Lecture 11 Eco2B

Lecture 11 Eco2B - 2/24/09 Overview - Ecosystem Ecology...

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2/24/09 1 Next week (week of March 2 – 6) bring a calculator to discussion section Overview - Ecosystem Ecology I. Energy flows A. Primary production 1. marine 2. freshwater 3. terrestrial B. Secondary production 1. production efficiency 2. trophic efficiency II. Why is the world green? III. Nutrient cycles: water, C, N, P IV. Hubbard Brook Review trophic structure the feeding relationships between organisms in a community Secondary Production All the growth and reproduction by consumers When a caterpillar feeds on a plant leaf – Only about one-sixth of the energy in the leaf is used for secondary production (new growth) Plant material eaten by caterpil ar Cel ular respiration Growth (new biomass) Feces 100 J 33 J 200 J 67 J
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2/24/09 2 1. Production Efficiency fraction of assimilated energy (food) that is used for secondary production = energy for biomass (2ndary production) energy for biomass + cellular respiration Production efficiencies Birds, mammals 1-3% (endotherms) Fish 10% (ectotherms)
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This note was uploaded on 04/29/2009 for the course BILD BILD 2 taught by Professor Schroeder during the Spring '08 term at UCSD.

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Lecture 11 Eco2B - 2/24/09 Overview - Ecosystem Ecology...

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