Concepts of population and development

Geography studies how people live and interact with the environment. In population geography, we focus on:

Where people live (distribution)

Are people concentrated in towns, rural areas, or certain regions?

• Example: Most Tanzanians live in regions with fertile land, like Kilimanjaro and Mwanza.

How many people live in an area (density)

Density is calculated by dividing the population by the land area.

• Example: Dar es Salaam has high population density, while rural regions like Kigoma have low density.

Changes in population size (growth)

Populations grow due to births and migration or decrease due to deaths or emigration.

• Example: Tanzania's population has been growing rapidly due to high birth rates.

Population dynamics refers to changes in the number of people in a specific area due to:

1. Fertility (births): How many children are born.
2. Mortality (deaths): How many people die.
3. Migration: Movement of people into or out of an area.

Example for Tanzania

• Fertility rates are high because many Tanzanian families value large families.
• Mortality rates have decreased due to improved healthcare.
• Migration to cities like Dar es Salaam is increasing due to better job opportunities.

What is Development? Development means improving the quality of life for people by advancing economically, socially, politically, and culturally.

Examples of Development:

• Social: Better schools and hospitals.
• Economic: More industries, businesses, and jobs.
• Political: Strong and stable government policies.
• Cultural: Respect for traditions and values while embracing positive change.

Relationship Between Population and Development

Positive Impact:

1. A large, skilled population can contribute to economic growth.

• Example: Educated youth in Tanzania can innovate and create businesses.

Negative Impact:

1. Rapid population growth can strain resources like food, water, and land.

• Example: Overcrowding in cities like Dar es Salaam leads to housing shortages.

Let's break down some technical terms with examples from Tanzania.

Aging Population

When there are more elderly people (65+) than younger people.

Consequences in Tanzania:

1. Smaller workforce: Fewer young people to work in agriculture and industries.
2. High dependency: Elderly depend on family or government for support.
3. Social challenges: Limited healthcare and pensions for the elderly.

Life Expectancy

The average number of years a person is expected to live.

Tanzania Example: Life expectancy has increased due to better healthcare, especially reducing malaria and HIV/AIDS.

Child Mortality Rate (CMR) and Infant Mortality Rate (IMR)

1. CMR: Number of deaths of children aged 1–5 years per 1,000 live births.
2. IMR: Number of deaths of children under one year old per 1,000 live births.

Tanzania Example: These rates have decreased due to vaccination programs and better maternal care.

General Fertility Rate (GFR)

Number of live births per 1,000 women aged 15–49 years. Tanzania Example: Fertility rates remain high because of cultural preferences for large families.

Dependency Ratio

Ratio of dependents (young and old) to the working-age population. Tanzania Example: Tanzania's high dependency ratio means many young people rely on their parents for education and food.

Sex Ratio

The number of males per 100 females in a population. Example: In Tanzania, the sex ratio is roughly balanced at birth, but women live longer than men.

The number of people in an area is influenced by physical and human factors.

Physical Factors

1. Relief (Topography): People prefer flat or gently sloping areas for farming and building. Example: The fertile slopes of Mount Kilimanjaro are densely populated.
2. Climate: Moderate climates attract people; extreme climates like deserts discourage settlement. Example: Northern Tanzania (Arusha, Kilimanjaro) has favorable climates for agriculture, attracting many people.
3. Vegetation: Dense forests like the Congo discourage settlement, while fertile areas attract people. Example: The Usambara Mountains are densely populated due to fertile soils.
4. Soils: Fertile soils attract farmers. Example: The Nile Basin and areas around Lake Victoria have high population densities.
5. Mineral Resources: Mining areas attract workers and industries. Example: The gold mines in Geita and diamond mines in Shinyanga attract people.
6. Natural Hazards: Flood-prone areas are avoided, but fertile floodplains like those in the Rufiji River Basin attract farmers.
7. Diseases and Pests: People avoid areas with diseases like malaria or pests like Tse-tse flies. Example: Highlands like Arusha have healthy climates and attract settlements.

Human (Anthropogenic) Factors

1. Social-Cultural Factors: Some tribes settle densely to maintain clans and traditions. Example: Chagga people in Kilimanjaro practice intensive farming and live in densely populated areas.
2. Economic Structure: Areas with industries and jobs attract people. Example: Dar es Salaam and Mwanza are densely populated because of trade and industries.
3. Political Stability: Peaceful areas attract people, while conflict zones lead to migration. Example: Refugees from neighboring countries like Burundi and DR Congo settle in Tanzania due to its relative stability.
4. Transport and Communication: Well-connected areas attract businesses and people. Example: Regions near the Central Railway or roads to Dodoma have higher populations.