Ch 54 - 0. 1. 2. 3. Chapter 54 - Ecosystems Understand what...

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Chapter 54 - 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 54.2 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 ) Figure 54.4 Primary production of different ecosystems Limits to Productio n 0. Terrestrial primary production limited by rainfall 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
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Ch 54 - 0. 1. 2. 3. Chapter 54 - Ecosystems Understand what...

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