chapter 42 edited

chapter 42 edited - Ecosystems Chapter 42 Ecosystem Loss:...

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Unformatted text preview: Ecosystems Chapter 42 Ecosystem Loss: Louisiana Marsh transformed to bay 42.1 Ecosystems Ecosystem An array of organisms and their physical and chemical environment Inputs and outputs of energy and nutrients Energy flows one way, into and out of an ecosystem Materials are cycled among resident species Energy Sources Sunlight supplies energy to most ecosystems Primary producers Convert energy of sunlight into chemical energy Take up nutrients that all living organisms require Consumers Herbivores, carnivores, omnivores, decomposers , and detritivores get energy from food Ecosystem Model Trophic Levels Organisms in an ecosystem are classified by trophic levels (feeding levels) Organisms at the same trophic level are the same number of steps away from the energy input A food chain shows who eats whom Path of energy and nutrient flow among organisms Food Chain and Trophic levels Key Concepts: ORGANIZATION OF ECOSYSTEMS An ecosystem consists of a community and its physical environment A one-way flow of energy and a cycling of raw materials among its interacting participants maintain it It is an open system, with inputs and outputs of energy and nutrients 42.2 Food Webs Food chains interconnect as food webs Most ecosystems support only four or five trophic levels away from original energy source Efficiency of energy transfers is low Arctic Food Web Types of Food Webs Grazing food webs Most energy captured by producers flows to herbivores Detrital food webs Most energy flows from producers directly to detritivores and decomposers Food Web Model: Colorado...
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This note was uploaded on 03/10/2011 for the course BIOL 1409 taught by Professor Staff during the Spring '11 term at Dallas Colleges.

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chapter 42 edited - Ecosystems Chapter 42 Ecosystem Loss:...

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