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Food Chains and Food Webs

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by

Wendy Keenum

on 5 May 2014

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Transcript of Food Chains and Food Webs

Food Chains and Food Webs
Food CHAINS
A food chain is a model used to show how energy is obtained through each organism.....
Which do you think is more realistic to use????
FOOD WEB
EXAMPLE
LEVELS IN A FOOD WEB
1.
PRODUCERS or AUTOTROPHS

2.
PRIMARY CONSUMERS or
FIRST ORDER HETEROTROPHS

3. SECONDARY CONSUMERS or
SECOND ORDER HETEROTROPHS

4. TERTIARY CONSUMERS or
THIRD ORDER HETEROTROPHS
it shows ONE path which energy moves through the ecosystem
Food WEB
A food web shows how a food chain can OVERLAP in an ecosystem
We know that many animals eat each other...This is how food chains OVERLAP....
A food chain or food web????
FOOD WEBS ARE MORE REALISTIC!!!
WHY????
BECAUSE MANY ORGANISMS PLAY DIFFERENT ROLES IN AN ECOSYSTEM!!!
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