In a field with 10,000 calories of net primary productivity, a main consumer will typically have access to 1000 calories.
The difference between the quantity of carbon generated through photosynthesis (GPP) and the quantity of energy consumed for respiration is the amount of carbon stored in an ecosystem (growth in biomass) (R).
The volume of biomass that consumers in an ecosystem might have access to. It is expressed as a mass or energy unit per unit of area and time.
The amount of energy that is transported through one trophic level to the next is just about 10%. Just 10% of the energy created by the producers, who create everything, is transferred to the primary consumer.
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