1. Section 3.3 Energy Flow in Ecosystems

2. DO NOW
REBUS PUZZLES ON THE BOARD

3. Last Night’s homework Read Section 3.3 and define: Food chain
Phytoplankton
Food web
Zooplankton
Trophic level
Ecological pyramid
Biomass

4. Homework
Pg. 78
Answer questions 1a, 1b, 2a & 2b in the Section 3.3 Assessment

5. Primary producers – give an example?
REVIEW
Primary producers – give an example?
Grass, trees, bushes – anything that produces its own food. Typically through photosynthesis.
Known as Autotrophs
Store energy in forms that other organisms can use when eaten

6. Consumers aka Heterotrophs
REVIEW
Consumers aka Heterotrophs
You are one, you rely on eating off of something else even if you are a vegetarian.
Some are specialized – Lions only eat meat. Others are generalized – bears can eat fish or plants / berries.

7. Chemosynthesis with equation
REVIEW
Chemosynthesis with equation

8. NEW MATERIAL
FOOD CHAIN – series of steps in which organisms transfer energy by eating and being eaten.
Primary Producer  Herbivore  Carnivore (pg. 73)
FOOD WEB – Network of feeding interactions
Herbivores graze on different types of grass
Carnivores feed on different herbivores (pg. 74)

9. FOOD CHAINS One-way stream Food chains vary in length
Primary producer  various consumers
Food chains vary in length
As little as 2 steps but could be much larger

10. ACTIVITY! Find a partner
Write a story starting from a primary producer.
The story should be written so that there are at least 3 animals involved
Trade stories with partner and partner draws the food chain at the bottom of the page
Most creative story wins a prize

11. Food web More complex than a single, simple chain
Herbivores graze on several types of grasses, and carnivores or omnivores eat herbivores.
Why are food chains a more accurate representation of the feeding relationship?

12. Homework
Pg. 78
Answer questions 1a, 1b, 2a & 2b in the Section 3.3 Assessment