Description:Description:Discuss the change in available energy from Discuss the change in available energy from one trophic level to the next and what the one trophic level to the next and what the energy change implies on the organisms found energy change implies on the organisms found in the levels. Relate trophic pyramids and food in the levels. Relate trophic pyramids and food chains/web.chains/web.

Goals:Goals:Describe the Concept of the Trophic Levels

Distinguish between food chains and webs.

Define ecological pyramid and explain its relationship to energy in the ecosystem

Objectives: Day 3Objectives: Day 3•Describe each level of the Trophic Pyramid in Describe each level of the Trophic Pyramid in terms of available energy.terms of available energy.

•Interpret and describe food chains and food Interpret and describe food chains and food webs.webs.

•Describe the relationship between food Describe the relationship between food chains/webs and the trophic pyramid.chains/webs and the trophic pyramid.

OmnivoresOmnivores

TopTop

ConsumerConsumer Secondary ConsumerSecondary Consumer

(Carnivores)(Carnivores)

Primary ConsumersPrimary Consumers (Herbivores)(Herbivores)

Primary ProducersPrimary Producers

(Autotrophs)(Autotrophs)

Decomposers Scavengers

Warm-UpWarm-Up PART 1PART 1

Q = Fill in the ChartQ = Fill in the Chart

A =A =

Name all 6 kingdoms of life and provide Name all 6 kingdoms of life and provide one fact about each.one fact about each.

QuizQuiz

Objectives: Day 3Objectives: Day 3•Describe each level of the Trophic Pyramid in Describe each level of the Trophic Pyramid in terms of available energy.terms of available energy.

•Interpret and describe food chains and food Interpret and describe food chains and food webs.webs.

•Describe the relationship between food Describe the relationship between food chains/webs and the trophic pyramid.chains/webs and the trophic pyramid.

Design an Energy Design an Energy PyramidPyramid

Now add examples to each roleNow add examples to each role Ex. Instead of Ex. Instead of Primary ProducerPrimary Producer use a plant use a plant

Warm-UpWarm-Up PART 2PART 2

Red Fox

Deer Mouse

Blackberry bush

Think…Think… Consider the trophic pyramid:Consider the trophic pyramid:

Which levels generally have predators and/or prey?Which levels generally have predators and/or prey?

Is there a relationship to physical size of the Is there a relationship to physical size of the organism and location on the pyramid?organism and location on the pyramid?

Which organism need the greatest amount of food Which organism need the greatest amount of food to survive?to survive?

What is the purpose of food?What is the purpose of food?

Pair…Pair… Consider the trophic pyramid:Consider the trophic pyramid:

Which levels generally have predators and/or prey?Which levels generally have predators and/or prey?

Is there a relationship to physical size of the Is there a relationship to physical size of the organism and location on the pyramid?organism and location on the pyramid?

Which organism need the greatest amount of food Which organism need the greatest amount of food to survive?to survive?

What is the purpose of food?What is the purpose of food?

Share…Share… Consider the trophic pyramid:Consider the trophic pyramid:

Which levels generally have predators and/or prey?Which levels generally have predators and/or prey?

Is there a relationship to physical size of the Is there a relationship to physical size of the organism and location on the pyramid?organism and location on the pyramid?

Which organism need the greatest amount of food Which organism need the greatest amount of food to survive?to survive?

What is the purpose of food?What is the purpose of food?

Trophic Levels and EnergyTrophic Levels and Energy

Predict in your “Pair”Predict in your “Pair” In what way is energy In what way is energy

transferred from one organism transferred from one organism to another?to another?

Where would you expect there Where would you expect there to be the greatest amount of to be the greatest amount of energy available?energy available?

Where would be the least?Where would be the least?

What does that mean for the What does that mean for the organisms on the different trophic organisms on the different trophic levels? levels?

Trophic Levels and EnergyTrophic Levels and EnergyShare your thoughts with Share your thoughts with

the class!the class! In what way is energy transferred In what way is energy transferred

from one organism to another?from one organism to another?

Where would you expect there to Where would you expect there to be the greatest amount of energy be the greatest amount of energy available?available?

Where would be the least?Where would be the least?

What does that mean for the What does that mean for the organisms on the different trophic organisms on the different trophic levels? levels?

Energy Energy LossLossat each at each StepStep

Each Trophic Level Each Trophic Level has energyhas energy

90% of the energy is 90% of the energy is lost when moving lost when moving from one level to the from one level to the next.next.

10%

1%

.01%

0.01%

100%

The loss of energy affects the organisms in the Ecosystem

If there’s less energy to survive, then there are less organisms!

So what happens to the number of organisms as you move from Primary Produces to Primary Consumers to Secondary Consumers?

Food ChainsFood Chains

Food Chains = Sequence of energy Food Chains = Sequence of energy being transferred from one organism to being transferred from one organism to another.another.

Trophic Levels = each step of energy Trophic Levels = each step of energy transfertransfer

ISN’T ISN’T THISTHISA FOOD A FOOD CHAIN!CHAIN!

Blackberry bush

Deer Mouse

Red Fox

Many Food Chains in each Many Food Chains in each EcosystemEcosystem

If you take all of the food If you take all of the food chains in an ecosystem you chains in an ecosystem you get a Food Webget a Food Web

So what does a Food Web So what does a Food Web show?show?

??

Food webs show all of the possible Food webs show all of the possible transfers of energy in an ecosystem.transfers of energy in an ecosystem.

So which is more So which is more complex?complex?

Food Webs or Food Chains?Food Webs or Food Chains? Why?Why?

Use the packet of Use the packet of pictures too…pictures too…

Categorize the organisms into:Categorize the organisms into: Primary Source for EarthPrimary Source for Earth ProducersProducers HerbivoresHerbivores CarnivoresCarnivores

Now make three food chainsNow make three food chains Include a primary producer, primary Include a primary producer, primary

consumer, secondary consumer, top consumer, secondary consumer, top consumerconsumer