the 10% rule - mrs. papay's classroom · represents the energy available for each trophic...
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Skill Development Ecological Pyramids
• are models that show how energy flows through ecosystems
click to watch a video clip
What observations can you make about this pyramid?
Skill Dev. Types of Pyramids
Pyramids can show the relative amounts of energy, biomass, or numbers of organisms at each trophic level in an ecosystem.
click on each image to learn more
Skill Dev. Energy Pyramids
With each level of the pyramid, only 10% of the energy available is used by organisms (there is an energy loss of about 90% to the environment)
represents the energy available for each trophic level in an ecosystem
The 10% Ruleclick here
the total amount of energy available at each level decreases in an ecosystem
Diagram
Diagram
Skill Dev. Think About it
Diagram
Diagram
Why do developing countries feed their people with grains instead of meat?
Skill Dev. Number Pyramids
the total numbers of individual organisms tend to decline as one goes up trophic levels
click hereclick here
represents the number of individual organisms available for energy at each trophic level
Skill Dev. Biomass Pyramids
represents the total mass of living organic matter (biomass) at each trophic level
since the number of organisms is reduced in each trophic level, the biomass is reduced too
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