food chains & food webs science 10 ms. lowrie. food chains show the flow of energy through an...
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Food Chains & Food Webs
Science 10Ms. Lowrie
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Food Chains
Show the flow of energy through an ecosystem
Linear pictures of how energy moves (is transferred) from one organism to the next
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Food Chains
Notes:All food chains start with a producer (a plant)
Arrows point in the direction of energy flow Not who eats who
Ex: algae fish bear
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Examples of food chains:1. Lichen Snail Toad Bird
2. Wild Berries Field Mouse Fox
3. Phytoplankton Zooplankton Salmon Eagle
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Activity – You & Food Chains
Think about what you last ate. Whatever it was, its main ingredients
were once part of living organisms Plant matter in was made by plants, using
sunlight, carbon dioxide, water, nutrients in soil Animal matter was made from items the animal
ate (plants, animals, or both) By eating, you become another link in this chain
of life!
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You In a Food Web
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Activity – You & Food Chains
1. List all food eaten in your last 2 meals For processed foods, list all ingredients that
come from living things
2. Organize the items from #1 into a t-chartPlant Matter Animal Matter
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-(includes eggs, milk, butter & cheese)
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Activity – You & Food Chains
3. Identify all items under the ‘Animal Matter’ column as either a(n):
Herbivore Omnivore Carnivore
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Activity – You & Food Chains
4. Create three food chains to which you are linked.
Use ideas from the data in your chart. Food Chain 1:
Food Chain 2:
Food Chain 3:
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Activity – You & Food Chains
Answer the following questions: Brainstorm answers with your table
1. What kinds of organisms are at the start of every food chain?
2. Do any of your food chains have more than three links? Suggest a reason why or why not.
3. For what species might you become a source of food? When or why might this happen?
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You In a Food Web
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Food Web
Show interactions among food chains
Most animals:eat more than one
type of foodare eaten by more
than one predatorare part of more than one food chain
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Activity – Creating Food Chains
Task: Create 3
different food chains from the food web
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Trophic Levels
Positions in a food chain Depends on number of organisms
1st trophic level = producer 2nd trophic level = primary (1º) consumer 3rd trophic level = secondary (2º) consumer
Etc …
Last tropic level = largest omnivore / top carnivore
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Trophic Levels:
Example
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Trophic Levels:
Examples
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Example (please copy)
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Energy Flow Less energy
available to pass to next trophic levelMore ‘links’
= less energyUsually 10%
available
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The 10% Rule
About 10% of energy:Stored in tissuesAvailable to be transferred when eaten
Other 90% is used for growth, reproduction or released to environment
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Energy Loss (please copy)
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Any questions?