1.Where did these acorns come from? 2.What kind of animal might eat these? 3.What kind of animal...
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1. Where did these acorns come from? 2. What kind of animal might eat these? 3. What kind of animal might eat the animal that ate the acorns? 4. What was the original source of energy in the food chain? Intro 5/2/12
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Transcript of 1.Where did these acorns come from? 2.What kind of animal might eat these? 3.What kind of animal...
1. Where did these acorns come from?
2. What kind of animal might eat these?
3. What kind of animal might eat the animal that ate the acorns?
4. What was the original source of energy in the food chain?
Intro 5/2/12
Food Web
• A diagram that shows all the possible food chains in an ecosystem.
• Same rules apply to food webs that apply to food chains.
Add this on to yesterday’s notes!
Ecological Pyramids: Diagrams that show how energy flows
through ecosystems
Food chains will usually be no longer than 5 trophic levels.
Not all the energy that is stored in one level is passed on to the next level.
After the energy enters the body of an animal, it is used up for life processes:
• Respiration• Movement• Growth
Pyramid of Energy:• Shows the amount of available energy at each
trophic level.10% Rule
Only about 10% of the total energy is transferred from one level to the next.
Pyramid of Numbers:• Shows that population size decreases at each
higher trophic level.
Think about it… Smaller organisms
tend to be present in larger quantities!
Pyramid of Biomass:• The total weight of living matter at each trophic
level.
Food for thought…If our species continues to
overcrowd its means, what will happen to the available
resources at the bottom of the pyramid?
Halloween StoryYou were walking home from trick-
or-treating with a mouth full of candy when a land shark came out of nowhere… and ate you!
How much of the energy from the candy does the
land shark get?Candy Serving Size
Calories/servingWhoppers 6 180Reeses 1 90Hersheys 3 200Kit-Kat 3 210Butterfinger 2 170Starburst 4 160
HW:
C#2
5/3/12
Food Webs Game
Today: Swamp Food Web Lab• Packet contains
– Organism cards– Information sheet– Chalk
• Steps1. Make a food chain using 4 cards.
2. Draw arrows using chalk
3. Add more organisms to show more feeding relationships (make a food web)
4. Try to use every card in your deck!
5. Show Mrs. G your finished food web to get your points!
• CLEAN-UP– Wet a paper towel and erase your table!– A dirty table will result in points off your lab!
