ES Chapter 7 Ecosystem Ecology with pictures

ES Chapter 7 Ecosystem Ecology with pictures - Chapter 7:...

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Chapter 7: Environmental Systems and Ecosystem Ecology www.aw-bc.com/Withgott
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Environmental Systems community ecology (different species) ecosystem level (living and non-living) environmental systems solar radiation geothermal activity organism's metabolism human activity pollution
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Feedback Input : parts of a system that causes the condition observed freshwater sediments nutrients pollution Output : products obtained from the system matter and energy in the form of fish/shellfish
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Feedback loop when the output of a system can become the input Negative feedback loop: input and output neutralize each other by dynamic equilibrium resulting in homeostasis (stabilized) thirst and drinking Positive feedback loop : drive the ecosystem to one of the extremes. Rare in nature but common when humans alter the environment erosion
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Dead Zone area in which oxygen depletion is evident (hypoxia) normal oxygenated water has 10ppm depletion is 2ppm or less below 1.5ppm most organisms die caused by several factors urban runoff fertilizers municipal sewage industrial discharges fossil fuel emissions
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Types of Environmental Systems lithosphere (rock and sediment) atmosphere (air) hydrosphere (water systems) biosphere (biotic and abiotic) they overlap in some way (Ecosystems)
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Ecosystems interaction of living and non-living components energy (food) is converted into biomass (growth and repair) nutrients can limit productivity too much nitrogen causes dead zone in the gulf too much phosphorus causes dead zones in fresh water ponds and lakes iron seems to be the factor in open ocean waters
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Primary Productivity Worldwide Productivity grams of Carbon per meter squared per year www.aw-bc.com/Withgott
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ES Chapter 7 Ecosystem Ecology with pictures - Chapter 7:...

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