1. Energy is involved in every activity on Earth
ENERGY in ECOSYSTEMS
Energy is involved in every activity on Earth

2. Energy in Ecosystems (p.38)
Earth

3. Energy in Ecosystems (p.38)
Earth
Matter  - "recycles"
All energy originates from the SUN!
Energy  -  "flows through"
30%
reflected
greenhouse gases
19%
heats atmosphere and surface
51%
Absorbed by land and water
0.023%
used by PLANTS to produce FOOD

4. Photosynthesis and Cellular Respiration

5. Photosynthesis:
transforms light energy (sun) into chemical energy (glucose)
Done by producers (like plants)
light energy + carbon dioxide + water → glucose oxygen

6. Cellular Respiration:
transforms chemical energy (glucose) into useable energy
Done by most living things (like us!)
glucose oxygen → carbon dioxide + water + useable energy

7. Complementary Processes!! (they support one another!)
Photosynthesis
C6H12O O2
6 CO H2O + energy
Carbon Dioxide + Water + Energy Glucose + Oxygen
Cellular Respiration

8. Food Chains and Food Webs (p.42)
The flow of energy involves interactions between many living things:
Producer: (autotroph)
gets energy by making its own food

9. CONSUMERS (HETEROTROPHS)
Herbivore: gets energy by eating producers
Omnivore: gets energy by eating
producers and consumers
Carnivore: gets energy by eating consumers
Decomposer: gets energy by eating waste/dead (saprovore)

10. Food Chain P. 43
a straight chain model that describes how energy is passed from one living thing to another (one path)

11. Food Web (p.45)
a complex model that describes how energy in an ecosystem is transferred through two or more interconnected food chains (many paths)
Do workbook p.18:
Food chains and Food webs

12. Energy Transfer (Trophic Levels) p.44
only a small amount (10%) of the energy transferred is available for the next trophic level  because most of the energy is used by organisms to live.   (see fig.1.6B  p.24)
Secondary Consumers
Primary Consumers
10%
Producers

14. Use the food web provided to answer the following questions
1. List the producers/autotrophs
 2. Identify a herbivore ________________________
3. What type of animal is a snake?
4. What is the role of bacteria?
 5. If rabbits were removed from this food web, how would it effect:
a) Shrubs ____________________
b) Mountain lion __________________
c) Grasshopper ____________________
d) Shrew _________________________

15. Questions:
P. 41 # 1-5
P. 47 # 1-5

16. REVIEW
10 minutes