4 factors that produce changes in population size
immigration
emigration
death rate
birth rate
Economy: availability of jobs
Changing climate: Rainfall,especially
Changes in weather: Hurricanes and flooding
Technical factors: discovery of birth control pills, or availability.
changes in Government policy: China's one child policy, tax deductions, child care provisions, and changes in things like family leave.
There are four major factors that can contribute to changes in population size. These factors are birth rate, death rate, immigration, and emigration.
1. Birth rate: The birth rate refers to the number of births per 1,000 individuals in a population over a specific period of time. It is an indicator of the rate at which individuals are added to the population. To determine the birth rate, you would need to collect data on the number of live births in a given period and divide it by the total population at the start of that period. This data can be obtained from government records, census data, or demographic surveys.
2. Death rate: The death rate, on the other hand, indicates the number of deaths per 1,000 individuals in a population over a specific period of time. It reflects the rate at which individuals are removed from the population. To calculate the death rate, you would need information on the number of deaths that occurred during a certain period and divide it by the total population at the start of that period. Similar to the birth rate, this data can be obtained from official records or demographic surveys.
3. Immigration: Immigration refers to the movement of individuals from one population to another. It increases the size of a population as individuals from outside areas join the population. To track immigration, you would need data on the number of individuals moving into the population from elsewhere. This information can be obtained from immigration records, census data, or relevant government agencies.
4. Emigration: Emigration, on the other hand, refers to the movement of individuals out of a population to settle in another area. It reduces the population size as individuals leave. To determine the emigration rate, you would need data on the number of individuals leaving the population and settling elsewhere. This data can be collected from official records, immigration statistics, or through population tracking surveys.
By analyzing the birth rate, death rate, immigration, and emigration, you can understand how these factors individually and collectively influence population size and dynamics.