34 - 11/16/10 Next topic: Invasive species (will cover in...

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11/16/10 1 Next topic: Invasive species (will cover in Lecture 34, after finishing section on habitat fragmentation) What should we call them? Invasive species? Introduced species? Non-native species? Alien species? Exotic species? Nonindigenous species? Biological invaders? Aliens? Exotics? Invaders? Recently arrived species? Invasive species as a threat to biodiversity • Decreases in habitat quality are frequently the consequence of introduced predators, competitors, or disease organisms: – many species arrive accidentally and others are introduced intentionally – islands seem to be most vulnerable to introduced species (Hawaiian Islands have suffered greatly from introduced species) – aquatic systems are also vulnerable to effects of exotics – continental areas are not immune to effects of exotics Don’t invasions happen naturally? • Yes, BUT. .. • _______________________________ MUCH higher than ever before, because of global commerce Non-natives continue to arrive Contaminants of crops (many rangeland weeds)
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34 - 11/16/10 Next topic: Invasive species (will cover in...

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