Lecture1410fc

Lecture1410fc - Chemistry 83 10/21/10 Population Growth and...

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Chemistry 83 10/21/10 1 Population Growth and the Need for Technologies “Go forth and multiply” Genesis 1:28 Joesten,”Essentials”,Saunders, 1993,324 Population Curve up to 2000
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Chemistry 83 10/21/10 2 Cunningham/Saigo, Environmental Science, 6th, McGraw Hill, MA, 2001, 130 (Linear - straight line) Increases by constant amount: 1, 2, 3…. (Exponential - J- shaped) Increases by constant multiple: 1, 2,4,8…. Two common math models used to describe graphs Two most common math models are linear and exponential (J-shaped). The preceding population curve appears to be J- shaped or exponential. Population curve >2000 is expected to be s-shaped (sigmoidal) http://www.emc.maricopa.edu/faculty/farabee/biobk/expgrowth.gif *Carrying capacity - the largest number of any given species that an ecosystem can support indefinitely (unknown for humans).
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10/21/10 3 Turk, Intro to Envir. Studies, 3rd, Saunders, NY, 1989, 85 Projection raises two questions: (1) are we likely to exceed the carrying capacity by 2100? and 2) if so, what are the likely consequences? Population projections are based on sigmoidal curve Cunningham/Saigo, Environmental Science, 6th, McGraw Hill, MA, 2001, 131 Critical number Extinction Possible consequences *Critical number- minimum population required to sustain a species (also not known for humans). Recovery
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Lecture1410fc - Chemistry 83 10/21/10 Population Growth and...

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