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Invasive Species

Invasive Species. Invasive Species: an organism that is not native to a specific location Also called an introduced species Often have a tendency to spread, which is believed to cause damage to the environment, human economy and/or human health Asian long-horned beetle Pest!

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Invasive Species

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  1. Invasive Species • Invasive Species: an organism that is not native to a specific location • Also called an introduced species • Often have a tendency to spread, which is believed to cause damage to the environment, human economy and/or human health • Asian long-horned beetle • Pest! • Cause death of elm, maple, poplar, and willow trees

  2. Pollution

  3. https://www.youtube.com/watch?v=CVm1pB3iJOw • https://www.youtube.com/watch?v=-OVNd6Fa9fg (0:27 – 4:10)

  4. Acid Rain • Overview of the water cycle:

  5. Acid Rain • What happens when pollutants from man-made and natural sources enter the water cycle?

  6. Acid Rain • Pollutants come from: • Natural sources, such as volcanoes and decaying vegetation • Man-made sources, such as exhaust from vehicles and burning fossil fuels • Acid Rain: rain that is acidic and that is harmful to the environment

  7. Acid Rain • Sulphur dioxide and nitrogen oxides are the gases involved • Form sulphuric acid and nitric acid • pH Scale: a scale to measure how acidic or basic something is • 0 = most acidic • 7 = neutral • 14 = most basic

  8. Acid Rain • Acid rain has a pH value of around 4.2-4.4 • This is about 10 times higher than normal rain

  9. Acid Rain • Acid rain has many harmful effects on the environment • Forests • Ruins the soil • Trees grow more slowly • Lose their leaves • Die

  10. Acid Rain • Lakes and ponds • Fresh water becomes more acidic • Fish and other organisms living there can die

  11. Acid Rain • Human Life • Ruins metals and sculptures • Respiratory issues

  12. Oil Spills • Form of human pollution • Release of crude oil from tankers, drilling rigs and wells • Most spills occur in the water and ruin marine ecosystems • Can take years to clean up

  13. Oil Spills • Exxon Valdez (1989) • Approx. 100,000m3 of crude oil released • Wildlife was severely affected • Up to 250,000 seabirds • 300 seals • 247 bald eagles • 22 orcas

  14. Oil Spills – Demonstration • What happens to the feather when it is covered with oil? • Weight? Texture? • What worked best in removing the oil? • What are some consequences of oil spills on birds? On the rest of the ecosystem?

  15. Pests and Pesticides

  16. Pests & Pesticides • Pest: any organism that is causing plants to produce less that they otherwise would • Insects  eat the plants • Weeds  steal nutrients, light, and space from the plants • Fungi  cause infections which can destroy a plant

  17. Pests & Pesticides

  18. Pests & Pesticides • What else could you consider a pest? • Agroecosystem: unit of agricultural activity, including the living and non-living components involved and their interactions • Pesticides: substances meant for destroying insects or other organisms harmful to cultivated plants

  19. Pests & Pesticides • Bioaccumulation: the build-up of toxic substances, such as pesticides, in an organism • Bioamplification (or Biomagnification): the concentration of a toxic substance increases in organisms higher up in the food chain

  20. Pests & Pesticides • DDT  dichlorodiphenyltrichloroethane • Colourless, tasteless insecticide • Banned worldwide in 2001 • Bald Eagles

  21. Bioaccumulation Amount of chemical in prey x number of prey consumed = amount of chemical in predator • Amount of DDT in prey (mg) • Ex. 5mg • Number of prey organisms consumed • Ex. 10 mice • Amount of DDT accumulated by predator (mg) • Ex. 50mg

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