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Population. A Closer Look. Population Equation. r = (b-d)+(I-e) Birth rate Death rate Immigration Emigration The growth rate (r) is expressed in a percentage. Reproductive strategies. Survivorship Curves. Human Population. A Look at the Human Race. Different Worlds.

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Population l.jpg

Population

A Closer Look


Population equation l.jpg
Population Equation

  • r = (b-d)+(I-e)

    • Birth rate

    • Death rate

    • Immigration

    • Emigration

    • The growth rate (r) is expressed in a percentage




Human population l.jpg

Human Population

A Look at the

Human Race


Slide6 l.jpg

Different Worlds

  • Rich Nations/Poor Nations

    • 3 main economic categories in 2 classes

      • Developed countries - high income, highly developed, industrialized countries(US, Canada, Japan, E. Asia, Western Europe)


Slide7 l.jpg

  • Developing countries

    • Middle income, moderately developed- Latin America, West Africa, E. Asia, E, Europe, Former USSR, Brazil

    • Low income countries - E. Central Africa, India, Central Asia, Ethiopia


21 of the population is in developed countries they control 80 of the world s wealth l.jpg
21%of the population is in developed countries. They control 80% of the world’s wealth

  • General Pyramid structures


Slide9 l.jpg

FEMALES 80% of the world’s wealth

To the right

MALES

To the left

POPULATION STRUCTURE

The population pyramid displays the age

and sex structure of a country or given area

OLD DEPENDANTS

ECONOMICALLY

ACTIVE

YOUNG

DEPENDANTS

Population in

Five Year

Age bands

Usually, but not always,

In % to make for easier

comparisons

between countries


Slide10 l.jpg

What Population Pyramids Show Us 80% of the world’s wealth

KEY

Economically

More

Developed

Country

Economically

Less

Developed

Country

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 differentpopulation 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


Slide12 l.jpg

Population Pyramids related to the 80% of the world’s wealth

Demographic Transition Model

Stage 1

Stage 2

Stage 3

Stage 4

IMPLICATIONS

IMPLICATIONS

IMPLICATIONS

IMPLICATIONS

Both birth rates and

Death rates are

High, so population

growth rates are

slow but population

Is usually restored

Due to high birth

Rate. Short life

Expectancy

EXAMPLES

Population continues

to grow but at slower

rate. Low C Death Rate.

Dramatically declining

Crude Birth Rate.

EXAMPLES

Low Crude Birth Rate

and Crude Death Rate

Higher dependancy ratio

and longer life expectancy

Crude Death Rate does

Rise slightly because of

The ageing population

EXAMPLES

Population starts

to grow at an

exponential rate due to fall in Crude Death Rate. More living In middle age.

Life expectancy rises

Infant mortality rate falls.

EXAMPLES

Japan, USA

Republic of Congo

New Guinea

Algeria, Tunisia

Morocco

There is some merit in including or considering

a Stage 5 today with a declining population


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