10Biogeography306

10Biogeography306 - Biogeography I. I. Energy Flow in...

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1 1 Biogeography I. Energy Flow in Ecosystems I. Food Chains, Trophic Levels II. Nutrient Cycling III. Interactions Among Species IV. Human Impacts on the Biosphere 2 Energy Flow in Ecosystems Energy for the biosphere comes from the sun. Photosynthesis: sun’s energy captured by green plants. 3 Energy Flow in Ecosystems Some organisms are chemosynthetic. http://life.bio.sunysb.edu/marinebio/hotvent.html 4 6CO 2 + 12 H 2 O Photosynthesis 6H 2 O + C 6 H 12 O 6 + 6 O 2 5 Energy Flow in Ecosystems Carbohydrates store energy in chemical bonds. 6 Energy Flow in Ecosystems • Some stored energy used by plants • Some available to herbivores • Stored energy released in respiration 7 Food Chains Green plants are primary producers (autotrophs). Herbivores eat plants. Carnivores eat meat. Each of these is a trophic (feeding) level. 8 Energy Flow in Ecosystems 9
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2 10 Energy Flow in Ecosystems About 10% of the energy in one trophic level is passed on to the next trophic level. About 90% of the energy is lost as heat. 11 Laws of Thermodynamics 1. Energy is neither created nor destroyed 2. Every time energy is transformed, potential energy is lost 12 13 Food Web 14 Energy Flow in Ecosystems Biomass: total mass of living material. 15
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This note was uploaded on 04/21/2008 for the course GEOL 101 taught by Professor Jeeze during the Winter '08 term at San Diego State.

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10Biogeography306 - Biogeography I. I. Energy Flow in...

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