TrophicLevels


 * 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

[[http://sparkleberrysprings.com/v-web/b2/images/t/trophic2c.png|
 * 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