Following are the three types of ecological pyramids: -
- Pyramid of Numbers: It is arranged from the lower trophic levels at the bottom to higher trophic levels above and shows the number of individuals at each level. Mostly, these pyramids have a wider base (higher producer population).
- Pyramid of Biomass: It is arranged from the lower trophic levels at the bottom to higher trophic levels above and shows the biomass (dry weight) at each level. Mostly, these pyramids have a wider base (higher producer population).
- Pyramid of Energy: It is arranged from the lower trophic levels at the bottom to higher trophic levels above and shows the energy consumed at each level. These pyramids have a wider base. Unlike the other pyramids, this can never have an inverted shape
In all pyramids, a particular trophic level represents a functional level and an organism may be present at more than a single level. Energy always flows from prey to predator and the availability of energy reduces at subsequent levels.
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