Biodiversity and Conservation · Lesson 9 of 10
Conservation Approaches and Global Action
“Compare in situ and ex situ conservation, hotspots, protected areas and international commitments.”
• Distinguish in situ from ex situ conservation and their applications. • Apply the modern criteria used to define biodiversity hotspots. • Explain the functions of parks, sacred groves and connected habitats. • Describe seed banks, cryopreservation, tissue culture and managed breeding. • Connect historical conservation agreements with present international targets.
In situ and ex situ conservation solve different problems
In situ conservation protects organisms within their natural ecosystems. It aims to maintain habitats, ecological interactions and evolutionary processes rather than isolate a few individual species. Protecting a forest can preserve not only a threatened tiger but prey populations, plants, decomposers and the environmental conditions sustaining the food web. National parks, wildlife sanctuaries, community-protected areas and habitat corridors are examples of measures contributing to this approach.
Ex situ conservation maintains organisms or their reproductive material outside the natural habitat, such as in botanical gardens, zoological facilities, seed banks or cryogenic collections. It can be especially useful when wild populations are extremely small or their habitats face immediate danger. Its limitation is that a stored seed or captive animal does not, by itself, restore the ecological relationships that existed in the wild.
Both approaches are often needed. A rare plant may require protected natural habitat, removal of invasive competitors, and backup seeds in a gene bank. Success is better measured by persistence of viable populations and functional ecosystems than by the number of organisms held in captivity.
Biodiversity hotspots: richness, uniqueness and threat
Conservation budgets are limited while species and ecosystems face many threats. The biodiversity hotspot concept identifies regions combining substantial endemism with severe destruction of original natural vegetation. Endemic species occur naturally in a restricted geographical region; their loss from that region could mean global extinction if they occur nowhere else.
Under the widely used modern definition, a hotspot must contain at least 1,500 endemic vascular plant species and have lost at least 70% of its original native vegetation. Both criteria matter. A species-rich region with little habitat loss may be ecologically valuable but does not automatically satisfy this particular hotspot designation, and a badly degraded site lacking the required endemism also may not qualify.
The source lists 34 hotspots and identifies three covering parts of India under an older classification. Current Conservation International guidance recognises 36 hotspots. Four extend into Indian territory: Himalaya, Indo-Burma, Western Ghats and Sri Lanka, and Sundaland (including the Nicobar Islands). This is a change in the recognised list and geographical coverage, not evidence that India's habitats suddenly became more diverse overnight.
Hotspot priorities are useful but not the only basis for conserving nature. A wetland outside a designated hotspot may still protect rare migratory birds, carbon stores or unique freshwater ecological processes. Endemism and threat guide resource allocation without cancelling the value of other ecosystems.
Protected areas and community conservation
National parks and wildlife sanctuaries protect important habitats and species through legal management regimes. Their exact permitted uses and restrictions depend on national legislation and site designation, so the names should not be treated as globally uniform legal categories. Biosphere reserves can combine core conservation zones with surrounding areas designed for compatible research, education and sustainable use.
The source lists historical counts of Indian biosphere reserves, national parks and sanctuaries; these are not suitable as present-day totals. The Wildlife Institute of India reported 106 national parks and 574 wildlife sanctuaries in its August 2025 category pages. Counts depend on dates and categories, so conservation lessons should focus primarily on their ecological purpose rather than imply a fixed number.
Sacred groves are patches of forest or other natural vegetation preserved through longstanding cultural and community traditions. The source names groves in the Khasi and Jaintia Hills of Meghalaya, parts of the Aravalli region, Western Ghats and central Indian regions. Such places can retain old trees, rare plants, pollinators and small habitat refuges even where surrounding landscapes are heavily modified.
Traditional or community-based conservation can work alongside formal protections. Respect for local rights, practical stewardship and appropriate ecological management often matters for long-term success. A protected boundary on a map alone cannot eliminate poaching, invasive species, habitat fragmentation or all pressures originating outside the boundary.
Ex situ tools: seeds, cells and captive populations
Seed banks store seeds under conditions intended to preserve viability for future germination. Suitable low moisture and temperature slow seed deterioration for many species, though not every plant produces seeds that tolerate drying and cold storage. Collections of many genetic lines help preserve useful variation, including traits relevant to crop breeding or restoration.
Cryopreservation keeps biological material at very low temperature so that metabolism and deterioration are greatly reduced. Depending on the organism and protocol, researchers may preserve sperm, eggs, embryos or tissues. In vitro fertilisation can sometimes support reproduction where natural mating is difficult, while plant tissue culture can propagate individuals from small pieces of suitable tissue under controlled sterile conditions.
Captive breeding and botanical collections provide opportunities for study, education and genetic management. They also face risks: limited founder populations, inbreeding, adaptation to captivity and loss of natural behaviours can complicate successful reintroduction. Ex situ measures are most effective when tied to habitat protection and a realistic recovery plan.
Conservation across borders and generations
Species migrate across national boundaries, rivers flow between jurisdictions and biodiversity losses can affect entire regions. The 1992 Convention on Biological Diversity emerged from the Rio Earth Summit and established international objectives for conserving biodiversity, using its components sustainably and sharing benefits from genetic resources fairly. The 2002 Johannesburg summit reaffirmed the urgency of reducing biodiversity loss; the source describes its historical 2010 reduction commitment.
International goals have since evolved. The Kunming–Montreal Global Biodiversity Framework adopted in 2022 includes a 2030 target to effectively conserve and manage at least 30% of terrestrial and inland water areas and at least 30% of coastal and marine areas, with attention to ecological representation, connectivity and equitable governance. It also calls for restoration of at least 30% of degraded ecosystems. These are international targets, not claims that they have already been achieved.
Successful conservation should address biodiversity, the rights and knowledge of Indigenous peoples and local communities, sustainable resource use, and monitoring of real ecological outcomes. Protecting species within functional landscapes is a long-term process, not a single ceremonial declaration.
Quick Quiz
Quiz
Which action is the clearest example of in situ conservation?
Which pair meets the standard biodiversity hotspot criteria?
Which ex situ method specifically stores plant genetic material for future germination?
What is the ecological role of sacred groves?
Which statement accurately describes the biodiversity framework's 2030 conservation target?
Which item is an important limitation of captive breeding?
Practice Problems
- Compare in situ and ex situ conservation in terms of what is protected, ecological strengths and limitations.
- Explain the two biodiversity hotspot criteria and name the four hotspots overlapping Indian territory.
- Explain how sacred groves can maintain biodiversity outside large formally protected reserves.
- Compare seed banking, cryopreservation, tissue culture and in vitro fertilisation, including a limitation of each.
- Interpret the ecological and ethical meaning of the 2030 area-conservation target.
- A rare orchid survives in one fragmented forest and a botanical garden. Propose a conservation programme using both approaches.
In situ conservation protects organisms within their natural habitats, maintaining interactions, selection pressures and ecological processes; it may be threatened by land-use conflicts or ongoing habitat damage. Ex situ conservation preserves individuals or reproductive material outside native habitat, such as seeds, cultured tissues or captive populations; it can prevent immediate loss but often cannot sustain whole food webs or natural behaviour. Many recovery plans need both approaches.
Key Takeaways
• In situ conservation maintains organisms and ecological interactions in natural habitats. • Ex situ conservation safeguards organisms or genetic material outside the natural habitat. • Hotspot status requires high vascular-plant endemism and severe habitat loss; 36 hotspots are currently recognised. • Four recognised hotspots extend into Indian territory, including Sundaland in the Nicobar Islands. • Protected areas and sacred groves can complement community-led stewardship. • Seed banks, cryopreservation, tissue culture and managed breeding have distinct uses and limitations. • International commitments link conservation, sustainable use and equitable benefit sharing. • Area-based targets require effective management, connectivity and fair governance, not boundaries alone.