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Understanding Population Growth: Factors and Trends

Explore the dynamics of population growth, from birth and death rates to immigration and carrying capacity. Learn about exponential and logistic growth, the impact of limiting factors, and the historical patterns in human population growth. Discover the current world population trends and the demographic shifts since the US Census in 2010.

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Understanding Population Growth: Factors and Trends

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  1. Chapter 5 Populations

  2. Factors Affecting Population Growth • Birthrate (+) • Death rate (-) • Immigration (+) • Emigration (-)

  3. Exponential Growth • The size of each generation of offspring will be larger than the one before it • The larger the population gets, the faster it grows

  4. Logistic Growth • Is when a population’s growth slows and then stops, after a period of exponential growth • Growth stops when birthrate = death rate and immigration = emigration

  5. Carrying Capacity • Is the maximum number of individuals of a particular species that a particular environment can support

  6. Limits • A limiting factor controls the growth of a population • Examples – competition, predation, parasitism, disease, unusual weather, natural disaster • These determine carrying capacity

  7. Human Population • Slow growth early • Civilization advancements increased growth • Bubonic plague caused a decrease • Industrial Revolution led to exponential growth

  8. Current world population over 7 billion • US Census taken 2010

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