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Invasive Species
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Invasive Species


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  • 1. Invasive Species
  • 2. Non-Native Species
    • Can you name a species that lives in Ontario but is not native to Ontario?
    • Do you think that species has an impact on the natural environment?
    • How and why did the species get here?
  • 3. Non-Native Species
    • The introduction of non-native or exotic species to an ecosystem by humans is a major cause of species loss .
  • 4. Non-Native Species
    • Introductions of non-native species usually fail because so few species can tolerate an entirely new environment .
  • 5. Non-Native Species
    • Remember that for a species to survive it must be within its tolerance range for all abiotic factors.
  • 6. Non-Native Species
    • Even if a species is adapted to the abiotic environment, it may have difficulty finding food or may be unable to compete with native species .
  • 7.
    • Occasionally, an introduced species is successful in its new environment…
    zebra mussels
  • 8.
    • The new ecosystem may lack population controls for the new species, such as predators and diseases. Native species may not be able to compete with the introduced species.
  • 9.
    • When a population is unchecked , it gains an advantage over native species. It can increase rapidly and become invasive .
  • 10.
    • Invasive species are introduced species with growing populations that spread and have a negative effect on their environment.
  • 11. Non-Native Species
    • There are well over 3000 invasive species in Canada. In the Great Lakes, there are over 185 invasive species.
  • 12. European Earwig
  • 13. European Starling
  • 14. Carp
  • 15. Non-Native Species
    • Invasive species have significant environmental and economic impacts.
    • These species change natural ecosystems and cost Canadians billions of dollars annually just to control their population size .
  • 16.
    • It is impossible to predict which introduced species will become invasive .
    • Preventing the accidental introduction of a non-native species is ideal but difficult.
  • 17.
    • Insects can arrive as adults , larvae , or eggs in imported foods and containers from around the world.
    fruit infested with citrus codling moth
  • 18.  
  • 19.
    • Small seeds are equally difficult to detect…
  • 20. Controlling Introduced Species
    • Once an introduced species is established , it may be difficult to control . Elimination is unlikely, however there are three types of control measures.
  • 21.
    • Perhaps the most widely used control method is the use of pesticides .
  • 22. Chemical Control
    • Pesticides are used mostly on forest and agricultural pests because trees and crops have significant economic value.
  • 23.
    • Pesticides dramatically reduce crop damage, but there are environmental risks. They may kill non-target native species and pollute the air, water and soil.
  • 24. Mechanical Control
    • Some invasive species may be controlled with physical barriers or removal.
  • 25. Mechanical Control
    • Invasive plants can be cut down, burned , or even removed by hand.
  • 26. Mechanical Control
    • Invasive animals can be hunted or trapped .
  • 27.
    • For example, in Hamilton harbour, barriers were constructed to protect valuable wetland from carp , an invasive fish species.
  • 28. Biological Control
    • Biological control is a challenging but effective method of controlling invasive species.
  • 29.
    • Biological control uses intentionally introduced organisms to control the invasive species.
  • 30.
    • For example, three insect species were released in Ontario to control purple loosestrife , an invasive plant that grows in wetlands.