Population Growth

Population Growth - interval = Births during time interval...

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1/31/11 Population Growth Consider a single bacteria Divides every 20 minutes under ideal conditions So in 20 minutes 2 bacteria, 40 min. 4 bact, 80 min. 8 In 36 hours there would be a layer of bacteria 1 foot deep over the entire Earth Consider Elephants Produce 6 young in 100 years 1 pair of elephants could produce 19 million in only 750 years Why aren’t there more Elephants?
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1/31/11 Population Growth Models: Exponential Growth Population under ideal conditions (no limited resources) What we want to see is how the population size changes from 1 year to the next. OR change in population size during some time
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Unformatted text preview: interval = Births during time interval Deaths during time interval Now mathematically N = population size t = time period B = # of births 1/31/11 Population Growth Models: Exponential Growth We can rewrite the equation: / = -D Take B (average births) and convert it to the birth rate (avg. # of offspring produced per individual in population) Example: population of 1000 individuals has 34 births in one year, then the birth rate is 0.034 Do the same thing with D (average...
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Population Growth - interval = Births during time interval...

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