Human Population Dynamics and Distribution

Human Population Studies

1. How is the population studied?

Population Size

This refers to the absolute population. From this, we can calculate the population density (number of inhabitants / surface area).

Population Development

This determines whether the population grows or decreases. We calculate this using natural growth.

• Birth Rate: The number of births occurring in a population.
• Fertility Rate: The estimated average number of children a woman will have in her lifetime. This rate helps us know if generational replacement is assured.
• Mortality Rate: The number of deaths that occur in a population. Infant mortality can also be estimated.

However, to see the real growth, we must also take into account migration.

Population Structure

This involves understanding the composition of the population. According to economic activity, it is divided into:

• Active Population: People of working age.
• Employed Population: Those who work and receive payment for it.
• Unemployed Population: Those who are unemployed but are actively seeking work.
• Inactive Population: Those not of working age (e.g., students, retirees).

2. Evolution of the Population

Slow Growth Until the 19th Century

Characterized by high birth rates and high mortality rates due to wars, famines, and epidemics.

Population Explosion

Caused by a decrease in mortality, improved agricultural techniques, medical advances, and better hygiene.

Current Situation and Forecast

Underdeveloped countries are experiencing the fastest growth, while the global population is projected to age.

3. Population in Underdeveloped Countries

High Growth

This is due to high birth rates influenced by several factors:

• Children are seen as a source of labor.
• High infant mortality rates encourage having more children to ensure some survive.
• The social status of women is often tied to motherhood.
• Religious beliefs.
• Lack of family planning campaigns.

Lower Life Expectancy and a Young Population

The population is predominantly young with a shorter average lifespan.

Problems and Policies

• Problems: Hunger, scarcity of natural resources, need for more services and housing, and lack of jobs.
• Policies: Some countries have implemented family planning policies.

4. Population in Developed Countries

Slow Growth

Characterized by very low birth rates, with an average fertility rate of 1.5 children per woman. Factors influencing this include:

• Increased participation of women in the workforce.
• Widespread use of contraception.
• Delay in the age of starting a family.
• High costs associated with raising children.
• Changes in social values and religious influence.

High Life Expectancy and an Aging Population

The population is, on average, older with a longer lifespan.

Problems and Policies

• Problems of an aging population: Increased government spending on healthcare and pensions, potential curbs on economic growth, and obstacles to developing new initiatives.
• Policies: Governments may introduce policies to favor birth rates and manage social expenses.

Population Distribution and Migration

1. Where Do People Live?

Physical Factors

People tend to settle in places with abundant water, temperate climates, valleys, and plains, and where natural resources and energy are available.

Traditional, Economic, and Political Factors

Settlement patterns are also influenced by:

• Areas inhabited since ancient times.
• Zones of significant economic activity.
• Government policies that require relocation or promote settlement in certain areas.

2. Major Population Concentrations

The world's largest population centers are in East Asia, Europe, and the northeastern coast of the United States. There are also smaller, dense pockets of population in areas like the Gulf of Guinea and central Mexico.

3. Migration: Definition and Causes

• Migration: The displacement of a population that involves a change of residence.
• Emigrant: A person who is leaving their place of residence.
• Immigrant: A person who is arriving from an outside location.

Reasons for Migration

People leave their homes for various reasons, including:

• Political reasons (e.g., conflict, persecution).
• Economic reasons (e.g., seeking employment).
• Natural disasters.