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Biology
Ecology and the environment
8.6 - Pyramids of biomass
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Mary Fox
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Cards (9)
Biomass
The mass of living organisms in a given area
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What does each bar in a pyramid of biomass represent?
The biomass of all organisms in that trophic level
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What happens as you go up the bars?
The bars get smaller.
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Why do the bars get smaller as they go up?
Because the total mass of the organisms is decreasing
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How much energy and biomass is transferred up to the next trophic level?
10%
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What does the biomass of an organism refer to?
The mass of an organism
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Where are apex predators on a pyramid of biomass?
At the top of the pyramid
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Give three reasons why only ~10% of the energy & biomass is passed on at each stage in a food chain?
- Organisms don't normally eat every part of their food (e.g. rabbits may not eat the roots of the grass they eat)
- Some of the material they eat may not be absorbed (e.g. rabbits may not be able to digest all the cellulose in grass)
- Most of the biomass/energy that is absorbed is used to release energy (via respiration) for movement etc.
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What is the formula for efficiency of biomass transfer?
Biomass in current trophic level / biomass available in previous level X 100
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