The Human Population Studying Human Population Chapter Nine Section One.
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Transcript of The Human Population Studying Human Population Chapter Nine Section One.
The Human Population
Studying Human Population
Chapter Nine
Section One
Demography – study of populations
• Developed countries– Higher average income
– Slower pop. growth
– Diverse industrial economy
– Strong social support systems: health care, family support, food services
• Developing countries– Lower average income
– Simple and agricultural based economies
– Rapid population growth
Exponential population growth
Age structure diagrams
• Distribution of ages in a specific population at a certain time
• Can be graphed as a population pyramid – a double sided bar graph
Population Pyramids
Survivorship Curves
• Survivorship – percentage of members of a group that are likely to survive to any given age
• Type I – wealthy developed countries, most people live to old age
• Type II – similar death rate at all ages
• Type III – many children die
Fertility Rates and Migration
• Fertility rate - # of babies born each year per 1000 women
• Migration – movement of individuals between areas
• Immigration – movement in (keeping population of developed nations from decreasing)
• Emigration - movement out
Fertility rates in the U. S.
Declining Death Rates
• Death rates declined more than birth rates because of clean water, adequate food, safe sewage disposal, vaccines
• Life expectancy – average number of years a person is expected to live– Most affected by infant mortality, the death rate
of infants less than 1 year old