A trophic level's stored biomass typically only transmits around 10% of its total energy to the next level, on average.
At each trophic level of an ecosystem, the concentration of energy decreases as it moves up the food chain. Energy transfer rates between trophic levels can be as low as 10%, with most of the remaining energy being lost as heat during metabolic processes.
Only 10% of energy is transferred from one trophic level to the next, according to the 10% rule. Therefore, if producers store 10,000 J of energy through photosynthesis, only 1000 J will be transferred to primary consumers.
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