- 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.
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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