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Grade 9-U3-L9-Invasive species


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invasive species

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Grade 9-U3-L9-Invasive species

  1. 1. Invasive SpeciesInvasive Species
  2. 2. Non-Native SpeciesNon-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. 3. Non-Native SpeciesNon-Native Species The introduction of non-native or exotic species to an ecosystem by humans is a major cause of species loss.
  4. 4. Non-Native SpeciesNon-Native Species Introductions of non- native species usually fail because so few species can tolerate an entirely new environment.
  5. 5. Non-Native SpeciesNon-Native Species Remember that for a species to survive it must be within its tolerance range for all abiotic factors.
  6. 6. Non-Native SpeciesNon-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. 7. Occasionally, an introduced species is successful in its new environment… zebra mussels
  8. 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. 9. When a population is unchecked, it gains an advantage over native species. It can increase rapidly and become invasive.
  10. 10. Invasive species are introduced species with growing populations that spread and have a negative effect on their environment.
  11. 11. Non-Native SpeciesNon-Native Species There are well over 3000 invasive species in Canada. In the Great Lakes, there are over 185 invasive species.
  12. 12. European Earwig
  13. 13. European Starling
  14. 14. Carp
  15. 15. Non-Native SpeciesNon-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. 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. 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. 18. Small seeds are equally difficult to detect…
  19. 19. Controlling Introduced SpeciesControlling 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.
  20. 20. Perhaps the most widely used control method is the use of pesticides.
  21. 21. Chemical ControlChemical Control Pesticides are used mostly on forest and agricultural pests because trees and crops have significant economic value.
  22. 22. Pesticides dramatically reduce crop damage, but there are environmental risks. They may kill non- target native species and pollute the air, water and soil.
  23. 23. Mechanical ControlMechanical Control Some invasive species may be controlled with physical barriers or removal.
  24. 24. Mechanical ControlMechanical Control Invasive plants can be cut down, burned, or even removed by hand.
  25. 25. Mechanical ControlMechanical Control Invasive animals can be hunted or trapped.
  26. 26. For example, in Hamilton harbour, barriers were constructed to protect valuable wetland from carp, an invasive fish species.
  27. 27. Biological ControlBiological Control Biological control is a challenging but effective method of controlling invasive species.
  28. 28. Biological control uses intentionally introduced organisms to control the invasive species.
  29. 29. For example, three insect species were released in Ontario to control purple loosestrife, an invasive plant that grows in wetlands.