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Demographic Transition Models & Population Pyramids

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adri guerrero

on 20 September 2013

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Transcript of Demographic Transition Models & Population Pyramids

Stage 1: prior to the Industrial Revolution, countries had high CBR & CDR rates as children were needed to work, but lack of hygiene & disease caused death
Stage 2: in the mid 18th century, the death rate in Western Europe declined due to improved sanitation, and birth rates remained high. This caused a huge population increase and children became a financial burden for many. In developed countries the CBR began to decrease come the 20th century.
Stage 3: late 20th century, CBR and CDR rates decreased and leveled out. The CBR may be slightly higher than the CDR. Immigration makes up much of the population growth in many developed countries.
The 3 Stages of
Demographic Transition
Demographic Transition Models & Population Pyramids
Adriana Guerrero & Beka Graham

Demographic Transitions
model that describes population change over time
based on interpretation of American demographer Warren Thompson in 1929
created to seek an explanation for countries having high death & birth rates to low rates
Population Pyramid
a graphical illustration that shows the distribution of various age groups in a human population which normally forms the shape of a pyramid.
youngest are represented by a rectangle at the base
oldest by one at the apex
can be called an age-sex pyramid and age structure diagram
typically made fora country or region of the world
Types of Population Pyramids
Stable Pyramid-unchanging pattern of fertility and mortality
Stationary Pyramid-typical of countries with low fertility and low mortality
Expansive Pyramid-very wide at the base, indicating high birth and death rates
Constrictive Pyramid-comes in at the bottom. Population is older, has a low death rate and a low birth rate
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