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KEY CONCEPT Populations grow in predictable patterns.

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KEY CONCEPT Populations grow in predictable patterns.

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  1. The student is expected to:11B investigate and analyze how organisms, populations, and communities respond to external factors; 12A interpret relationships, including predation, parasitism, commensalism, mutualism, and competition among organisms;12D recognize that long-term survival of species is dependent on changing resource bases that are limited

  2. KEY CONCEPT Populations grow in predictable patterns.

  3. 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

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

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

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

  7. 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.

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

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

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