Ecology 7 - Ecosystems Moving to a larger scale Ecosystems:...

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1 Ecosystems Moving to a larger scale Ecosystems: through a lens of human modification • Energy & chemical transfers through an ecosystem -- • Limiting nutrients in an ecosystem – eutrophication on a mass scale • Pollutants -- acid rain Plants 100,000 kcal Herbivores 10,000 kcal Carnivores 1,000 kcal solar energy 20 million kcal
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2 DDT: fat soluble, 100% transmission Clear Lake, CA, 1950s: DDT: fat soluble, 100% transmission Clear Lake, CA, 1950s: Algae ~ 1 pt/million Small fish ~10 pts/million Large fish ~100 pts/million Birds ~1,000 pts/million
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3 Ecosystems: through a lens of human modification • Energy & chemical transfers through an • Limiting nutrients in an ecosystem – eutrophication on a mass scale • Pollutants -- acid rain Limiting nutrients • algae in ocean: C:N:P 106:16:1 • trees: C:N:P 1000:16:1 But suppose: •so i l: C:N:P 1000:8:1 •trees: C:N:P 1000:16:1
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This note was uploaded on 11/08/2009 for the course HUMBIO 2A taught by Professor Boggs,c;durham,w during the Spring '08 term at Stanford.

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Ecology 7 - Ecosystems Moving to a larger scale Ecosystems:...

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