Population Pyramids

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Introduction to Population Pyramids for Cultural Geography

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Population Pyramids

  1. 1. Population Pyramids by Gayle Robinson http://orru.latervista.org
  2. 2. Population Pyramids <ul><li>Provide 3 types of information : </li></ul><ul><ul><li>Age/gender distribution </li></ul></ul><ul><ul><li>Dependency ratio </li></ul></ul><ul><ul><li>Demographic Transition position </li></ul></ul>
  3. 3. Age/Gender Distribution Each bar represents a 5-year increment beginning at 0. Males are shown on the left. Females are shown on the right.
  4. 4. Dependency Ratio Elderly population 65+ years of age Children 0-14 years of age Workforce
  5. 5. The Demographic Transition Model Low Growth High growth Moderate Growth Low Growth http://www.uwmc.uwc.edu/geography/Demotrans/demtran.htm Population Pyramid Shape
  6. 6. Stage 1: Low Growth <ul><li>No country in Stage 1 today </li></ul><ul><li>High Crude Birth and Death Rates </li></ul>
  7. 7. Stage 2: High Growth <ul><li>Large base with high CBR </li></ul><ul><li>Developed world entered this stage during Industrial Revolution </li></ul><ul><li>Increased Life Expectancy </li></ul><ul><li>Decreased CDR </li></ul>Fig. 2-16: Population pyramids can vary greatly, with different fertility rates (Laredo vs. Honolulu), or among military bases (Unalaska), college towns (Lawrence), and retirement communities (Naples).
  8. 8. Stage 3: Moderate Growth <ul><li>CBR decreases through societal changes </li></ul><ul><li>CDR continues to decrease </li></ul>Fig. 2-17: Cape Verde, which entered stage 2 of the demographic transition in about 1950, is experiencing rapid population growth. Its population history reflects the impacts of famines and out-migration.
  9. 9. Stage 4: Low Growth <ul><li>Smaller base with decreased CBR </li></ul><ul><li>Larger number of elderly population </li></ul><ul><li>Can become top-heavy with decreased CBR </li></ul>Fig. 2-18: Chile entered stage 2 of the demographic transition in the 1930s, and it entered stage 3 in the 1960s.

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