The four factors that can affect population size are fertility rate, mortality rate, immigration and emigration. Fertility rate and mortality rate are often grouped together as are immigration and emigration.
The fertility rate of a population refers to the average amount of children that women have throughout their lifetime, adjusted to births per certain amount of the population in the year. The opposing factor to fertility rate is mortality rate, which is equal to the typical amount of deaths per the same amount of the population in the year. Finally, immigration is a count of how many foreigners become residents of the country, while emigration is a count of how many residents leave the country.Learn More
There are five main characteristics of a population and these include population size, population density, population distribution, age structure and reproductive base. These characteristics of a population can be found in population ecology, which is a combination of the study of how organisms interact with each other and their environment focusing on the group of individuals of the same species, most often humans in population ecology, who live in a given area.Full Answer >
The main difference between density-dependent factors and density-independent factors is that density-dependent factors affect only populations of certain sizes while density-independent factors affect populations in the same way, regardless of population size. Factors dependent on population density include illness, parasitism and scarcity of resources, while density-independent factors include weather phenomena, natural disaster and human activities, such as damming rivers and clearing forest areas and plains.Full Answer >
Demographic factors are personal characteristics are used to collect and evaluate data on people in a given population. Typical factors include age, gender, marital status, race, education, income and occupation. Governments use analysis of the demographics makeup in a population to plan strategies and ongoing public service programs.Full Answer >
In reference to population, push and pull factors are the reasons and conditions that drive people from one geographic area and pull them to another, according to The Levin Institute. An example of a push factor is the inability to earn a living wage in a location or country. A corresponding example of a pull factor is the promise of jobs and financial security in another location.Full Answer >