Food Chains and Food Webs

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Food Chains and Food Webs

• What's for dinner?"

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Food Chains

• A food chain is the sequence of who eats what in
  a ecosystem.

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Food Chains

• A food chain starts with an energy source.
• The sun
• Deep sea vents
• In our woods, what was the primary energy source?
• CD

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Food Chains

• The 1rst link in the chain is an organism that
  makes its own food from the energy source.
• Usually photosynthesis
• These are called Primary Producers
• Or Autotrophs.

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Food Chains

• In our woods, what are the Autotrophs?
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• How bout the pond, what are the Primary
  Producers?
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Food Chains

• Next come organisms called primary consumers.
• These are the organisms that eat the autotrophs.
• Organisms that eat plants are called herbivores.
• An example is a bunny that eats grass

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Food Chains

• Next link in the chain are the animals that eat
  herbivores.
• These are called secondary consumers.
• an example is a snake that eat bunnies.

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Food Chains

• These animals (the secondary consumers) are eaten
  by larger predators called tertiary consumers.
• For example, owls eat snakes...

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Check out these food chains.
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Food Chains

• Primary producers are autotrophs.
• Primary consumers are herbivores (plant-eaters).
• Eat secondary consumers.
• Secondary consumers are carnivores (meat-eaters)
  or omnivores (animals that eat both animals and
  plants).
• Eat secondary consumers.
• Tertiary consumers are carnivores or omnivores
• Eat secondary consumers.
• Quaternary consumers are carnivores or omnivores
• Eat tertiary consumers.

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Food Chains

• The arrows in a food chain show the flow of
  energy, from the source to a top predator. As the
  energy flows from organism to organism, energy is
  lost at each step.

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Food Chains

• A network of many food chains is called a food
  web.

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More Players in a Food Web

• When any organism dies,
• It is eaten by detrivores
• (worms, maggots,crabs)
• It is broken down by decomposers
• (bacteria, fungi)

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Food Webs
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Food Webs
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Food Webs
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Food Webs