Study Notes on Population Distribution and Density

Topic 2.1 - Population Distribution

Learning Objectives

  • SWBAT (Students Will Be Able To):
    • Identify the factors that influence the distribution of human populations at different scales.
    • Define methods geographers use to calculate population density.
    • Explain the differences between and the impact of methods used to calculate population density.

Population Distribution vs. Population Density

  • Population Distribution
    • Definition: The spread of people across the Earth.
    • Characteristics:
    • The pattern of human settlement.
    • Highlights clustering (areas with a high concentration of people) and dispersion (spread out population).
  • Population Density
    • Definition: A measure of average population per square mile or kilometer.
    • Significance:
    • Measures how crowded a place is.

Factors Influencing the Distribution of Human Populations at Different Scales

  • Physical Factors

    • Climate:
    • Majority of people live in mid-latitude regions (between 30° - 60° N and S) due to:
      • Moderate climates.
      • Better soil quality.
    • Landforms:
    • Majority reside at low altitudes because of:
      • Better soil.
      • Proximity to oceans enhancing trade and climate.
    • Bodies of Water:
    • People predominantly live near lakes and rivers as fresh water is essential to sustain life.

  • Human Factors

    • Cultural Factors:
    • Populations are concentrated in areas with access to services such as:
      • Education
      • Health care
      • Entertainment opportunities
    • Absence of these services often leads to population dispersion.
    • Economic Factors:
    • Populations tend to concentrate in locations that offer:
      • Ports, good roads, railways, and airports.
      • Industrialized and tourism-developed areas.
      • Jobs or perceived economic opportunities PULL people to these areas.
    • History:
    • Human populations usually concentrate in regions with sustainable living conditions.
      • Areas where life flourished saw growth, while harsh environments did not.
    • Politics:
    • Populations grow in regions with political stability and opportunities.

Patterns of Population Distribution Vary by Scale of Analysis

  • The scale of analysis reveals different population distribution patterns.
  • Examination should extend from global to local scales to view these variances.

Methods Used to Calculate Population Density

  • Arithmetic Density:
    • Formula: extTotalPopulation/extTotalAreaofLandext{Total Population} / ext{Total Area of Land}
    • Limitation: Does not take into account the productive quality of the area.
  • Physiological Density:
    • Formula: extTotalPopulation/extArableLandext{Total Population} / ext{Arable Land}
    • Importance: This figure measures the carrying capacity of the land.
  • Agricultural Density:
    • Formula: extNumberofFarmers/extArableLandext{Number of Farmers} / ext{Arable Land}
    • Indicates the efficiency of a country's farmers.
    • LOW agricultural density in developed countries due to access to technology.
    • HIGH agricultural density in developing countries attributed to lack of technological access.

Implications of Methods Used in Population Density Calculation

  • Each method reveals different aspects of the pressure population exerts on land.
  • Arithmetic numbers can be misleading:
    • They may not convey the complete picture of a state's overall well-being.
  • Questions for consideration:
    • What significant changes in physiological density numbers indicate about each country?
    • Why is India's agricultural density notably high?