Course review

3.2 Human impact on biodiversity

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Learning objective

3.2.1—Threats to biodiversity

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• Direct: overharvesting, poaching, illegal pet trade • Indirect: habitat loss, climate change, pollution, invasive alien species

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Learning objective

3.2.2—Multiple human impacts

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• Most ecosystems subject to multiple impacts • Effects amplified when combined

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Learning objective

3.2.3—Invasive alien species

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• Reduce biodiversity through competition, predation, diseases/parasites

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Learning objective

3.2.4—IUCN Red List

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• Global conservation status assessment • Based on: population numbers, rate changes, breeding potential, geographic range, threats • Status ranks: least concern (LC) to extinct (EX)

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Learning objective

3.2.5—Conservation status benefits

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• Publicizes species vulnerability • Allows selection of conservation priorities and management strategies

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Learning objective

3.2.6—Species case studies

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• Extinct species due to human activity • Critically endangered species • Species improved by intervention

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Learning objective

3.2.7—Tragedy of the commons

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• Overexploitation of shared natural resources • Tension between individual self-interest and sustainable development • Examples: fish stocks, ocean plastic pollution

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