Ecosystem Ecol II 2011

Ecosystem Ecol II 2011 - ECOSYSTEM ECOLOGY Stoichiometry,...

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Ecosystems Lecture 2 1 E COSYSTEM E COLOGY Stoichiometry, Soil, & Water All streams flow into the sea, Yet the sea is never full; To the place from which they flow The streams flow back again. Ecclesiastes 1:7 S TOICHIOMETRY Relative quantities (ratios) of elements Baking is analogous Flour : Sugar : # Eggs How many people can you feed with the ingredients you have? What will run out first? Do you need to go shopping to feed everybody? S TOICHIOMETRY Relative quantities (ratios) of elements Nitrogen: Phosphorus Carbon: Nitrogen ATP 2:1 Bacteria 5:1 Protein no P Algae 10:1 Bone 1:1 Alfalfa 12:1 Brain 15:1 Cornstalks 60:1 Muscle 50:1 Sawdust 600:1
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Ecosystems Lecture 2 2 E COLOGICAL S TOICHIOMETRY Requirements of organisms vs. Amounts in environment Redfield Ratio Plankton on average: 106 C : 16 N : 1 P Plankton, on average: Same for ocean itself! Compare with humans: 49 C : 6.5 N : 1 P Alfred Redfield, 1958 Carl Sprengel Sprengel Liebig Law of the Minimum “By the deficiency or absence of one necessary constituent, all others being present , the soil is rendered barren for all those crops to the life of which that one constituent is indispensable.” Justus von Liebig From: Soil Sci. Soc. Am. J. 65(5). 1999 What matters is RATIO ATIO of necessary nutrients Citrus with Zn deficiency Limiting Nutrient Material whose availability controls the growth, abundance, or distribution P added E COLOGICAL S TOICHIOMETRY of organisms Self test: N:P = 20 vs. N:P = 12 Algae in Manitoba lakes limited by P ht p:/ www.umanitoba.ca/institutes/fisheries/ No P added David Schindler
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Ecosystems Lecture 2 3 Lake Okeechobee, Florida 1973: N:P = 30:1 LIMITING IMITING NUTRIENTS UTRIENTS -CASE ASE 2- 2000: N:P = 15:1 What might have happened?
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This note was uploaded on 08/18/2011 for the course ECOLOGY 351 taught by Professor Staff during the Spring '11 term at Rutgers.

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Ecosystem Ecol II 2011 - ECOSYSTEM ECOLOGY Stoichiometry,...

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