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KEY CONCEPT Populations grow in predictable patterns.

KEY CONCEPT Populations grow in predictable patterns. Changes in a population’s size are determined by immigration, births, emigration, and deaths. The size of a population is always changing. Four factors affect the size of a population. immigration births emigration deaths.

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KEY CONCEPT Populations grow in predictable patterns.

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  1. KEY CONCEPT Populations grow in predictable patterns.

  2. Changes in a population’s size are determined by immigration, births, emigration, and deaths. • The size of a population is always changing. • Four factors affect the size of a population. • immigration • births • emigration • deaths

  3. Population growth is based on available resources. • Exponential growth is a rapid population increase due to an abundance of resources.

  4. Logistic growth is due to a population facing limited resources.

  5. 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.

  6. 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.

  7. predation • competition • Density-dependent limiting factors are affected by the number of individuals in a given area. • parasitism and disease

  8. unusual weather • natural disasters • human activities • Density-independent limiting factors limit a population’s growth regardless of the density.

  9. The movement of a single caribou into a herd is called • Immigration • Emigration • Population • Competition

  10. What pattern of growth will a population with limited resources show? • Exponential • Logistic • Density-dependent • Density-independent

  11. The carrying capacity is most likely to change • If emigration take place • When resources remain the same • For all species at the same time • After a fire or flood

  12. Disease may spread more easily when an area is crowded, so disease is considered to be a • Type 1 survivorship curve • Population crasher • Density-dependent limiting factor • Requirement for logistic growth

  13. Which of the following is an example of a density-independent limiting factor? • A parasite • A decrease in prey • A food shortage • A natural disaster

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