Fire

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Fire
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Succession

• Primary Succession
• No soil, Lichens/pioneer community
• eg. Volcanic island
• Secondary Succession
• A disturbance has destroyed an existing community
  but left the soil intact.

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Your off to the vacation of your life, and
discover that your dreamland is barren rock!
But you decide to stay awhile anyway.
What do you observe over time?
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What is the main abiotic factor that
distinguishes primary from secondary succession?
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Energy Flow
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Food Web
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Energy Supply-E Pyramid

• The energy supply decreases with each trophic
  level, only 6-16 of the Energy entering one
  trophic level becomes available to organisms
  of the next level.

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So, based on what you know about Energy flow.

• You are appointed to figure out the best means of
  feeding thousands of starving people of a third
  world country..
• What would be the best food to feed them??????

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Trophic level

• Im eating a cheese pizza. At which trophic
  level(s) am I feeding?

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Why ask why?

• In the who eats whom dynamics of a food web,
  even consumers of the highest level in the
  ecosystem eventually become food for who?

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Why ask why?

• Why is a pound of bacon more expensive than a
  pound of corn?

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Raindrops keep fallin on my head

• The Water cycle
• What is the main way that life contributes to
  the water cycle?

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The Carbon Cycle

• What is the main abiotic reservoir for carbon?

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Human alteration of chemical cycles

• What would happen to the carbon cycle if all the
  detritivores suddenly went on strike and
  stopped working?