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EACH OF THE ORGANISMS IN AN ECOSYSTEM FILLS ONE OF 3 ENERY ROLES. THE 3 ENERGY ROLES ARE __________, _____________, and ____________
- 1. Producer
- 2. Consumer
- 3. Decomposer
- (Peter can dance)
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PRODUCER
An organism that can make its own food
Example: Oak Tree
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CONSUMER
An organism that obtains energy by feeding on other organisms
Example: Bird, fox, owl
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HERBIVORE
Consumers that eat only plants
Example: Rabbit, grasshopper
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CARNIVORE
Consumers that eat only animals
Example: Lion, spider
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OMNIVORE
Consumers that eat both plants and animals
Example: Humans, crows, bears
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SCAVENGER
A carnivore that feeds on the bodies of dead organisms
Example: Catfish, vultures
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DECOMPOSERS
Break down wastes and dead organisms and return the raw materials to the ecosystem
Example: Mushrooms, bacteria
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WHAT ARE TWO WAYS IN WHICH MOVEMENT OF ENERGY THROUGH AN ECOSYSTEM CAN BE SHOWN?
1. Food Chain
2. Food Web
(Frank can find water)
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FOOD CHAIN
Series of events in which one organism eats another and obtains energy
Example: Grass---Mouse---Snake---Fox
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FOOD WEB
Consists of many overlapping food chains in an ecosystem
- Example: Grass---Grasshopper---Shrew---Fox
- Combined with the food chain
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ENERGY PYRAMID
A diagram that shows the amount of energy that moves from one feeding level to another food web
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WHERE IS THE MOST ENERGY AVAILABLE IN THE ENERGY PYRAMID?
Producer Level
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AS YOU MOVE UP IN THE ENERGY PYRAMID, EACH LEVEL HAS _____ ENERGY AVAILABLE THAN THE LEVEL BELOW
Less
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HOW DOES AN ENERGY PYRAMID GET ITS NAME?
From the shape of the diagram--- wider at the base, narrower at the top
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IN GENERAL, ONLY ABOUT ___% OF THE ENERGY AT ONE LEVEL OF A FOOD WEB IS TRANSFERRED TO THE NEXT HIGHEST LEVEL
10%
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WHY IS A FOOD WEB A MORE REALISTIC WAY OF PORTRAYING AN ECOSYSTEM THAN A FOOD CHAIN?
The amount of energy available on one level of the energy pyramid is 10 times greater than that available at the next level up
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WHY ARE THERE USUALLY FEW ORGANISMS AT THE TOP OF THE ENERGY PYRAMID?
Because so much energy is lost from one level to the next level up, the energy available at the top level can support few organisms
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