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14.3 Population Density and Dist.

14.3 Population Density and Dist. KEY CONCEPT Each population has a density, a dispersion, and a reproductive strategy. Clumped dispersion. Uniform dispersion. Random dispersion. Geographic dispersion of a population shows how individuals in a population are spaced.

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14.3 Population Density and Dist.

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  1. 14.3 Population Density and Dist. KEY CONCEPT Each population has a density, a dispersion, and a reproductive strategy.

  2. Clumped dispersion Uniform dispersion Random dispersion Geographic dispersion of a population shows how individuals in a population are spaced. 14.3 Population Density and Distribution. • Population dispersion refers to how a population is spread in an area.

  3. 14.3 Population Density and Dist. • Population dispersion • clumped

  4. 14.3 Population Density and Dist. • Population dispersion • uniform

  5. 14.3 Population Density and Dist. • Population dispersion • random

  6. 14.4 Population Growth Patterns KEY CONCEPT Populations grow in predictable patterns.

  7. 14.4 Population Growth Patterns • Changes in a population’s size are determined by immigration, births, emigration, and deaths. • Four factors affect the size of a population. • immigration • births • emigration • deaths

  8. 14.4 Population Growth Patterns • Population growth is based on available resources. • Exponential growth is a rapid population increase due to an abundance of resources.

  9. 14.4 Population Growth Patterns Population growth is based on available resources. • Logistic growth is due to a population facing limited resources.

  10. 14.4 Population Growth Patterns • Carrying capacity is the maximum number of individuals in a population that the environment can support. • A population crash is a dramatic decline in the size of a population over a short period of time.

  11. Ecological factors limit population growth. 14.4 Population Growth Patterns Ecological factors limit population growth. • A limiting factor is something that keeps the size of a population down. • Density-dependent limiting factors are affected by the number of individuals in a given area.

  12. 14.4 Population Growth Patterns • Density-dependent limiting factors are affected by the number of individuals in a given area. • predation • competition • parasitism and disease

  13. Predator-Prey Graph 14.4 Population Growth Patterns

  14. 14.4 Population Growth Patterns • Density-independent limiting factors limit a population’s growth regardless of the density. • unusual weather • natural disasters • human activities

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