1. Energy Flow

2. Review Autotroph is an organism that produces its own food
Example – plants
Heterotroph is an organism that CANNOT produce its own food. It needs to ingest other organisms to survive.
Example – humans, bears, rabbits

3. Trophic level
Level of the food chain based on organisms source of energy
Producer, consumer, decomposer

4. Trophic level

5. Producer Gets energy from the sun through photosynthesis
Plants, algae, some bacteria

6. Consumer
Gets energy from producers or other consumers

7. Decomposer
Detritivore that gets energy form organic waste and dead organisms
Examples: Mushrooms

8. Food Chain / Energy Pyramid
Energy pyramid – each trophic level is represented by a block, the size of the block represents the biomass
Autotrophs are found on the bottom level (producers)
Heterotrophs are consumers and can be found on any level above the bottom level

9. Biomass
The weight of matter found in the ecosystem

10. Herbivore An organism that eats only plants.
These are 1st level consumers

11. Carnivore An animal that eats other animals
These are 2nd and 3rd level consumers

12. Omnivore An animal that eats both plants and other animals
These can be found anywhere on the pyramid

13. Detritivore Feeds on dead plants and animals
These are important because they bring energy back into the energy pyramid after an organism dies

14. Arrows represent energy flow
Food Chain vs Food Web
Arrows represent energy flow

15. 10% Rule
100% E
10% E
1%E
0.1%E
Both energy and biomass are reduced by 10% as they move up the energy pyramid
The energy that does not move up the pyramid is lost as heat to the atmosphere