Secondary Production in Ecosystems

Secondary Production in Ecosystems - 67 J is used for...

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1/31/11 Secondary Production in Ecosystems Amount of chemical energy in food converted into organic matter Cow eats grass – secondary production is the amount of grass that is converted into cow The cow does not use the entire grass, some of it passes through the digestive system
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1/31/11 Production Efficiency Example of a caterpillar Eats 200 J of plant material 33 J is used for growth 100 J passes through the caterpillar as feces Not lost energy because decomposers will use this energy
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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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Secondary Production in Ecosystems - 67 J is used for...

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