1. Trophic Efficiency
p. 306

2. Review:
Trophic Level: Feeding level of an organism in a food chain or web.
a) Trophic level 1 = plants
b) Trophic level 2 = herbivores
c) Trophic level 3 = carnivores that eat the herbivores.
d) Trophic level 4 = carnivores that eat other carnivores (usually the top carnivore)

4. Energy in an Ecosystem
The quantity of energy that is transferred from one level to the next is about 10%.

5. Pyramid of Energy
Measures the total chemical energy circulating between each trophic level.
10% of energy is passed on to the next trophic level.

6. Energy Pyramid

7. To feed more humans at once, it is more efficient to eat from shorter food chains.
Grains → Humans
Grains → Cow → Humans

8. Feeding Consumption of most North Americans
Consumption of meat – comparing different countries

9. Video – “Meat” the Truth Maybe the future?
Video – “Meat” the Future
Discuss

10. To Do:
Notes
Activity – From Land to Mouth

11. In Conclusion...
Compared to animals, green plants produce more energy per unit per area of land.
Most energy in ecosystems or agricultural land comes from plants.
So, animals produce less energy than plants cultivated on the same area of land.