Lecture 4 invasives

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Unformatted text preview: Invasive species   Lecture outline/goals: o  o  o  o  o  o  Some defini8ons What’s the big deal? Impacts of invasive species What makes a good invader? The 3 stages of invasion North American examples 1 Some defini8ons   An alien (non ­na8ve or introduced) species is an organism that occurs outside its natural range   An invasive species is an organism that is alien (non ­na8ve or introduced) to the ecosystem under considera8on and whose introduc8on causes, or is likely to cause, economic or environmental harm or harm to human health Who are the invaders?   Diverse taxa   Inten8onal introduc8ons o  For immigrants to “acclima8ze” •  •  •  •  Birds – e.g. European starling Plants – e.g. Scotch broom Mammals – e.g. grey squirrels Insects – e.g. Lady bird beetles   Accidental introduc8ons o  Many ecologically detrimental...
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  • Fall '13
  • Carroll
  • Pimentel, San Francisco Estuary, CFIA

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