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Section 14-3 and 14-4 “Population”

Section 14-3 and 14-4 “Population”. Write everything that is underlined. Section 14.3 KEY CONCEPT: Each population has a density, a dispersion, and a reproductive strategy. Populations Population density is a measurement of the number of individuals living in a defined space .

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Section 14-3 and 14-4 “Population”

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  1. Section 14-3 and 14-4“Population” Write everything that isunderlined

  2. Section 14.3 KEY CONCEPT: Each population has a density, a dispersion, and a reproductive strategy.

  3. Populations • Population density is a measurement of the number of individuals living in a defined space. • Population dispersion refers to how a population is spread in an area. • There are three types of dispersion illustrated on the next slides:

  4. a. clumped

  5. b.uniform

  6. c. random

  7. Type I: low level of infant mortality and an older population • common to large mammals and humans • Type II: survivorship rate is equal at all stages of life • common to birdsand reptiles • Survivorship curves: • Type III: very high birth rate, very high infant mortality • common to invertebrates and plants

  8. Section 14.4 KEY CONCEPT: Populations grow in predictable patterns.

  9. Population Growth • The size of a population is always changing. • Four factors affect the size of a population: • Births • Deaths • Immigration • (Moving into an area) • Emigration • (Moving out of an area)

  10. Exponential growth is a rapid population increase due to an abundance (lots of) of resources.

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

  12. Carrying capacity is the maximum number of individuals in a population that the environment can support. • This is due to limited resources (food, shelter, space)

  13. A population crash is a dramatic decline in the size of a population over a short period of time.

  14. A limiting factoris something that keeps the size of a population down. • Limiting factors can depend on the density of individuals in the population or not.

  15. Density-dependentlimiting factors are affected by the number of individuals in a given area. • Predation • Competition • Parasitism and disease

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

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