EcosystemsLect3-1 - Dynamics of Ecosystems Chapter 57 1 2...

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1 Dynamics of Ecosystems Chapter 57
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3 Biogeochemical Cycles Ecosystem: any place in nature – some degree of permanence where energy flows and nutrients/minerals cycle between the biotic (living) and abiotic (non-living) parts of the area. Biogeochemical cycles: chemicals cycling through ecosystems between biotic and abiotic
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5 Biogeochemical Cycles Molecules have a source and sink – Atmosphere Lithosphere Hydrosphere Biogeochemical cycles usually cross ecosystem boundaries Carbon is a major molecule
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6 Biogeochemical Cycles The carbon cycle – source = Atmosphere
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7 Biogeochemical Cycles Carbon fixation: changing CO 2 from a gas into organic compounds through photosynthesis. CO 2 + H 2 O C 6 H 12 O 6 + O 2
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8 Biogeochemical Cycles Methane producers Microbes produce by anaerobic cellular respiration Methanogens: produce methane (CH 4 ) Wetland/tundra ecosystems are a source of CH 4 –CH 4 is oxidized to CO 2 , but can remain as CH 4 for a long time
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9 Biogeochemical Cycles Existing fossil fuels (coal, crude, gas) were formed over geological time Human burning of fossil fuels is creating large imbalances in the carbon cycle The concentration of CO 2 in the atmosphere is increasing year by year
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Increase in CO 2 10
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Cycling vs Sustainability vs Subsidization 11 We use ~100-1000X more calories for peripherals than calories for food. The difference???
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Cycling vs Sustainability vs Subsidization 12 H 2 CO 3
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Earth’s Estimated Biocapacity 13
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Violating the principle of cycling 14 Why doesn’t DDT cycle?
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15 Biogeochemical Cycles Water Cycle – Source = Hydrosphere and Atmosphere All life depends on the presence of water Water availability determines the nature and abundance of organisms Living Organisms Synthesize during cellular respiration Disassemble during photosynthesis
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