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5.1: Natural Phenomena and Ecosystems

5.1: Natural Phenomena and Ecosystems. Ch : 5 Changing the Balance in Ecosystems. Typhoon Haiyan. homeless. Recall from Ch : 2 that natural ecosystems maintain a dynamic equilibrium . Biotic and abiotic factors change over time. Natural events are part of our biosphere’s dynamic quality

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5.1: Natural Phenomena and Ecosystems

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  1. 5.1: Natural Phenomena and Ecosystems Ch: 5 Changing the Balance in Ecosystems

  2. Typhoon Haiyan • homeless

  3. Recall from Ch: 2 that natural ecosystems maintain a dynamic equilibrium. Biotic and abiotic factors change over time. • Natural events are part of our biosphere’s dynamic quality • Eg: Volcanic eruptions, earthquakes, tsunamis  have both negative and positive consequences.

  4. What happens after a natural phenomena? Healthy ecosystems will respond by adapting. The time taken to adapt may vary. Natural succession may create a similar ecosystem as was previous, but not necessarily.

  5. Case Study #1: Mount St. Helens • Erupted May 18th, 1980 • Wiped out the surrounding ecosystem. • Debris flow filled river valleys killing aquatic organisms. • Hot ash burned hundreds of old-growth forest.

  6. http://www.youtube.com/watch?v=-H_HZVY1tT4

  7. A. Weather related phenomena • Eg: Floods, droughts, tornados, hurricanes, blizzards, infestations. • The warming of atmospheric air and ocean temperature are contributing to the severity of weather related phenomenon.

  8. Case Study #2: Pine Beetle • Pine Beetle has infected acres of trees across British Columbia. • Live inside the bark and digest sapwood. • Beetle cuts off trees nutrients and obstructs water movement.

  9. How does weather play a role? In previous years the pine beetle population has been kept in check as many larvae were killed off during cold, winter months. Now BC climate has become milder.

  10. http://www.youtube.com/watch?v=yo69NtUMXBY

  11. B. Geological events Some natural phenomena are the result of geological activity in Earth’s crust. Examples: Volcanic eruptions, tsunami

  12. Volcanic Eruption Negative Positive New lakes New soils • Habitat destruction • Vegetation covered by ash • Landslide • Ash in atmosphere

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