Biology › Section S · Ecosystems and conservation › Topic S.5

Threats to biodiversity

Species are being lost far faster than the background rate, and the causes are well known: we clear habitats, harvest too hard, move species around the planet, pollute, and change the climate. Understanding how each threat works is the first step towards stopping it.

In this topic

  • The main threats
  • Habitat loss and fragmentation
  • The species-area relationship
  • Worked example: clearing a forest
  • Overharvesting
  • Invasive species
  • Introduced diseases
  • Pollution
  • Climate change
  • Worked example: squeezed off a mountain
  • Common mistakes to avoid
  • Key takeaways

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