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Unformatted text preview: 67 J is used for cellular respiration This energy is lost as heat Efficiency measure Production efficiency = net secondary production / assimilation of primary production Fraction of food energy that is not used for respiration, or energy that is not lost to the environment Our example production efficiency = 33 J (growth) / 33 + 67 J (energy used for assimilation, feces dont count) = 33%...
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- Spring '10