IB Biology Topic A4.2.7 Need for Several Approaches to Conservation of Biodiversity Revision Notes (SL/HL)

IB Biology Topic A4.2.7 Need for Several Approaches to Conservation of Biodiversity Revision Notes (SL/HL) | RevisionDojo

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Multiple Approaches: Why No Single Strategy Can Save Biodiversity

Biodiversity faces many threats at once: habitat loss, overexploitation, pollution, invasive species, and climate change.
These pressures overlap and reinforce each other, so no single method can address them all.
Effective conservation therefore combines two broad categories:
1. In situ: protecting species within their natural habitat.
2. Ex situ: maintaining species outside their habitat as a safety net.

Analogy

Conservation is like treating a complex illness.
You may need surgery (habitat protection), medication (captive breeding), and lifestyle change (policy) all at once.
Relying on one approach rarely works when several systems are failing.

In Situ Conservation: Protecting Species Where They Live

In situ conservation protects species within their natural ecosystems.
The most common tool is the protected area, such as a national park or nature reserve.
Protected areas shield ecosystems from deforestation, poaching, and urban expansion.

Case study

Serengeti National Park in Tanzania protects a vast savanna and its annual wildebeest migration.
Wapusk National Park in Canada protects subarctic tundra and major polar bear denning grounds.

Protected areas need active management, such as removing invasive species, anti-poaching patrols, and controlled burns.
They still face threats they cannot wall out, like climate change and encroachment from nearby communities.

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IB Biology Topic A4.2.7: Need for Several Approaches to Conservation of Biodiversity Notes

Multiple Approaches: Why No Single Strategy Can Save Biodiversity

In Situ Conservation: Protecting Species Where They Live

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

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Multiple Approaches: Why No Single Strategy Can Save Biodiversity

In Situ Conservation: Protecting Species Where They Live

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

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A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic A4.2.7: Need for Several Approaches to Conservation of Biodiversity Notes

Multiple Approaches: Why No Single Strategy Can Save Biodiversity

In Situ Conservation: Protecting Species Where They Live

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

Multiple Approaches: Why No Single Strategy Can Save Biodiversity

In Situ Conservation: Protecting Species Where They Live

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics