1. How is an organism’s energy role determined in an ecosystem?
Ecosystems
How is an organism’s energy role determined in an ecosystem?
Ocean Ecosystem
Desert Ecosystem
Forest Ecosystem

2. Ecosystems – Energy Roles
The Producers:
Get energy by making their own food - photosynthesis
Examples are plants, algae and plankton.

3. Ecosystems – Energy Roles
The Consumers:
Organisms that get their energy from eating food.

4. Ecosystems – Energy Roles
The Decomposers:
Organisms that get energy by breaking down dead organisms.
Examples are bacteria and fungi.

5. Energy in an Ecosystem
What is the source of all energy in an ecosystem?
Photosynthesis – using sunlight as energy to convert carbon dioxide and water into food.
6H2O + 6CO > C6H12O6+ 6O2

6. Ecosystems – Energy Roles
Three types of consumers
Carnivores – eat only other animals (meat eaters)
Omnivores – eat plants and other animals
Herbivores – eat only plants

7. Ecosystems – Energy Roles
Scavenger:
Carnivores that feed on dead organisms.

8. Ecosystems – Energy Roles
Difference between scavenger and decomposer?

9. Food Chains:
Third level
consumer
Shows a specific series of feeding events in an ecosystem.
Every feeding moves energy through an ecosystem.
The Producers are always at the bottom.
Arrows can be replaced by the phrase “is eaten by..”
Second level
consumer
First level consumer
producer

10. Food Webs Many overlapping food chains
Show feeding relationships for the whole ecosystem. -
Food Chain
Food Web

11. Food webs -

12. What does an energy pyramid show?
The amount of energy that moves from one feeding level to another.

13. How does the amount of energy at one level of an energy pyramid compare to the amount of energy available at the next level up?
There is more energy at the lower levels. As you move up energy is lost
Decreasing energy

14. Energy Pyramids 10% of energy is transferred 90% of energy is lost
Decreasing energy
Energy not transferred is used by the organism or lost as heat.

15. Energy Flows and matter is Cycled in an ecosystem
Energy is supplied by the sun.
Energy is lost as it flows through the ecosystem.
Basic elements (matter) is continuously recycled through an ecosystem.