section14

section14 - MIT Department of Biology 7.014 Introductory...

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MIT Department of Biology 7.014 Introductory Biology, Spring 2005 Recitation Section 14 March 30-31, 2005 Biogeochemical Cycles—Energy Flows A. Carbon and Energy in a Food Web. Steady State. Plants Herbivore R A P gross 1 2 P B R H 6 R H 11 Carnivore 4 I A P 8 10 I A P 3 F 13 F B D B D D 7 9 12 5 B = biomass D = detritus F = feces I = ingestion A = assimilation P = production R = respiration Detritivore R 14 H I = A + F B A = R + P D 15 16 1. What do the arrows in the diagram represent? 2. Why are the arrows of different sizes? 3. How does the energy enter the ecosystem? Is it converted in any way before it is used in the ecosystem? 4. What do each of the following numbers represent? 1 = 2 = 3 = 4 5 = 6 = 7 = 8 9 = 1 0 11 = 1 13 = 1 15 = 1 6 1
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5. Starting with 10 6 kcal/yr of GPP and given the following values, estimate the values of each of the flows from part 4 assuming steady-state conditions. NPP For plants : net production efficiency = = 50% GPP For the herbivores: exploitation efficiency = ingestion = 20% production from previous trophic level assimilation
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section14 - MIT Department of Biology 7.014 Introductory...

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