Ecosystem Ecology I-lecture

Ecosystem Ecology I-lecture - Georgia Tech School of...

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Biology 1510/1511 Georgia Tech School of Biology Fall 2008 Ecosystem Ecology
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Biology 1510/1511 Georgia Tech School of Biology Fall 2008 An Ecosystem is One or more communities and the physical environment Energy flow and chemical cycling Energy and matter are transformed through photosynthesis and feeding relationships
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Biology 1510/1511 Georgia Tech School of Biology Fall 2008 Energy and matter Energy flows thorough ecosystems It must be renewed Matter cycles within the ecosystem
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Biology 1510/1511 Georgia Tech School of Biology Fall 2008 Food Webs
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Biology 1510/1511 Georgia Tech School of Biology Fall 2008
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Biology 1510/1511 Georgia Tech School of Biology Fall 2008 Conservation of Energy Laws of physics and chemistry apply to ecosystems, particularly energy flow The first law of thermodynamics states that energy cannot be created or destroyed, only transformed Energy enters an ecosystem as solar radiation, is conserved, and is lost from organisms as heat
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Biology 1510/1511 Georgia Tech School of Biology Fall 2008 Energy Budgets Total solar input = energy in molecules + amount lost as heat Energy transfer is not completely efiicient some energy is ALWAYS lost as heat We can use estimates of efficiency of energy transfer up the food chain to determine how many organisms a habitat can support
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Biology 1510/1511 Georgia Tech School of Biology Fall 2008 Conservation of Mass The law of conservation of mass states that matter cannot be created or destroyed Chemical elements are continually recycled within ecosystems In a forest ecosystem, most nutrients enter as dust or solutes in rain and are carried away in water If outputs >> inputs then that nutrient will limit production in that system
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Biology 1510/1511 Georgia Tech School of Biology Fall 2008 Energy, Mass, and Trophic Levels
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Biology 1510/1511 Georgia Tech School of Biology Fall 2008 Detritivores, or decomposers , are consumers that derive their energy from detritus , nonliving organic matter Convert organic material into inorganic compounds used by primary producers
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Ecosystem Ecology I-lecture - Georgia Tech School of...

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