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Net Production of Consumers

AQA A-level BiologyEnergy and EcosystemsLesson 9 of 14

Consumers also lose much of the chemical energy they take in. Their net production (the energy stored in their new biomass) is calculated from:

N = I − (F + R)

where:
• N is the net production of the consumer;
• I is the chemical energy store in ingested food;
• F is the chemical energy lost to the environment in faeces and urine;
• R is the respiratory losses to the environment.

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Key terms in this lesson

ectotherm
An organism that relies mainly on external sources of heat to regulate its body temperature.
endotherm
An organism that can generate and retain heat metabolically to maintain a fairly constant core body temperature.

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