Examining Population Density and Dispersion The following image shows a world map of human population density. Discuss with your group, the patterns that you see. Consider - Where on the map do you see the greatest population? The least population? - What “pattern of spacing” – or dispersion - do you notice?
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Examining Population Density and Dispersion The following image shows a world map of human population density. Discuss with your group, the patterns that.
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Examining Population Density and DispersionThe following image shows a world map of human population density. Discuss with your group, the patterns that you see. Consider- Where on the map do you see the greatest
population? The least population? - What “pattern of spacing” – or dispersion - do
you notice? - Why do you see this type of population
• Put your pens down for a minute & think about this:– An employer offers you two equal jobs for one hour
each day for fourteen days. – The first pays $10 an hour.– The second pays only 1 cent per hour, but the rate
doubles each hour.– Which job will you accept?
Understanding Exponentials
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Job 1 Job 2
Job 2 lags for a long time before
exponential growth kicks in!
Now, how much would your employer owe you if you stayed at this job for another 2 weeks?
What would happen if this type of growth took place
within a population?
1) Exponential growth model• Also called geometric growth or J-shaped growth.• First growth phase is slow and called the lag phase• Second growth phase is rapid and called the exponential
growth phase• Bacteria can grow at this rate, so why aren’t we up to our
ears in bacterial cells?
Population Growth Models
• Limits to exponential growth– As population density increases, competition follows
as nutrients and resources are used up– The limit to population size that a particular
environment can support is called carrying capacity (k)