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14.3 Population Density And Distribution TEKS 7D, 12A The student is expected to: 7D analyze and evaluate how the elements of natural selection, including.

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Presentation on theme: "14.3 Population Density And Distribution TEKS 7D, 12A The student is expected to: 7D analyze and evaluate how the elements of natural selection, including."— Presentation transcript:

1 14.3 Population Density And Distribution TEKS 7D, 12A The student is expected to: 7D analyze and evaluate how the elements of natural selection, including inherited variation, the potential of a population to produce more offspring than can survive, and a finite supply of environmental resources, result in differential reproductive success; 12A interpret relationships, including predation, parasitism, commensalism, mutualism, and competition among organisms

2 14.3 Population Density And Distribution TEKS 7D, 12A KEY CONCEPT Each population has a density, a dispersion, and a reproductive strategy.

3 14.3 Population Density And Distribution TEKS 7D, 12A 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.

4 14.3 Population Density And Distribution TEKS 7D, 12A Population dispersion refers to how a population is spread in an area. Geographic dispersion of a population shows how individuals in a population are spaced. Clumped dispersion Uniform dispersion Random dispersion

5 14.3 Population Density And Distribution TEKS 7D, 12A There are three types of dispersion. –clumped

6 14.3 Population Density And Distribution TEKS 7D, 12A There are three types of dispersion. –uniform

7 14.3 Population Density And Distribution TEKS 7D, 12A There are three types of dispersion. –random

8 14.3 Population Density And Distribution TEKS 7D, 12A 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.

9 14.3 Population Density And Distribution TEKS 7D, 12A Survivorship curves can be type I, II or III. –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 birds and reptiles –Type III—very high birth rate, very high infant mortality –common to invertebrates and plants

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