Biology- Controlling the effects of human activities

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The Galapagos Islands

Human activities

  • Habitat disturbance- more waste and pollution (oil spill in 2001), building and conversion of land for agriculture has lead to fragmentation.
  • Over-expolitation of resources- Whaling boats and fur traders, a boom for exotic fishinghas depeleted populations.
  • Effects of introduced species- Alien species can eat native species, destoy their habitatas or bring disease. E.g cats, goats, red quinine.

Strategies used for conservation

  • Preventing the introduction
  • Increasing number of researchers and tourists.
  • Increased interest from fishing industry- Krill are used to make nutritional supplements in vast quantities but this makes it diffcult for natural predators to find them elsewhere.
  • Whaling.
  • Pollution, hunting and poaching- Albatrosses and petrels are threatend by egg poaching, habitat destruction and introdution of non-native predators.
  • Long-line fishing- birds try to eat their prey and swallow the hooks.

Strategies used for conservation

  • To avoid over-expolitation, there is a trigger level catch size in

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