Biology lesson 08-Populations - Populations and Population Dynamics Populations refer to the total number of individuals of a given species in a given

# Biology lesson 08-Populations - Populations and Population...

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Populations and Population Dynamics - Populations refer to the total number of individuals of a given species in a given area. If we consider humans, for example, our population is growing exponentially! (See fig. 1, p. 38). In general, population size is based on four factors: Natality (births): How many new individuals are born in one year Mortality (Deaths): How many individuals that die in a year Immigration: The number of individuals from one geographic area that move INTO our area, and
Emigration: The number of individuals that move OUT of our geographic area to another. Population growth can be calculated using the following formula: Population = [Births + Immigration] - [Deaths +Emigration] Representing Populations : To represent populations, we usually plot a “Population Histogram” (see fig. 2, p. 39). Males are usually represented on the left; females on the right. The individuals are grouped into “bins” based on age.