Why conserve biodiversity?

• Arguments for preservation can be aesthetic, ecological, economic, ethical and social.

• Aesthetic: species and landscapes have beauty, cultural value and recreational value.

• Ecological: biodiversity supports ecosystem stability, resilience, food webs, nutrient cycling and ecosystem services.

• Economic: biodiversity provides ecotourism income, genetic resources, medicines, food, raw materials and other forms of natural capital.

• Ethical: species may have intrinsic value (worth in themselves), not just value to humans.

• Social: habitats and species support human well-being, livelihoods, identity and community use of goods and services.

• In essays, link the chosen justification directly to why conservation should happen and who benefits.

In situ, ex situ and mixed conservation strategies

• Species-based conservation usually uses ex situ methods = conservation outside the natural habitat.

• Habitat-based conservation usually uses in situ methods = conservation within the natural habitat.

• Ex situ examples: zoos, botanic gardens, seed banks, captive breeding, gene banks, CITES.

• In situ examples: national parks, nature reserves, sanctuaries, marine protected areas, habitat restoration.

• CITES = Convention on International Trade in Endangered Species of Wild Fauna and Flora; reduces biodiversity loss by controlling trade in endangered species.

• Mixed conservation approach = protects a species and its habitat together.

• Mixed approaches often use flagship species or keystone species to justify wider habitat protection.

• Good named example: Chengdu Research Base of Giant Panda Breeding — species-focused work linked to wider habitat conservation.

• Exam tip: compare strategies by discussing advantages, limitations, cost, scale, genetic diversity, reintroduction potential and long-term sustainability.

International frameworks and habitat protection

• CBD = Convention on Biological Diversity.

• Main aims of the CBD: conservation of biodiversity, sustainable use of biological resources, and fair/equitable sharing of benefits from genetic resources.

• The Nagoya Protocol supports fair and equitable sharing of genetic resources.

• Habitat conservation may require:

  • Protection of wild areas

  • Active management of habitats

  • Control of invasive species

  • Pest exclusion

  • Restoration of degraded areas

• An ecosanctuary is a protected area that may use pest-exclusion fencing to protect vulnerable native species.

• Effective reserve design depends on understanding the biology of target species.

• Important design factors:

  • Size of reserve

  • Shape of reserve

  • Edge effects

  • Wildlife corridors / connectivity

• Edge effects = changes at habitat boundaries (for example, more light, wind, predators, invasive species, human disturbance).

• Wildlife corridors improve movement, gene flow and connectivity between fragmented habitats.

• UNESCO biosphere reserves are a key model:

  • Core zone = strictly protected, high conservation value

  • Buffer zone = research, education, low-impact use

  • Transition zone = sustainable human activity

• A strong answer links protected-area design to species survival, reduced fragmentation and lower risk of local extinction.

Regeneration and rewilding

• Regeneration = restoring ecosystem structure, processes and biodiversity after degradation.

• Rewilding = allowing natural processes to recover, often with less direct human control.

• Rewilding methods may include:

  • Reintroducing apex predators or other keystone species

  • Reconnecting fragmented habitats to improve connectivity

  • Ending or reducing agriculture, grazing or resource harvesting

  • Minimizing direct human interference

• Rewilding can restore food webs, trophic interactions, succession and ecosystem equilibrium.

• Reintroducing keystone species can trigger positive feedback loops that increase biodiversity.

• Example chain: predator returns → herbivore pressure falls/changes → vegetation recovers → habitats for more species increase → biodiversity rises.

• Rewilding helps move systems away from tipping points and back toward a stable equilibrium.

• Good named projects to revise: Knepp Estate (England), Affric Highlands (Scotland), Gorongosa National Park (Mozambique), Hinewai Reserve (New Zealand).

• Common benefits of rewilding:

  • More biodiversity

  • Greater resilience

  • Recovery of ecosystem processes

  • Carbon storage and improved ecosystem services

  • Potential ecotourism benefits

• Common limitations:

  • Land-use conflict with food production

  • High initial cost or long recovery time

  • Public resistance to predator return

  • Need for local community support

  • Results may be variable and slow

This trophic cascade diagram shows why rewilding can work: restoring a top predator can reduce overgrazing and allow vegetation to recover. It helps explain how reintroducing a keystone species can regenerate wider ecosystem structure and biodiversity. Source

How worldviews affect conservation choices

• Environmental perspectives and value systems influence which strategies a society prefers.

• More ecocentric perspectives often favour low-intervention in situ conservation because biodiversity is valued for its intrinsic value.

• More anthropocentric or technocentric perspectives often support managed interventions such as zoos, gene banks, captive breeding, ecotourism and technological monitoring.

• Successful conservation usually needs a mix of approaches rather than one single worldview.

• Strong conservation outcomes depend on:

  • Community support

  • Adequate funding

  • Education and awareness

  • Appropriate legislation

  • Scientific research

  • Attention to environmental justice

• Always consider who gains, who loses, and whether local or indigenous communities were included in decisions.

Assessing success of conservation and regeneration

• Success must be evaluated, not just assumed.

• ESS requires success to be judged at three levels:

  • Did the project achieve its planned aims?

  • Was it accepted by affected communities?

  • Was it the best way to conserve nature?

• Useful evidence of success may include:

  • Increased population size of target species

  • Improved species diversity or habitat quality

  • Better connectivity

  • Reduced threat levels

  • Positive effects on local livelihoods

• Be ready to discuss one named example such as Wangari Maathai’s Green Belt Movement, FORRU-CMU forest restoration, or Willie Smits’ rainforest restoration.

• Strong exam answers balance ecological outcomes with social impacts.

Ecotourism

• Ecotourism can support conservation by generating income and funding protected areas.

• It can increase interdependence between local communities and biodiversity protection.

• Possible benefits:

  • jobs and income

  • stronger incentive to protect habitats/species

  • funding for rangers, restoration and education

• Possible negative impacts:

  • habitat disturbance

  • waste, transport emissions and infrastructure pressure

  • unequal sharing of profits

  • cultural disruption

• In evaluation questions, weigh economic benefits against ecological and social costs.

This image set supports ex situ conservation by showing how seed banking protects genetic diversity for rare plant species. It is useful for explaining why seed banks act as an “insurance policy” and can support future restoration and reintroduction. Source