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What are population pyramids?, Schemes and Mind Maps of Evolutionary biology

The University of Texas at AustinEvolutionary biology

The shape of the pyramid reflects the population type. We can distinguish a triangular shape, which reflects a young population type; a bell shape, which ...

Typology: Schemes and Mind Maps

2022/2023

Uploaded on 02/28/2023

mikaell
mikaell 🇺🇸

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Page 1
What are population
pyramids?
They are bar charts which show the structure of the population
by sex and age at a given moment.
The vertical axis represents the age groups in five-year bands.
What are population
pyramids?
80+
75-79
70-74
65-69
60-64
55-59
50-54
45-49
40-44
35-39
30-34
25-29
20-24
15-19
10-14
5-9
0-4
pf3
pf4
pf5
pf8

Partial preview of the text

Download What are population pyramids? and more Schemes and Mind Maps Evolutionary biology in PDF only on Docsity!

Page 1

What are population

pyramids?

They are bar charts which show the structure of the population

by sex and age at a given moment.

The vertical axis represents the age groups in five-year bands.

What are population

pyramids?

The horizontal axis shows the population numbers in

percentages or in absolute figures:

The women on the right:

Percentage of total population

Women

Page 5

The shapes of the pyramids

The shape of the pyramid reflects the population type.

We can distinguish a triangular shape, which reflects a young

population type; a bell shape, which represents an adult

population type; and an urn shape, which indicates an ageing

population.

Percentage of total population

Men 4 620 593 people

Women

Men Women 1.22% 1,65% 22.64% 27,00% 24.03%

Elderly Adults Young people 23,46%

5 028 362 people

10 98765432 10 01 2 3 4 5 6 7 8 10

Source: International Data Base, U.S. Census Bureau.

Total population in 2006: 9,648,955 people

Chad

Triangular

Men Women 5.69% 7,63% 34.69% 34,35% 9.04%

Elderly Adults Young people (^) 8,61%

75-

65- 60- 55- 50- 45- 40- 35- 30- 25- 20- 15- 10- 5- 0-

Percentage of total population

Men 16 358 271 people

Women 16 740 661 people

10 98765432 10 01 2 3 4 5 6 7 8 9

Total population in 2006: 33,098,932 people

Canada

Urn

Source: International Data Base, U.S. Census Bureau.

Men Women 4.36% 6,27% 32.07% 32,06% 12.91%

Elderly Adults Young people (^) 12,33%

80+ 75- 70- 65- 60- 55- 50- 45- 40- 35- 30- 25- 20- 15- 10- 5- 0-

Percentage of total population

Men 19 697 658 people

Women 20 224 175 people

10 98765432 10 01 2 3 4 5 6 7 8 9 10

Total population in 2006: 39,921,833 people

Argentina

Bell

Source: International Data Base, U.S. Census Bureau.

The bell-shaped pyramid indicates an adult population. Its

base is moderate, as birth control has begun. The percentage

of young people is between 25% and 35%.

The population falls slowly towards the top, due to a

high life expectancy, so the percentage of elderly people is

moderate: between 5% and 12%.

Today, this pyramid is typical of developing countries in

Central and South America, Asia and the Middle East.

Men Women

4.36% 6,27%

32.07% 32,06%

12.91%

Elderly
Adults
Young people 12,33%

80+

75-

70-

65-

60-

55-

50-

45-

40-

35-

30-

25-

20-

15-

10-

5-

0-

Percentage of total population

Men

19 697 658 people

Women

20 224 175 people

Total population in 2006: 39,921,833 people

Argentina

Bell
Source: International Data Base, U.S. Census Bureau.

The urn- or bulb-shaped pyramid is characteristic of an

ageing population. It has a narrow base due to a low, and

falling, birth rate. The percentage of young people is lower

than 25%.

The population falls very slowly towards the top, due to a very

high life expectancy. The percentage of elderly people is high:

over 12%.

This pyramid is typical of developed countries in North

America, Europe, Asia (Japan) and Oceania.

Men Women

5.69% 7,63%

34.69% 34,35%

9.04%

Elderly
Adults
Young people 8,61%

80+

75-

70-

65-

60-

55-

50-

45-

40-

35-

30-

25-

20-

15-

10-

5-

0-

Percentage of total population

Men

16 358 271 people

Women

16 740 661 people

Total population in 2006: 33,098,932 people

Canada

Urn
Source: International Data Base, U.S. Census Bureau.