its because that all the organisms get fit in one place.
gfs
The higher you are on the pyramid the less energy you get, so it takes a lot of stamina and endurance to be at the top.
The most energy is available at the producer level of the pyramid . As you move up the pyramid, each level has less energy available than the level below.
The number of higher-level consumers (higher in the pyramid) usually decreases, as they typically consume more than one prey.
The higher an organism is in the energy pryamid the less energy. the lower the organism`s posittion in the pyramid more energy
The energy transferred from each tier of the energy pyramid gradually decreases the higher up you go because as energy is being transferred, larger and/or higher consuming organisms are using up more energy. Again, this increases the higher up you go.
The higher the pyramid gets the less energy each level receives so you get 10%at each level that the energy is consumed
between each tier of the energy pyramid, energy is lost as heat
Because only a fraction of the energy used by a level is converted to biomass, less energy is available at higher levels.
The biomass of each organism decreases with each level. With less energy at higher trophic levels, there are usually fewer organisms as well. Organisms tend to be larger in size at higher trophic levels, but their smaller numbers result in less biomass. Biomass is the total mass of organisms at a trophic level.
There are more animals on lower energy levels because only 10% of energy is passed on up to the next level, meaning there has to be more organisms on lower levels to sustain life on higher levels.
Because only a fraction of the energy used by a level is converted to biomass, less energy is available at higher levels.
Energy must be transformed within ecosystems so that it is made available to other organisms. Energy is produced by producing organisms at the lowest trophic level, and then moves up to higher trophic levels to other consuming organisms.