1. Energy Flow Through an Ecosystem

2. Energy Flow Starts with the Sun
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3. Carbon Dioxide + Water + Sunlight 
Photosynthesis
Producers use the Sun’s energy to create food
Chemical reaction
Produces the sugar glucose
Equation for photosynthesis:
Carbon Dioxide + Water + Sunlight 
Sugar + Oxygen

4. Organisms that can make glucose during photosynthesis are called PRODUCERS.

5. Producers use most of the energy they make for themselves.

6. Producers use cellular respiration to supply the energy they need to live.

7. Carbon Dioxide + Water + Energy
CELLULAR RESPIRATION is the chemical reaction that releases the energy in glucose.
Oxygen + Glucose 
Carbon Dioxide + Water + Energy

8. The energy that is not used by producers can be passed on to organisms that cannot make their own energy.

9. Organisms that cannot make their own energy are called CONSUMERS.

10. Consumers that eat producers to get energy:
Primary consumers
Herbivores (plant-eaters)

11. Only 10% of the energy available can be used by the next feeding level.

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Most of the energy is used by the organism to survive.
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14. Some of the energy moves into the atmosphere as heat.

15. Some energy is STORED in the organism
Some energy is STORED in the organism. This energy is available for another consumer (predator).

16. A Consumer that Eats Another Consumer for Energy:
Is called a secondary consumer
May be a carnivore or an omnivore
May be a predator
May be a scavenger or decomposer

17. A consumer that eats a consumer that already ate a consumer:
Is called tertiary consumer
May be a carnivore or an omnivore
May be a predator
May be a scavenger

18. Consumers that eat producers & other consumers
Are called omnivores
Omnivores eat plants and animals

19. Consumers that hunt & kill other consumers are called predators
Consumers that hunt & kill other consumers are called predators. The animals that are hunted & killed are called prey.

20. Consumers that eat other dead consumers are called scavengers

21. We already know Food Chains

22. Another way of showing the transfer of energy in an ecosystem is the ENERGY PYRAMID

23. Energy Pyramids Show
Amount of available energy decreases down the food chain
It takes a large number of producers to support a small number of primary consumers

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Trophic Levels
Different feeding levels
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25. Food Webs Interconnected food chains
Show the feeding relationships in an ecosystem

26. How Many Chains are in this web?

27. Identify the Producers, Consumers, & Decomposers:
Count the Food Chains!