Population reading check

The study of population is important because

The study of population is important because

1. More people are alive than ever before

2.Virutally all local population growth is in developing countries

3.The world population increased at a faster rate during the second half of the 20th century than ever before.

Carrying Capacity

the maximum population size of a species that an environment can sustain given the available resources .

Overpopulation

when the number of people exceed the carrying capacity

Demography

The study of population characteristics

We can understand how population is distributed by two properties..

Concentration and Density

Two thrids of the worlds population is in what four regions?

East Asia, South Asia, Europe, Southeast Asia

arithmetic density

Total number in an area

Physiological density

The total number of people per unit of arable land

Agricultural Density

The total number of farmers per unit of arable land.

Arable Land

Land suited for agriculture

Natural Increase Rate NIR

The PERCENTAGE by which a population grows ina year

doubling time

The time it takes for a population to double in size

Crude birth rate (CBR)

the total NUMBER of live births in a year per 1000 people alive in a society.

total fertility rate(TFR)

measures the adverage NUMBER of children a women will have throughout childbearing years. (age 15-49).

Replacement Rate (RR)

2.1 (.1 to account for deaths and some women may not have kids)

2.2 or higher=GROWTH 2.0 or lower=DECREASE

Developed countries=...

lower agricultural density

Developing countries=...

Higher agricultural densitys

infant mortality rate (IMR)

The annul NUMBER of infants deaths under one year of age, compared with total live births. OR the number of infants deaths per 1,000 births.

Crude death rate (CDR)

Total number of deaths in a year per 1,000 people in a society.

combined CDR for developing countries is

lower than the combined rate for all developed countries.

Difference in CDR is..

much less extreme than CBR

Neo Malthusians

Believe in Thomas Malthus and his theory, but the expect that its not just food. Its resources. (Underlying concept) World resources are limited.

Thomas Malthus was the first to claim..

The worlds rate of population increase was far outrunning the development of food supplies

Neo Malthusians believe...

The world faces a bad future where people are in desperate competition for food, water, and energy.

As space declines in quantity...

more effort is needed to yield the same amount of crops. This.. -extends the working day for women

maternal mortality rate

the number of maternal deaths(Mothers die) during a given time period per 100,000 live births during the same time period