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Food Chains Food Chains and and
Food WebsFood Webs
How energy moves in an ecosystemHow energy moves in an ecosystem
OROR
who eats who!?who eats who!?
Organisms need this energy to live.
Energy moves through an ecosystem when one organism eats another organism.
This keeps the ecosystem going.
This energy pyramid is one way to show how energy This energy pyramid is one way to show how energy moves. Producers are always at the bottom of the energy moves. Producers are always at the bottom of the energy
pyramid because they are the first things eaten. Notice pyramid because they are the first things eaten. Notice that the amount of energy is lost, or decreases, as more that the amount of energy is lost, or decreases, as more
organisms eat each other. organisms eat each other.
Food Chain: A food chain shows one path of how energy moves through an ecosystem (who-eats-who).
Food Web: A food web shows many paths of how energy moves through an ecosystem (who-eats-who). A food web is made up of many different food chains.
Food ChainFood ChainRemember: Remember: Arrows are used to show Arrows are used to show
where the energy is where the energy is going.
Food WebFood Web Remember: Remember: Arrows are used to show Arrows are used to show
where the energy is where the energy is going.
Turn to you partner and tell them everything you know about food chains and food
webs and what they show us about an ecosystem.
You could have mentioned that:
1. It shows use the way energy moves in an ecosystem.
2. It shows us who-eats-who in an ecosystem.
3. It is made up of producers, consumers and decomposers.
4. Arrows are used to show where the energy is moving.
5. ……?
You could have said that:
1. A food chain shows one way energy moves in an ecosystem but a food web shows many ways energy moves.
2. A food web is made up of many different food chains.
DrawDraw your own your own food web food web with the following organisms:with the following organisms:
( Don’t forget to include arrows and remember that ( Don’t forget to include arrows and remember that
arrows show where the energy is moving.)arrows show where the energy is moving.)
Mouse
Fox
Owl
Snake
Berries
Rabbit
Squirrel
Leaves
Grasshopper
Frog