B1510F07_L17_ecosystems1

B1510F07_L17_ecosystems1 - BIOL 1510 Fall 2007 Ecosystem...

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BIOL 1510 Fall 2007
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BIOL 1510 Fall 2007 Ecosystem The set of organisms living in a particular place and the physical and chemical environment with which they interact. Spatial scales vary tremendously Local scale: lake or forest tract. Regional scale: ocean basin. Global scale: the ocean. The atmosphere and ocean together drive climate and provide a broad physical context for living organisms.
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Flows of Energy and Materials Organisms act to move both energy and materials through ecosystems. The currency used in accounting for these transfers depends on the question being addressed. Energy budgets provide insights into the overall energetics of ecosystems. Mass budgets provide insights into the role of ecosystems in biogeochemical cycles. Trophic (feeding) interactions drive all these transfers of energy and matter.
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Energy Flow Through an Ecosystem
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BIOL 1510 Fall 2007
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Primary production : the formation of organic matter from inorganic matter. Primary producers are also known as autotrophs. Primary production requires a source of energy. Photoautotrophs use light to drive production. Chemoautotrophs use chemical rxns to drive production. Secondary production
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B1510F07_L17_ecosystems1 - BIOL 1510 Fall 2007 Ecosystem...

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