Trophic levels—energy transfer

  • A trophic level is a step in a food web or food chain
  • Trophic levels show energy flow through an ecosystem

**Click here** to see energy flow through an ecosystem

  • Green plants (producers) make up the 1st trophic level
  • Herbivores make up the 2nd trophic level
  • Carnivores make up the 3rd and 4th trophic levels.
**Click here** to see another picture showing energy flow through an ecosystem

  • Each consumer depends on the trophic level below them for energy
  • 90% of energy is lost from one trophic level to the next