POPULATION PYRAMIDS

Population PyramidsGraph that shows the percentage of

population in certain age groupsSeparates Male and FemaleAllows you to make predictions

Deciphering Population Pyramids

http://www.prb.org/Multimedia/Video/2009/distilleddemographics1.aspx

In this first video, "Deciphering Population Pyramids," PRB senior demographer Carl Haub shows how population pyramids give us a snapshot of a country's demographic profile. But what do they tell us about a country's past and future? "These videos not only show that demography can be exciting, but also highlight how population trends and issues affects the well-being of us all," says Haub. "Fertility, mortality, and migration—along with other demographic issues—play a major role in determining what kind of opportunities and challenges people face in their communities and countries."

Stage OneHigh Birth RateHigh Death RateResult: slow growth ratesPre-industrial, hunter/gatherer societies

in remote areas.

Stage TwoHigh Birth RateLow or Falling Death

RateResult: Rapid Growth

RateVery LOW Standard of

LivingFound In Least

Developed CountriesSouth AmericaSouthern AfricaAsia

Stage ThreeModerate to High Birth RateLow Death RateResult: Explosive Growth RatesCauses a large population increase, but

standard of living remains low Developing Countries and the Newly

Industrialized CountriesFound In Countries:

MexicoSoutheast AsiaMiddle East

Stage FourLow birth ratesLow death ratesResult: slow or no

growth ratesPopulation slowly

increases, with a high standard of living

Developed CountriesUSACanadaAustralia Europe

Stage FiveNegative Birth Rate

NEGATIVE or NO GROWTH

Low Death RateResult: No growth, even

population lossPopulation begins to

shrink, usually has a high standard of living

Found In “Post-Developed” CountriesGermanySwedenNorwayItaly

Rapid, Slow, Zero and Negative Population Growth

http://www.bio.georgiasouthern.edu/bio-home/harvey/lect/images/agestructure.gif

High fertility and mortality = broad base

Low fertility and mortality = narrow base

Time to make a population pyramid !!