BIOL 121 Chapter Notes - Chapter 54: Soil Organic Matter, Trophic Cascade, Trophic Level
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BIOL 121 Full Course Notes
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Document Summary
Ecosystem: all of the organisms living in an area along with the abiotic components of that area that exchange energy with the organisms: four components: Maintenance: used to replace worn-out cell components, transport material, synthesize chemical signals, and produce molecules and structures that function in defense of disease or attack. Growth: chemical energy not required for maintenance is used for. Consumers: organisms that eat other living organisms: primary consumers: eat primary producers, secondary consumers: eat primary consumers, tertiary consumers: eat secondary consumers. Decomposers/detritivores: obtain energy by feeding on the remains of organisms or waste products: detritus: dead animals and dead plant tissues, primary decomposer: an organism that feeds on plant detritus (usually bacteria/archaea or fungi) The four components of an ecosystem are linked by the movement of energy and nutrients. Gross primary productivity: the total amount of photosynthesis in a given area and time period.
