pyramids of biomass and numbers
- Created by: bethreeves
- Created on: 18-09-14 18:20
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- Biomass and Numbers
- Biomass pyramids are almost always pyramid shaped because biomass is lost at each stage in the food chain.
- To construct a pyramid of biomass you use the dry biomass of the organisms.
- You dry out all the water from the organism before weighing.
- Measuring dry biomass can be difficult because you have to kill the organism to work it out.
- It can be difficult to construct an accurate pyramid of biomass because some organisms feed at more than one trophic level.
- Each bar on a pyramid of numbers show the number of organisms at that stage of the food chain, not their mass.
- pyramids of numbers can be other shapes.
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