1. Catalyst
5 min
1. In the food web above, what animal would be immediately effected if the deer population decreased?
2. In the food web above, what would happen to the frog population if the rabbit population increased?

2. Materials: half sheet from side table
On a HALF SHEET OF NOTEBOOK PAPER, answer the following question: 1. Ms. Nay’s sister is getting married on Saturday. What is some advice you have for the newly married couple? (can be serious, funny, etc.)

3. Elite Eight Trait Check-Up
Respect the Threshold
Everyone on time?
Silent for First Five?
Be Prepared (2 min)
Seated
Have materials
Working on catalyst

4. Class Motto
If there is a problem, We look for a solution. If there is a better way, We find it. If we need help, We ask. If a teammate needs help, We give.

5. Announcements Star Quiz 9 on Monday/Tuesday
Unit 2 Test next Thursday/Friday

6. Objectives
I can determine which level of an energy pyramid can support the most organisms and which can support the least.
I can calculate how much energy is at each trophic level of an energy pyramid.

7. FOOD WEB RECAP Bill Nye Video:
Name a food from the video that a carnivore would eat
Name a food that a primary consumer would eat
Name an omnivore in that video
Where does all energy originate from?
What is being passed from producers to consumers in a food chain?

8. Types of Consumers RECAP
herbivores
Only eat plants
Example: rabbits
carnivores
Only eat meat
Example: lions
omnivores
Eat both plants and animals
Example: bears

9. Orders of Consumers Consumers can also be divided into levels Primary
herbivores
Example: rabbit
Secondary
Eat herbivores
Example: snake
Tertiary
Eat animals that eat other animals
Example: eagle

10. Energy Pyramid Example

11. Did you notice anything about the number of organisms at each level?
The number of organisms decreases as you go up in levels
Producers are the most common and tertiary consumers are the least common.

12. Trophic level: the position an organism occupies on a food chain or food web
Only 10% of energy at each level is transferred onto the next level
90% of the energy is used up by bodily functions
This means 100 producers can only support 10 primary consumers and 1 secondary consumer

13. Energy Pyramids Producers have the most energy
Third-order consumers take in the least amount of energy
This is also why the population size of third-order consumers is small

14. Conservation of Energy
Law of conservation of energy:
Energy is neither created nor destroyed

15. Energy loss! Every step up the energy pyramid 90% of energy is lost
That means only 10% of energy moves up each level
If energy is neither created nor destroyed, what happens to the energy that is lost?

16. The Loss of Energy Pyramid
Pyramid of Energy
Heat
Remember the 10% rule
Each trophic level up the pyramid, 90% of energy is lost as heat- only 10% makes it up
0.1% Consumers
Heat
1% Consumers
10% Consumers
Heat
Heat
100% Producers
Parasites, scavengers, and decomposers feed at each level.

17. Calculating 10%
When you move up just one level you only keep 10% of the energy. An easy way to calculate 10% is to move the decimal point to the left one place.
10% of 130 = 13.0
10% of 38189=
10% of 10 = 1.0
10% of .1 =__________
10% of 1000 = _________
Pyramid of Energy
Heat
0.1% Consumers
Heat
1% Consumers
.01
10% Consumers
Heat
100
Heat
100% Producers
Parasites, scavengers, and decomposers feed at each level.

18. The Loss of Energy Pyramid
kCal
Abbreviation for kilocalories
Unit of energy
If the producers have 1000 kilocalories (kcal) how much energy is at the secondary consumer level?
Sketch a pyramid and label it
Count how many levels up-2
For each level calculate 10% of the previous level ?
1000 kcal

19. Going the opposite way
If you have to move down trophic levels (aka start at the top of the pyramid), you can multiply by 10 per level. An easy way to do that is to move the decimal point to the right one space (or add a 0 at the end of the number)
If you have 20 kcal at the secondary consumer level and move down a trophic level to primary consumer- multiply 20 kcal by 10 = 200 kcal

20. Going the opposite way
Given the following energy pyramid, calculate the amount of energy at the primary producer level

22. 1,000
10,000

23. Work Time
The half sheet is due on MONDAY. DO NOT TURN IT IN TO THE SUB!

24. Panther Pass

25. 1. What trophic level has the least amount of matter or energy?
Producers
Primary consumers
Secondary consumers
Tertiary consumers
2. Lettuce produces 100 calories of energy from sunlight. How many calories of energy does a rabbit get from eating a head of lettuce?

26. What percentage of energy is LOST to the atmosphere between trophic levels?
Are there more organisms at the tertiary level of the energy pyramid or the primary level?