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 yearMortality (Deaths):How many individuals that die in a yearImmigration:The number of individuals from one geographic area that move INTO our area, and
Emigration:The number of individuals that move OUT ofour 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.