1. Warm up… Arrange the following organisms to show who eats whom:
killer whale
cod fish
krill shrimp
algae
leopard seal

2. Warm up…continued
What might happen to the other organisms if algae were removed from this group?
What might happen if the killer whales were removed?
Are there any organisms in this group that eat more than one kind of food?

3. Energy Flow in Ecosystems

4. All organisms play a role in their ecosystem:
Producer (aka: Autotroph [self-feeder])
Make their own food (usually through photosynthesis)
Ex: plants (even the Venus Flytrap!)

5. All organisms play a role in their ecosystem:
Consumers (aka: Heterotrophs [different feeders])
Can’t make its own food
Gets energy from eating other organisms
Herbivores – eats plants
Carnivores – eats animals
Omnivores – eats plants & animals
Scavengers – eats dead plants & animals

6. All organisms play a role in their ecosystem:
Decomposers
Break down waste and dead organisms to return raw materials to the environment
Ex: bacteria, fungi, worms

7. A world with no decomposers?

8. Venus flytrap – producer
Producer or Consumer?
Venus flytrap – producer
Fly - consumer

9. Producer or Consumer?
Consumer (herbivore)

10. Producer or Consumer?
Producer

11. Producer or Consumer?
Consumer (omnivore)

12. Producer or Consumer?
Consumer (carnivore)

13. Food Chains

14. Energy enters an ecosystem as…
SUNLIGHT!!!

15. Food Chain
Food chain – a diagram that shows how energy in food flows from one organism to another.
Order of the food chain:
Sun – energy source
Producer
1st Level (Primary) Consumer – eats producers (herbivore or omnivore)
2nd Level (Secondary) Consumer – eats 1st level consumers (carnivore or omnivore)
Decomposer – recycles materials for use by producers
Arrows show the direction of the flow of energy!

17. Food webs
Most organisms do not eat the same thing every day, so they are part of more than one food chain.
Food web - a diagram that shows the feeding relationships between organisms in an ecosystem

18. Food Web

19. Food webs
What happens if we remove an organism?

20. Summary
3 – What are the three roles that organisms play in an ecosystem. Describe each.
2 – What are two examples of a decomposer?
1 – Create a food chain that includes & ends with you.

21. Energy & Matter

22. Flow of energy
When an organism eats, it obtains energy, then uses a lot of energy in life process like growth and movement.
This means that only part of their energy is available to the next organism in the food web.

23. Energy Pyramid
Energy pyramid - a diagram that shows an ecosystem’s loss of energy
What is the purpose?
To show the amount of energy that moves from one feeding level to another in a food web
Facts:
The greatest amount of energy is available at the producer level
The least amount of energy available to going to be a the top of the food chain.
Energy Pyramid Video Clip

24. Energy Pyramids

25. Energy Pyramid

26. Energy Pyramid Model Follow my directions to make the pyramid.
The following information should be on each side of your pyramid:
Side 1: “Key” for an Energy Pyramid
Side 2: Food Chain with 3 levels of consumers
Side 3: Energy Pyramid for your Food Chain

27. Side 1: Key for an Energy Pyramid
Label each level with the type of organism (producer, 1st level consumer, etc.) and amount of energy.
1 kcal
10%
3rd Level or
Tertiary Consumers
10 kcal
2nd Level or
Secondary Consumers
10%
1st Level or Primary Consumers
100 kcal
10%
Producers
1000 kcal

28. Side 2: Food Chain Food Chain:
Illustrate a food chain that includes 3 levels of consumers.
Food Chain: ? ? ? ?

29. Side 3: Energy Pyramid for your Food Chain
Illustrate an energy pyramid for your food chain.