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Unformatted text preview: Secondary: heterotrophs consume other organisms to make biomass Primary versus secondary production: Gross production total biomass produced Net production biomass remaining after respiration respiration use of biomass to release energy to maintain cells Net Production = Gross Production - Respiration Example: human body - no weight gain means no net production most of energy released as heat during respiration Energy efficiencies: efficiency ratio of output to input amount of useful work obtained from a given amount of energy % efficiency = energy out x 100 energy in trophic level efficiency (food chain efficiency) - between trophic levels production level n x 100 production level n-1 growth efficiency how efficient organisms are at converting food to biomass within a trophic level production x 100 consumption no units, always < 100%...
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- Fall '04