Food Chains and Food Webs

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Food Chains and Food Webs
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Autotrophs

• Autotrophs are producers - Organisms that use
  energy from the sun to manufacture their own
  nutrients

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Heterotrophs

• Heterotrophs are consumers Organisms that
  cannot manufacture their own food and must feed
  on other organisms

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1st Order Heterotrophs

• Feed directly on autotrophs
• Also known as herbivores

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2nd Order Heterotrophs

• Feed on first-order heterotrophs
• They are carnivores

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3rd Order Heterotrophs

• Carnivores that feed on 2nd order heterotrophs

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Scavengers

• Scavengers feed on carrion and refuse

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Decomposers

• Decomposers organisms that break down complex
  molecules of dead and decaying plants and animals

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Omnivores

• Omnivores feed on both plants and animals

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Food Chains

• A simple model that shows how matter and energy
  can move through an ecosystem.
• Each organism in a food chain represents a
  feeding step called a trophic level.

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Food Chains
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Food Webs

• A food web expresses all of the possible feeding
  relationships between individuals in a community.

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Food Web