lect12 - population size 1 2 4 3 time population growth...

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time population size population size population growth rate 1 2 3 4 5 6 1 2 3 4 5 6
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Pre-reproductive Reproductive Post-reproductive birth rate = 54/1000 death rate = 13/1000 growth rate = 41/1000 = 4.1%/year birth rate = 16/1000 death rate = 9/1000 growth rate = 7/1000 = 0.7%/year birth rate = 10/1000 death rate = 12/1000 growth rate = -2/1000 = -0.2%/year crude growth rate = crude birth rate – crude death rate - expressed as numbers per 1000
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Date estimated N doubling time (yr) 8000BC 5,000,000 1650AD 500,000,000 1,500 1850 1,000,000,000 200 1930 2,000,000,000 80 1980 4,500,000,000 44 1990 5,400,000,000 38 1998 6,000,000,000 35 2007 6,700,000,000 ~32 Improvements in agriculture and living conditions resulted in larger populations as death rate declined and life expectancy increased. 205,000 individuals added each day! A new U.S. population is added every 4 years.
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Growth rate peaked at 2.2% in 1962 Annual Percent Increase in the Global Human Population Famine in China that killed ~ 60
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lect12 - population size 1 2 4 3 time population growth...

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