b112_Lecture_54

B112_Lecture_54 - Overpopulation • In 1986 the world population hit 5 billion • Population is increasing at ~1.7 per year • Population will

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BIOL 112, Chapter 54 Ecosystems
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Primary Productivity Only about 1-2% of the visible light from  the sun is converted to chemical energy by  photosynthesis NPP = GPP – Rs NPP is often 50-90% of GPP
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Measuring Primary Productivity Measuring biomass production, dry weight  (g/m 2 /yr) Light-dark bottle experiments, measuring  net oxygen production (g O 2 /m 2 /yr)
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Secondary Productivity
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Biomass Pyramids
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Pyramid of Numbers
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Biogeochemical Cycles
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Human Impacts on the  Environment
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The Biosphere is a Closed  System Sunlight is the only input All other parts of the biosphere are finite  and must be recycled
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Four Areas of Concern 1. Overpopulation. 2. Resource depletion. 3. Pollution. 4. The human element.
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Unformatted text preview: Overpopulation • In 1986 the world population hit 5 billion • Population is increasing at ~1.7% per year • Population will double every 41 years • Currently between 6 and 7 billion Factors Responsible for Rapid Population Growth • Increased food production. • Better disease control. • Better sanitation. • No decrease in birth rates. Resource Depletion • Renewable Resources – Water – Biomass – Soil & minerals • Nonrenewable Resources – Fossil Fuels – Species Pollution • Eutrophication • Smog • Toxic Waste • Greenhouse effect • Ozone depletion The Human Element • Frontier mentality • Tragedy of the commons...
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This note was uploaded on 06/18/2009 for the course BIOL- 112 taught by Professor Bryanness during the Fall '09 term at Pacific Union.

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B112_Lecture_54 - Overpopulation • In 1986 the world population hit 5 billion • Population is increasing at ~1.7 per year • Population will

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