Chapter 5 Populations 5-1 How Populations Grow

KWL What are three things you want to know about population growth? What do you know about population growth?

How Populations Grow Characteristics of Populations Three important characteristics of a population geographic distribution Density growth rate

Geographic Distribution Geographic distribution, or range, is a term that describes the area inhabited by a population.

Population Density Population density is the number of individuals per unit area. The population of saguaro cactus in the desert plant community has a low density, whereas other plants in that community have a relatively high density.

Populations Growth Population Growth Three factors can affect population size: Birth Rate-number of births Death Rate-the number of deaths the number of individuals that enter or leave the population. * Simply put, a population will increase or decrease in size depending on how many individuals are added to it or removed from it

Immigration & Emmigration the movement of individuals into an area, is another factor that can cause a population to grow. Emigration the movement of individuals out of an area, can cause a population to decrease in size.

Word Origin Immigration is formed from the Latin prefix in-, meaning “in,” and migrare, meaning “to move from one place to another. If the Latin prefix e- means “out,” then which of the following means “migration out”? A.) emigration B.) migration C.) Immigration

Carrying Capacity Carrying Capacity The number or the largest number of individuals that a given environment can support.