1. EOC Catalyst #6
March 27, 2012

2. Announcements
Unit 8 Test make-up
Tutoring: Today

3. Objectives
SWBAT explain the relationships depicted by a food chain/web
SWBAT interpret a food chain/web in order to identify the members representing each trophic level in the ecosystem

4. Food Chain
Model showing energy flow through an ecosystem

5. Basic Food Chain Arrows show the movement of energy
In this example energy flows from the sun to the plants to the rabbit to the owl.
Identify the producer (s)/autotroph(s)
Identify consumer(s)/heterotroph(s)
Carnivores? Herbivores?

6. Basic Food Chain Scorpion Bullfrog
In the above picture, which animal eats the other?
How do you know that?

7. Food Chains vs. Food Webs

8. Food Web
A food web represents the many interconnected food chains of energy flow

10. Trophic Levels Each step on a food chain/web
Autotrophs make up first level; heterotrophs remaining levels
Organisms at each level get energy from the tropic level before it (except autotrophs)
Primary producers
Primary consumer
Tertiary consumer
Quaternary consumer

11. CFU check:
What are the primary producers?
What are tertiary consumers?
Name the quarternary consumers.
What are the autotrophs in this food web?