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Food Chains and Food Webs

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Food Chains and Food Webs What's for dinner? – PowerPoint PPT presentation

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Title: Food Chains and Food Webs


1
Food Chains and Food Webs
  • What's for dinner?"

2
Food Chains
  • A food chain is the sequence of who eats what in
    a ecosystem.

3
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

4
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5
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.

6
Food Chains
  • In our woods, what are the Autotrophs?
  • CD
  • How bout the pond, what are the Primary
    Producers?
  • CD

7
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8
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

9
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10
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.

11
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12
Food Chains
  • These animals (the secondary consumers) are eaten
    by larger predators called tertiary consumers.
  • For example, owls eat snakes...

13
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14
Check out these food chains.
15
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.

16
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.

17
Food Chains
  • A network of many food chains is called a food
    web.

18
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)

19
Food Webs
20
Food Webs
21
Food Webs
22
Food Webs
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