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For growth and energy to live, move, and repair themselves.
On an ecological pyramid or in a food chain, typically, the highest trophic levels have the least amount of energy from the sun available for the next highest level. In a typical food chain, this would be the tertiary consumer level.
respiration, movement, and reproduction.
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.
At each trophic level in a food chain, a large portion of the energy is utilized for the maintenance of organisms which occur at that trophic level and lost as heat. As a result of this, organisms in each trophic level pass on less and less energy to the next trophic levels, than they receive.
Trophic level
It used by the organisms at each trophic level to keep themselves alive.
The trophic level of producers (photosynthetic organisms) has the most available energy in a biologic community. As a general (but not absolute) rule, every trophic level above this has 10% as much available energy as the level below it; primary consumers have 10% as much as producers, secondary consumers 1%, tertiary consumers .1%.
Trophic Level
ten percent
This is because energy is lost at each trophic level. The energy available to the next trophic level is about 10% of the energy of the previous trophic level.