Population Structure
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Transcript

  • 1. Population Structure
  • 2. Learning Objectives
    • Interpret the age-sex structure of a country from a population pyramid
    • Describe how and explain why the UK’s population structure has changed
    • Make links between the DTM and population structure
    • Compare population pyramids from the LEDW and MEDW
  • 3. Population Structure
    • Population structure is the make up of the total population in a country or area where people are grouped by age and sex.
    • The graphical technique used to summarise age structure is the population pyramid.
  • 4. Interpreting Pop Pyramids Start at the base – what has happened recently? Next go to the top – how long do people live for? Then look at the middle – are there any age groups that stand out? Long / short bars?
  • 5. Dependent Population
  • 6. Dependent Population
    • The dependency ratio is directly linked to a country’s age structure.
    • To calculate it, the population is split into economically active (15-64) and inactive (0-14 and 65+)
    • Dependency ratio is calculated as a % using:
    Number of economically active Number of non-economically active X 100
  • 7. How has the population structure of the UK changed over time?
  • 8. How has the population structure of the UK changed over time?
  • 9. How has the population structure of the UK changed over time? Male Female Population in millions
  • 10. How has the population structure of the UK changed over time?
  • 11. Population Structure of the UK
    • Write a case study to describe how and why the population structure of the UK has changed from 1841-1981.
    • Use annotated sketches of population pyramids to help you.
    • P172-173
  • 12. MEDW vs LEDW
    • The shape of a population pyramid gives a clear indication of the development status of a country and can therefore be linked with countries in the MEDW or the LEDW.
  • 13. LEDW This country has a high BR – the pyramid has a wide base But it also has a high DR – shown by the steeply sloping pyramid
  • 14. Falling BR In some LEDCs, the Government is encouraging families to have fewer children so the BR is falling – the base is becoming narrower.
  • 15. MEDW Low DR – pyramid is wider at the top The largest group of people was born around 40 years ago – ‘baby boomers’. There are roughly the same amount of people in each age category – BR is stable. Male Female Population in millions
  • 16. Declining population BR is falling – the number of people in each category is getting smaller In the future the elderly population will make up the largest section of the population – an ageing population
  • 17. MEDW vs LEDW Male Female Population in millions
  • 18. Population Structure and the DTM
    • The shape of a population pyramid gives a clear indication of the development status of a country and can therefore be linked with a particular stage of the DTM
    • http://www.bbc.co.uk/scotland/education/geog/population/
  • 19. Activity
    • Using P174-175
    • Sketch population pyramid for each stage of the DTM
    • Give reasons for the changes
  • 20.