1. Energy Transfer in Ecosystem
Vocabulary
Trophic = nutrition
Autotrophs
Heterotrophs

2. Autotrophs (Producers)

3. Heterotrophs (Consumers)

4. Heterotrophs Consumers
1. Scavengers feed on the tissue of dead organisms (both plans and animals)

5. Heterotrophs
Consumers
2. Herbivores eat ONLY plants.

6. Heterotrophs
Consumers
3. Carnivores eat ONLY animals.

7. Heterotrophs
Consumers
4. Omnivores eat BOTH plants and animals

8. Heterotrophs
Decomposers absorb any dead material and break it down into simple nutrients or fertilizers

9. Transfer of Energy

10. Trophic Levels…
…represent different levels in a food web.

11. Food Webs
We represent the energy flow from one trophic level to another as a food web.
(Most organisms eat more than one different species.)

12. Food Web Notice that the direction the arrow points 
The arrow points in the direction of the energy transfer, NOT “what ate what”.

13. Ecological Pyramid 1. Which level has the most energy?
2. Which level has the most organisms?
3. Which level has the fewest organisms?
4. Which level has the least energy?

14. Ecological Pyramid