1. Science 2200
Energy flow

2. Review Trophic Levels
Fill in the levels

3. Where do each of the following get energy?
Producers?
Herbivores?
Carnivores?

4. Where do each of the following get energy?
Producers get energy from the sun
Herbivores get their energy from consuming plants/producers
Carnivores get their energy from consuming herbivores.

5. Energy Pyramid
Is a diagram to show how energy moves and transfers through an ecosystem.

6. Question! Where is most of the energy?
Where does the rest of the energy go?

7. About 10% of energy is transferred

8. Where does the missing energy go?
Not all energy gets transferred
The “missing energy” has been used for living functions such as:
growth,
movement,
reproduction
lost as heat
Some is indigestible to the consumer

10. At lower trophic levels there are greater numbers and greater mass of organisms than at higher trophic levels

11. Pyramid of Numbers - A diagram that shows how many organisms are in each trophic level.

12. Pyramid of Biomass - a diagram that shows how much dry mass is in each trophic level.

13. Activity Using the following simple food chain:
plants -->mouse--> snake--> Hawk
construct an energy pyramid, include change in energy!

14. humans have changed the flow of energy
Early humans had very little impact
However, as the population of humans increased so did their need for more energy (food).

15. humans have changed the flow of energy
This decreased producer (energy source) for other consumers and caused species to be extirpated or extinct
Video - Top ten extinct by humans:

16. “Sampling Populations” activity