Warm-Up

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Warm-Up

• Where does a producer receive energy from?

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• THE SUN!!

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Review Interactions in an Ecosystem

• Level 1 Producer
• Level 2 Primary Consumers
• Level 3 Secondary Consumer
• Level 4 Tertiary Consumer

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10 of energy is transferred to the next trophic
level
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Make your own

• Label the levels of the food pyramid
• If you were given the organisms snake, grass,
  hawk and mouse
• Where would they go?

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This is what you should have
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Label each organism as a producer or consumer
Label each as an autotroph or heterotrophEx.
Hawk in Level 4 is a.Consumer/Heterotroph
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This is what you should have
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• If level one starts with 4,000 kcal of energy
  label the energy transferred to each level
• Remember only 10 of the energy is transferred

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4 kcal
40 kcal
400 kcal
4000 kcal
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Food Chain

• Linear flow of energy
• Ex). Leaves ? Slug ? Frog ? Heron

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Use the food pyramid above and turn it into a
food chain.
Food Chains always start with the producer!
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You should have

• Grass ? Mouse ? Snake ? Hawk
• If level 1 has 16,000 kcal of energy label the
  energy transferred at each level.

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• Grass ? Mouse ? Snake ? Hawk
• (16000) ? (1600)? (160) ? (16)
• Label each organism as an autotroph
• or heterotroph as well as a consumer or a
  producer.

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Lets Practice

• Looking at Energy Transfer

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Agenda

• Notes on Evaluating Food Webs, Chains and
  Pyramids
• Practice- Interpreting Food Webs, Chains and
  Pyramids

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• 1. FOOD CHAIN
• If an organism has an arrow going away from it,
  it is being eaten (Giving energy to another
  organism)
• If an organism has an arrow going towards it, it
  is eating another organism (Receiving energy from
  that organism)

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• The plant is being eaten by the aphid
• Giving energy to the aphid
• The aphid is being eaten by the spider
• Giving energy to the spider
• The spider is being eaten by the sparrow
• Giving energy to the sparrow

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• Food Pyramid
• Why is the bottom of the food pyramid bigger than
  the top?
• It has more organisms and more energy

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• Label the trophic level with the most energy and
  the least energy.

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Label the trophic level with the most organisms
and the least number of organisms.
10 or energy is passed to each trophic level,
therefore fewer energy and fewer organisms.
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3. FOOD WEB

• Shows interaction between many organisms in an
  ecosystem

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• 3. FOOD WEB
• If an organism has an arrow going away from it,
  it is being eaten (Giving energy to another
  organism)
• If an organism has an arrow going towards it, it
  is eating another organism (Getting energy from
  that organism)

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If an organism has both arrows (one going away
and one going towards it) it is eating an
organism and then is being eaten by another
organism

• Example the Frog

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The organism that ONLY has arrows going away from
it meansIt does not get energy from other
organismsHas to get energy from the sunIs,
therefore, a producer
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Lets Practice!

• Determine if each are receiving energy or giving
  energy

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Grass

• Giving energy to Mice and grasshoppers

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Mice

• Receives energy from Grass and Grasshoppers and
  gives energy to Owls and skunks

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Grasshoppers

• Receives energy from the grass and Gives energy
  to the mice and skunks

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Skunks

• Receives energy from mice and grasshoppers and
  Gives energy to owls

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Owls

• Receives energy from mice and skunks and Gives
  energy to NOTHING
• They are tertiary consumers

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Make your own food chain!

• Rabbits feed on seeds
• Snakes eat rabbits
• Hawks eat snakes

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Correct answer.

• Seeds ? Rabbit ? Snake ? Hawk

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Seeds ? Rabbit ? Snake ? Hawk

• What would happen to the following animals if
  seeds were removed?
• Rabbit?
• Snake?
• Hawk?

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Seeds ? Rabbit ? Snake ? Hawk

• Rabbits would decrease
• Snakes would decrease
• Hawks would decrease

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Make your own pyramid

• Fish feed on Plankton
• Plankton feed on Algae
• Sharks feed on Fish

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Food Pyramid
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What would happen to the other animals if shark
became extinct?

• Fish?
• Plankton?
• Algae?

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Practice

• The tree is an organism in our ecosystem that is
  being overused. It is used as firewood, paper,
  lumber and other various duties. Replanting
  trees is an effort that will increase tree
  numbers, yet the time to grow the trees cannot
  keep up with how quickly trees are being cut and
  used.

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Questions

• How can this decrease in trees affect our
  ecosystem?
• People begin to replant trees in an effort to
  increase the number of tree in our ecosystem.
• How would replanting trees affect the rest of the
  other biotic factors of our ecosystem?

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• Practice Interpreting Food Chains, Webs
  Pyramids