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How Populations Grow

Explore how ecologists study populations, factors influencing population growth, exponential and logistic growth patterns, geographic range, density, growth rates, and age structure. Understand births, deaths, immigration, emigration in bacterial populations, and the concept of carrying capacity.

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How Populations Grow

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  1. How Populations Grow

  2. Learning Objectives • Explain the ways ecologists study populations. • Identify the factors that affect population growth. • Explain what happens during exponential growth. • Explain what happens during logistic growth.

  3. Describing Populations Geographic range Density and distribution • Growth rate • Age structure

  4. Geographic Range • The area inhabited by a population is called its geographic range.

  5. Density and Distribution

  6. Growth Rate Growth rate = 1 Population size is unchanged. Growth rate > 0 Population size is growing. Growth rate < 0 Population size is decreasing. Bacterial population

  7. Population Growth Births Emigration Immigration Deaths

  8. Exponential Growth Under ideal conditions with unlimited resources, a population will grow exponentially. Population is rapidly increasing.

  9. Logistic Growth When a population’s growth slows and then stops, following a period of exponential growth, it is called logistic growth. Phase II Phase III Phase I

  10. Carrying Capacity The maximum number of individuals of a particular species that a particular environment can support Population stabilizes at carrying capacity.

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