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Pyramid of Biomass

  • This pyramid overcomes the shortcomings of pyramid of numbers (size difference problem)
  • It weighs the organism of each trophic level instead of counting.
  • It gives us the total dry weight of all organism at each trophic level.
  • Biomass is measured in g/m2.

NOTE- UPRIGHT-
1. GRASSLAND-BIOMASS
2. ENERGY
3. NUMBERS- Grassland, Pond

a) Upward pyramid

  •  It also has large base of primary producers with smaller trophic level at top.
  • Producer’s biomass is maximum.
  • Next trophic level biomass – i.e. primary producer’s biomass is less than the primary consumers and same is true for subsequent higher levels.
  • The top trophic level has very less amount of biomass.

 

b) Inverted pyramid

  • This kind of pyramid is found in many aquatic ecosystems.
  • Reason – producers are tiny phytoplanktons that grow and reproduce rapidly.
  • The base of the pyramid is small while the top is larger showing biomass is increasing from bottom to top and so pyramid assumes inverted shape.
     

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