energy pyramid lesson
TRANSCRIPT
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11-29-16 WARM UP 1. Which organism represents the primary consumer?
2. Which organism represents the secondary consumer?
3. What do the mushrooms and rotting log represent?
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ENERGY PYRAMIDS
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Food chains do not typically go past 4 or 5 trophic levels
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Why?
Energy cannot be created or destroyedEvery time energy is transferred, some of that energy is lost
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On average, about 90% of the energy is “lost”- only 10% moves to the next trophic level
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WHY ONLY 10%?1. Not everything gets eaten
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2. There is still some potential energy in animal waste
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3. Each energy conversion releases heat (a type of energy) to the environment
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New energy is always being added to the food chain by the Sun
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ENERGY PYRAMIDSThey show how energy is lost at each stage of a food web
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In an energy pyramid:
•Producers are at the bottom, because they have the most available energy. (They got it right from the source)
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The next level is the primary consumers. They got 10% of the energy in the plants.
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The next level is the secondary consumers. They got 10% of the energy in the primary consumers.
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ENERGY PYRAMID PRACTICE
If there is 10,000 kcal of energy available in the plants at the bottom of the pyramid, how much energy will make it to the zebras, and how much will make it to the lion?
10,000
1000
100
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An energy Pyramid
Gets smaller as it goes up since there is less and less energy as you go up
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Pyramid of biomass
How much everything weighs at each level
Always pyramid shaped
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Pyramid of numbers
How many organisms are at each level
Usually mostly producers, then primary consumers, then secondary and so on
100,000 plants
1000 voles
1 owl
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Pyramid of numbers
Could look like this:
1 oak tree supports lots of primary consumers, which support fewer secondary consumers, then even fewer tertiary, etc.
1 oak tree
1000 caterpillars
50 bluetits
1 sparrow hawk
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ENERGY PYRAMID ACTIVITY
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DIRECTIONS: CUT WHEN FINISHED AND TAPE
WHAT DOES AN ENERGY PYRAMID REPRESENT?
•Use complete sentences
•Write 3 factsCONSTRUCT A TERRESTRIAL ENERGY PYRAMID WITH 4 TROPHIC LEVELS•Draw, Color, Label
CONSTRUCT AN AQUATIC ENERGY PYRAMID WITH 5 TROPHIC LEVELS
•Draw, Color, Label
1.
5.
4.
3.
2.
PLACE ON THE COUNTER
THINK ABOUT YOUR FOOD CHAIN BEFORE MAKING YOUR PYRAMID