1202L20 - 0. 1. 2. 3. Chapter 55 - Ecosystems Understand...

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Chapter 55 - Ecosystems 0. Understand what limits production 1. Understand energy flow and how to calculate production and ecological efficiencies 2. Know major biogeochemical cycles and how man has modified them 3. Understand what causes acid rain and ozone depletion Figure 55.4 An overview of ecosystem dynamics Food Chain Models 4. About 1 % of solar energy is trapped by plants for primary production (gC/m 2 /yr) 5. About 10% transferred to other levels 6. Difference between gross and net productivity (NP = GP - R) 7. Biomass equals accumulated production (gC/m 2 ) Primary production of different ecosystems Limits to Productio n 0. Terrestrial primary production limited by raifall and nutrients (primarily nitrogen) 1. Aquatic production limited by light penetration and nutrients (Phosphorus in fw, N in marine) 2. Secondary production is sum of all higher trophic levels 3. 10 % is only approximate , at spring in Florida, producers have 12,382 g/m2/yr, herbivores 8,045, carnivores 362, and top carnivores 21 4. Pyramids of biomass can be inverted, pyramids of energy flow cannot Figure 55.8 Evapotranspiration (ex: temperature and moisture) limits primary production at ecosystem level.
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Figure 54.6
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This note was uploaded on 05/13/2010 for the course BIOL 1202 taught by Professor Gregg during the Spring '08 term at LSU.

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1202L20 - 0. 1. 2. 3. Chapter 55 - Ecosystems Understand...

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