14 3 Population Density And Distribution KEY CONCEPT

14. 3 Population Density And Distribution KEY CONCEPT Each population has a density, a dispersion, and a reproductive strategy.

14. 3 Population Density And Distribution 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.

14. 3 Population Density And Distribution Geographic dispersion of a population shows how individuals in a population are spaced. • Population dispersion refers to how a population is spread in an Clumped area. dispersion Uniform dispersion Random dispersion

14. 3 Population Density And Distribution • There are three types of dispersion. – clumped

14. 3 Population Density And Distribution • There are three types of dispersion. – uniform

14. 3 Population Density And Distribution • There are three types of dispersion. – random

14. 3 Population Density And Distribution 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.

14. 3 Population Density And Distribution • 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

14. 3 Population Density And Distribution Which of the following describes the density of a population? A. B. C. D. 5 sloths dispersed randomly 100 people in the area 100 wolves per square mile 1 acre per family

14. 3 Population Density And Distribution The way in which individuals of a population are spread out is called A. B. C. D. Population density Population dispersion Survivorship Predation

14. 3 Population Density And Distribution Zebra herds that live and move together are an example of what type of dispersion? A. B. C. D. Clumped dispersion Uniform dispersion Random dispersion Territorial dispersion

14. 3 Population Density And Distribution What does a survivorship curve show? A. B. C. D. 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

14. 3 Population Density And Distribution Most mammals have type 1 survivorship curves, which means they have A. B. C. D. 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