population pyramids. population pyramids graph that shows the percentage of population in certain...

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 !!