pyramids of biomass and numbers

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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.




Well constructed mind map, thank you

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