Download - 5.1: Natural Phenomena and Ecosystems
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5.1: Natural Phenomena and
EcosystemsCh: 5 Changing the Balance in Ecosystems
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Typhoon Haiyan homeless
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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.
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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.
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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.
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http://www.youtube.com/watch?v=-H_HZVY1tT4
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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.
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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.
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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.
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http://www.youtube.com/watch?v=yo69NtUMXBY
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B. Geological events Some natural phenomena are the result
of geological activity in Earth’s crust.Examples: Volcanic eruptions,
tsunami
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Volcanic EruptionNegative
Habitat destruction Vegetation covered
by ash Landslide Ash in atmosphere
Positive New lakes New soils