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KEY CONCEPT Each population has a density, a dispersion, and a reproductive strategy.

KEY CONCEPT Each population has a density, a dispersion, and a reproductive strategy. Population density is the number of individuals that live in a defined area. Population density is a measurement of the number of individuals living in a defined space.

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KEY CONCEPT Each population has a density, a dispersion, and a reproductive strategy.

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  1. KEY CONCEPT Each population has a density, a dispersion, and a reproductive strategy.

  2. Population density is the number of individuals that live in a defined area. • Population density is a measurement of the number of individuals living in a defined space. • Scientists can calculate population density.

  3. Clumped dispersion Uniform dispersion Random dispersion Geographic dispersion of a population shows how individuals in a population are spaced. • Population dispersion refers to how a population is spread in an area.

  4. clumped • There are three types of dispersion.

  5. uniform • There are three types of dispersion.

  6. random • There are three types of dispersion.

  7. Survivorship curves help to describe the reproductive strategy of a species. • A survivorship curve is a diagram showing the number of surviving members over time from a measured set of births.

  8. 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 can be type I, II or III. • Type III—very high birth rate, very high infant mortality • common to invertebrates and plants

  9. Which of the following describes the density of a population? • 5 sloths dispersed randomly • 100 people in the area • 100 wolves per square mile • 1 acre per family

  10. The way in which individuals of a population are spread out is called • Population density • Population dispersion • Survivorship • Predation

  11. Zebra herds that live and move together are an example of what type of dispersion? • Clumped dispersion • Uniform dispersion • Random dispersion • Territorial dispersion

  12. What does a survivorship curve show? • The number of births and deaths each year. • The number of predators that fed on a species’ eggs • The number of offspring born in a particular year • The number of offspring still alive over time

  13. Most mammals have type 1 survivorship curves, which means they have • low infant mortality rate • Roughly equal survivorship rates at all ages • High numbers of offspring so that a few will survive • High levels of predation and uniform dispersion

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