Population Change
An increase or decrease in the size of a population. It is equal to (Births + Immigration) [[minus]] (Deaths + Emigration).
Birth Rate
Natality; Annual number of births per 1,000 people.
Death Rate
Mortality; Annual number of deaths per 1,000 people
Replacement Level Fertility
The number of children a couple must bear to replace themselves and keep the population steady
Total Fertility Rate
The average number of children a woman has during her childbearing years in a specific area
Life Expectancy
The average number of years an average person lives in a specific area
Infant Mortality Rate
The number of infants that die before age 1 per 1000
Age Structure
The proportion of the population at each age level
Demographic Transition
A change in the rates of population growth as industrialization occurs. Before the transition, both birth and death rates are high, resulting in a slowly growing population; then the death rate drops but the birth rate remains high, causing a population e
Doubling Time
The number of years it takes for a population to double; (rule of 70) doubling time equals 70 divided by percent growth rate. (ex. a population growing at 5% annually doubles in 70 � 5 = 14 years)
Growth Rate
Rate of increase or decrease of a population
Logistic Carrying Capacity
in terms of the logistic curve, the population size at which births equal deaths and there is no net change in the population
Logistic Growth Curve
a plot that shows how the initial exponential growth of a population is slowed and finally brought to a standstill by limiting factors
Population Dynamics
The study of changes in population sizes and the cause of these changes.
Zero Population Growth
when the birth rate equals the death rate