1. Energy Flow Through an Ecosystem
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What is energy?
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What is energy?
- Energy is the ability to cause some kind of change.
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Photosynthesis
Changes light energy into chemical energy in the form of glucose.
ENERGY is stored in glucose
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Photosynthesis
-Occurs in the chloroplasts of plants. -Chloroplasts contain chlorophyll. -Chlorophyll is the pigment that makes plants look green.
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6. Chemical equation: Photosynthesis
6CO2 + 6H2O + sunlight C6H12O6 + 6O2
Carbon dioxide + water sunlight
Glucose (sugar) + oxygen
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Organisms that can make glucose during photosynthesis are called PRODUCERS.
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8. Producers use most of the energy they make for themselves.
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CELLULAR RESPIRATION is when organisms use oxygen to break down food to get energy for cells.
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10. Chemical equation : cellular respiration
6O2 + C6H12O6 -->  6H2O + 6CO2 + energy
Oxygen + Glucose
Carbon dioxide + water Energy (ATP)
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Did you notice a pattern with the chemical equations and if you did, what was it?
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The energy that is not used by producers can be passed on to organisms that cannot make their own energy.
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13. Organisms that cannot make their own energy are called CONSUMERS.
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ENERGY PYRAMID - a diagram that shows the energy flow in an ecosystem. Trophic levels - the different feeding levels of organisms
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15. Which level do you think has the most energy?
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16. Secondary Consumers= CARNIVORE Primary Consumers= HERBIVORES
Tertiary Consumers
Secondary Consumers= CARNIVORE
Primary Consumers= HERBIVORES
PRODUCERS
Remember scavengers and decomposers can enter at any level!

17. Consumers that eat producers to get energy:
Are first order (1st) or primary consumers
Are herbivores (plant-eaters)
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Most of the energy the primary consumer gets from the producer is used by the consumer.
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19. Some of the energy moves into the atmosphere as heat.
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Some energy in the primary consumer is STORED & not lost to the atmosphere or used by the consumer itself. This energy is available for another consumer (predator).
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21. A Consumer that Eats Another Consumer for Energy:
Is called a secondary or 2nd order consumer
May be a carnivore or a omnivore
May be a predator
May be a scavenger
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22. A consumer that eats a consumer that already ate a consumer:
Is called a 3rd order or tertiary consumer
May be a carnivore or a omnivore
May be a predator
May be a scavenger
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23. Consumers that eat producers & other consumers
Are called omnivores
Omnivores eat plants and animals
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Consumers that hunt & kill other consumers are called predators. The animals that are hunted & killed are called prey.
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25. Consumers that eat other dead consumers are called scavengers
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Energy Pyramids Show
Amount of available energy decreases for higher consumers
It takes a large number of producers to support a small number of primary consumers
It takes a large number of primary consumers to support a small number of secondary consumers
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Food chain – the flow of energy of one organism eating another organism *A single pathway*
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28. Food Chains Show Available Energy
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More Food Chains
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30. Food webs –the pattern of overlapping food chains
They show the feeding relationships in an ecosystem
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31. Identify the Producers, Consumers, & Decomposers:
Count the Food Chains!
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32. How Many Chains are in this web? copyright cmassengale