The energy pyramids represent the energy stored in each trophic level at a certain time and that is available to the higher level. These pyramids are the ones that provide the greatest amount of information about the ecosystem.
They are usually expressed in units of energy per unit area or volume and per unit of time, such as g / m 2 .year, cal / m 2 .year, etc.).
The energy transfer from one level to another is approximately 10%. Much of the energy is used for metabolism .
These pyramids can never be inverted , since the energy of the lower trophic level always has to be greater than that of the upper level.
Interactive activity: Pyramids of energy.
The biomass pyramids represent the amount of biom handle ( organic matter alive or dead) of any trophic level .
It is measured in grams or kilograms of organic matter per unit area or volume. For example, g/m2, kg/ha, etc.
In number pyramids, each bar represents the number of individuals at each trophic level. Generally, the number of individuals decreases in the upper levels, but we can also find inverted pyramids, such as the numerous aphids that feed on a rose bush. Therefore, this information does not provide much information about the real importance of each organism in the ecosystem.
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