Ch. 9. Aquatic ecosystems and Physiology: Energy Flow Productivity Dissolved Oxygen Fig. 9.1. Hypothetical Trophic Structure Model. Boxes are filled with functional groups, measured as calories of energy, or moles of chemicals, biomass, or numbers.
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Ch. 9. Aquatic ecosystems and Physiology: Energy Flow Productivity Dissolved Oxygen Fig. 9.1. Hypothetical Trophic Structure Model. Boxes are filled.
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Ch. 9.Aquatic ecosystems
and Physiology:
Energy Flow Productivity Dissolved Oxygen
Fig. 9.1. Hypothetical Trophic Structure Model. Boxes are filled with functional groups, measured as calories of energy, or moles of chemicals, biomass, or numbers.
Fig 1.14a. Energy flow model of Cedar Bog Lake, Minnesota (Lindeman 1942)
Food Web Model:
Boxes are filled with SPECIES.
Fig 1.14b. Energy flow model of Silver Springs, Florida (Odum 1971)
PRIMARY PRODUCTIVITY: PHOTOSYNTHESIS
Fig. 9.4.
NPP = GPP – Respiration
The world's ecosystems vary tremendously in productivity.
In terms of NPP per unit area, the most productive systems are estuaries, swamps and marshes, tropical rain forests, and temperate rain forests
To calcualte the total amount of NPP in the world, these values must be multiplied by the area that the various ecosystems occupy.
The most productive systems are open oceans, tropical rain forests, savannas, and tropical seasonal forests