Catalyst 1. Where does all energy in the food web begin? 2. Name the producer 3. Name two primary...

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Catalyst 1. Where does all energy in the food web begin? 2. Name the producer 3. Name two primary consumers. 4. What would happen to the population size of bluebirds if the snails were wiped out by a disease?

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Transcript of Catalyst 1. Where does all energy in the food web begin? 2. Name the producer 3. Name two primary...

Page 1: Catalyst 1. Where does all energy in the food web begin? 2. Name the producer 3. Name two primary consumers. 4. What would happen to the population size.

Catalyst

1. Where does all energy in the food web begin?

2. Name the producer3. Name two primary

consumers.4. What would happen to

the population size of bluebirds if the snails were wiped out by a disease?

Page 2: Catalyst 1. Where does all energy in the food web begin? 2. Name the producer 3. Name two primary consumers. 4. What would happen to the population size.

What If…?

Key Point #2: We can use food webs to predict what will happen when we introduce/take away a species Three important interactions for you to

learn.

Page 3: Catalyst 1. Where does all energy in the food web begin? 2. Name the producer 3. Name two primary consumers. 4. What would happen to the population size.

What do you think will happen to the rabbits, if all the vegetation is destroyed?

If a population loses ALL of its food sources, it will become extinct.

Food Web Interactions

Page 4: Catalyst 1. Where does all energy in the food web begin? 2. Name the producer 3. Name two primary consumers. 4. What would happen to the population size.

What do you think will happen to the cougar, if all of the deer die?

If a population loses SOME of its food sources, it will decrease in size.

Food Web Interactions

Page 5: Catalyst 1. Where does all energy in the food web begin? 2. Name the producer 3. Name two primary consumers. 4. What would happen to the population size.

What do you think will happen to the mice, if all of the foxes are eaten by the cougars?

If a population loses its predators, it will increase in size.

Food Web Interactions

Page 6: Catalyst 1. Where does all energy in the food web begin? 2. Name the producer 3. Name two primary consumers. 4. What would happen to the population size.

Guided Practice (GP) 2

What will happen to the mouse population, if a disease kills all the plants?

A. All will go extinct

B. Increase in sizeC. Decrease in sizeD. Reproduce more

Page 7: Catalyst 1. Where does all energy in the food web begin? 2. Name the producer 3. Name two primary consumers. 4. What would happen to the population size.

Guided Practice (GP) 2

Imagine that a bobcat enters the ecosystem. Bobcats eat insectivorous birds. What will happen to the fox population?

A. All will go extinct

B. Increase in size

C. Decrease in size

D. Move elsewhere

Page 8: Catalyst 1. Where does all energy in the food web begin? 2. Name the producer 3. Name two primary consumers. 4. What would happen to the population size.

Guided Practice (GP) 2

Imagine that a disease kills all of the snakes in the ecosystem. What will happen to predaceous insect population?

A. All will go extinct

B. Increase in size

C. Decrease in size

D. Stop eating herbivorous insects

Page 9: Catalyst 1. Where does all energy in the food web begin? 2. Name the producer 3. Name two primary consumers. 4. What would happen to the population size.

Guided Practice (GP) 2

What will happen to the squirrel population, if a cow wanders by and eats all the plants?

A. All will go extinct

B. Increase in sizeC. Decrease in sizeD. Start eating

toads

Page 10: Catalyst 1. Where does all energy in the food web begin? 2. Name the producer 3. Name two primary consumers. 4. What would happen to the population size.

Guided Practice (GP) 2

What will happen to the rabbit population, if a drought kills all the plants?

A. All will go extinct

B. Increase in sizeC. Decrease in

sizeD. Eat foxes

Page 11: Catalyst 1. Where does all energy in the food web begin? 2. Name the producer 3. Name two primary consumers. 4. What would happen to the population size.

Guided Practice (GP) 2

Imagine that a hunter kills all of the hawks and owls in the ecosystem. What will happen to the seed-eating bird population?

A. All will go extinct

B. Increase in size

C. Decrease in size

D. Begin eating spiders

Page 12: Catalyst 1. Where does all energy in the food web begin? 2. Name the producer 3. Name two primary consumers. 4. What would happen to the population size.

Guided Practice (GP) 2

Pretend that a falcon enters the ecosystem. Falcons eat toads. What will happen to the snake population?

A. All will go extinct

B. Increase in size

C. Decrease in size

D. Stop eating toads

Page 13: Catalyst 1. Where does all energy in the food web begin? 2. Name the producer 3. Name two primary consumers. 4. What would happen to the population size.

Guided Practice (GP) 2

Imagine that a population of bears wanders into the ecosystem. Bears eat foxes. What will happen to the squirrel population?

A. All will go extinct

B. Increase in size

C. Decrease in size

D. Move elsewhere

Page 14: Catalyst 1. Where does all energy in the food web begin? 2. Name the producer 3. Name two primary consumers. 4. What would happen to the population size.

Key Point Wrap-Up

KP#1: A food web shows all the feeding relationships in an ecosystem.

KP#2: We can use a food web to predict what will happen when we introduce/take away a species If a population loses ALL of its food sources, it

will become extinct. If a population loses SOME of its food sources,

it will decrease in size. If a population loses its predators, it will

increase in size.

Page 15: Catalyst 1. Where does all energy in the food web begin? 2. Name the producer 3. Name two primary consumers. 4. What would happen to the population size.

Review Questions

1. What animal does the elk transfer its energy to? 

2. From which level does level B get its energy?

3. What level does level B pass its energy to?

4. In which level does all of the energy end up?

Page 16: Catalyst 1. Where does all energy in the food web begin? 2. Name the producer 3. Name two primary consumers. 4. What would happen to the population size.

Energy reminders

Energy travels UP the food chain

All energy begins with the sun Producers get their energy from the sun

Primary consumers get their energy from the producers

Page 17: Catalyst 1. Where does all energy in the food web begin? 2. Name the producer 3. Name two primary consumers. 4. What would happen to the population size.

Key Point #1:

Only 10% of the energy is passed from one level of the food web to the next Called the “10% rule” The other 90% of energy escapes as heat energy

Page 18: Catalyst 1. Where does all energy in the food web begin? 2. Name the producer 3. Name two primary consumers. 4. What would happen to the population size.

Which level will have the LARGEST amount of energy?

Which level will have the SMALLEST amount of energy?

Page 19: Catalyst 1. Where does all energy in the food web begin? 2. Name the producer 3. Name two primary consumers. 4. What would happen to the population size.

Key Point #2: Energy and biomass levels dramatically decrease as you move up the food chain

Page 20: Catalyst 1. Where does all energy in the food web begin? 2. Name the producer 3. Name two primary consumers. 4. What would happen to the population size.

Energy and Biomass Pyramids

Energy: the ability to do work, comes from Sun or what you eat

Biomass: the total weight made up in plant or animal tissue Bio-: living Mass-: amount of

matter

Page 21: Catalyst 1. Where does all energy in the food web begin? 2. Name the producer 3. Name two primary consumers. 4. What would happen to the population size.

Biomass pyramid

Larger # of living things

Larger # of living things

Larger biomassLarger biomass

More energy(from what??)

More energy(from what??)

Page 22: Catalyst 1. Where does all energy in the food web begin? 2. Name the producer 3. Name two primary consumers. 4. What would happen to the population size.

In a mountain ecosystem you will find…

• Millions of blades of grass• One or two bears

Why are there so few bears???

Page 23: Catalyst 1. Where does all energy in the food web begin? 2. Name the producer 3. Name two primary consumers. 4. What would happen to the population size.

Why are there so FEW bears?

Page 24: Catalyst 1. Where does all energy in the food web begin? 2. Name the producer 3. Name two primary consumers. 4. What would happen to the population size.

What percent of energy moves from level A to level B?

Which level has the largest amount of energy?

Which level has the least amount of energy?

Page 25: Catalyst 1. Where does all energy in the food web begin? 2. Name the producer 3. Name two primary consumers. 4. What would happen to the population size.

1. Which organism will have the HIGHEST amount of energy in the food web?

a. Insectsb. Cougarc. Foxd. Vegetation

Page 26: Catalyst 1. Where does all energy in the food web begin? 2. Name the producer 3. Name two primary consumers. 4. What would happen to the population size.

2. Which organism will have the LOWEST amount of energy in the food web?

a. Insectsb. Cougarc. Deerd. Vegetation

Page 27: Catalyst 1. Where does all energy in the food web begin? 2. Name the producer 3. Name two primary consumers. 4. What would happen to the population size.

3. Which organism will have the HIGHEST biomass in the food web?

a. Insectsb. Cougarc. Foxd. Vegetation

Page 28: Catalyst 1. Where does all energy in the food web begin? 2. Name the producer 3. Name two primary consumers. 4. What would happen to the population size.

4. Which organism will have the HIGHEST amount of energy in the food web?

a. Plantsb. Rabbitsc. Spiderd. Snake

Page 29: Catalyst 1. Where does all energy in the food web begin? 2. Name the producer 3. Name two primary consumers. 4. What would happen to the population size.

5. Which organism will have the LOWEST amount of energy in the food web?

a. Plantsb. Rabbitsc. Spiderd. Snake

Page 30: Catalyst 1. Where does all energy in the food web begin? 2. Name the producer 3. Name two primary consumers. 4. What would happen to the population size.

6. Which organism will have the HIGHEST biomass in the food web?

a. Plantsb. Rabbitsc. Spiderd. Snake

Page 31: Catalyst 1. Where does all energy in the food web begin? 2. Name the producer 3. Name two primary consumers. 4. What would happen to the population size.

Stations

Work in partner pairs4 Stations

Follow station directions Station 2 requires no writing

Stay focused

Page 32: Catalyst 1. Where does all energy in the food web begin? 2. Name the producer 3. Name two primary consumers. 4. What would happen to the population size.

Exit Questions

1. Describe in a complete sentence what is meant by the “10% rule.”

2. What happens to the energy that is not transferred from one level of the food web to the next?3. In the food web above, which level has the greatest energy?

4. Which level has the least biomass?


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