sciene chap 4

• Introduced species in an ecosystem

  Species that are brought into an ecosystem from another location
• Before human arrival in New Zealand

  • No predatory mammals
  • Native species of birds nest on the ground- no predator to eat their eggs
• Invasive species


  Introduced species that grow and reproduce rapidly and aggressively, and can harm the ecological balance, biodiversity, or even human health
• Introduced species in New Zealand

  • Polynesians
  • Europeans
  • Rats
  • Rabbits
  • Stoats
• Ways invasive species can affect an ecosystem

  • Causing extinctions of native plants and animals
  • Reducing biodiversity
  • Competing with native organisms for limited resources
  • Altering habitats
• After first human arrival in New Zealand


  • Brought some species of animals not belong to New Zealand
  • Egg-Rats: eat birds
  • Rabbit-eat grass
  • Stoats-controlled to reduce their number