and the rights of tribal and rural families reframed conservation as something inseparable from human welfare and livelihoods.

Integrating both approaches 🔗

The clearest lesson from these efforts is that in-situ and ex-situ conservation are not rivals but partners. Protected areas keep ecosystems and evolutionary processes intact, while gene banks and breeding programmes act as a safety net when wild populations fail. A seed stored in a gene bank means little if there is no habitat left to reintroduce it into, and a protected forest is more secure when its genetic diversity is also backed up off-site. Effective conservation requires coordinated action at local, national, and international levels, bringing together governments, scientists, and communities in a shared commitment to protecting the living systems on which food security, health, and a stable climate ultimately depend.

What do you think? If you had to advise policymakers on where to direct limited conservation funding, would you prioritise expanding protected habitats or strengthening gene banks and breeding facilities? And how might everyday choices about the food we buy and the diversity of crops we support contribute to conserving the genetic resources that future food security depends on?

References

1. https://en.wikipedia.org/wiki/Crop_wild_relative
2. https://en.wikipedia.org/wiki/Wild_Life_(Protection)_Act,_1972
3. https://moef.gov.in/en/division/forest-divisions-2/wildlife-2/introduction/
4. https://www.pmfias.com/biodiversity-conservation/
5. https://nbpgr.org.in/nbpgr2023/at-a-glance/
6. https://nbpgr.org.in/nbpgr2023/germplasm-conservation-division-new-delhi/
7. https://www.downtoearth.org.in/governance/indias-new-national-gene-bank-is-vital-for-safeguarding-food-security-but-challenges-in-community-seed-bank-integration-remain
8. https://www.clearias.com/biodiversity-protection-steps-taken-by-indian-government/
9. https://www.britannica.com/biography/M-S-Swaminathan
10. https://ras.org.in/index.php?Article=biodiversity_conservation
11. https://www.mssrf.org/content/key-achievements