POPULATION STRUCTURE The population pyramid displays the age and sex structure of a country or given area Population in Five Year Age bands Usually but not always In to make for easier comparisons ID: 667635
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Slide1
Age structure diagrams
A way of predicting population changesSlide2
POPULATION STRUCTURE
The population pyramid displays the age
and sex structure of a country or given area
Population in
Five YearAge bands
Usually, but not always,In % to make for easiercomparisonsbetween countries
FEMALES
To the right
MALES
To the leftSlide3
What Population Pyramids Show Us
KEY
slope of pyramid indicate the death rate
width of the base is related to birth rate/fertility rate
proportions of men and women can suggest male or female migrations
height of graph can indicate life expectancy (ignore the very thin end of the
wedge as occurs on graph B as these people are a definite minority)
"kinks" indicate dramatic reductions in birth rate or increases in
death rate in the past
area of graph indicates total population - compare areas of different
population age groups or different sex on one graph
The overall shape of the population pyramid can indicate whether it is an
Economically More Developed Country or Economically Less Developed Country
Economically
More
Developed
Country
Economically
Less
Developed
CountrySlide4
Population pyramid of a less developed
nation (broad base population pyramid)
Population Pyramid of Nigeria (1995)Slide5
Importance of Population Pyramids
A BROAD BASE POPULATION
PYRAMID
MEANS A COUNTRY SHOULD:
increase food productionbuild
more homes & schoolsplan for more job opportunities for the young in futureimplement birth control program/
campaigns
Usually agricultural population with problems of overpopulation.Slide6
Population pyramid of a developed nation
Population Pyramid of Sweden (1995)Slide7
Importance of Population Pyramids
A NARROW BASED POPULATION
PYRAMID MEANS
:
Birth rate and Death rate
low so a country may need to:Work out incentives to encourage more births
Begin hiring foreign
laborEnsure proper medical services & health care for the agedSlide8
Ages 0-14
Ages 15-44
Ages 45-85+
Rapid Growth
Guatemala
Nigeria
Saudi Arabia
Slow Growth
United States
Australia
Canada
Male
Female
Zero Growth
Spain
Austria
Greece
Negative Growth
Germany
Bulgaria
Sweden
Age Structure DiagramsSlide9
U.S. Population by age 1900, 2000, and 2050 projected
Predict the future population change for each of the three age structure diagramsSlide10
Population structure by age and sex in developed and developing countries. Slide11
Tracking the baby-boom generation in the U.S.Slide12
Thomas Robert Malthus
1766-1834Slide13Slide14
Growth Potential of
Subsistence Vs. PopulationSlide15
Basic Point From MALTHUS:
Population and food supply (subsistence) grow at different rates
Population will outgrow food supply
Results from the point of crisis include famine and warSlide16
What are advantages and disadvantages of reducing births: Controversy
Can the world’s resources support an additional 2.5 billion by 2050?
Is the Earth overpopulated?
Carrying capacity
If yes, what should be done?
What is a sustainable population?