POPULATION DENSITY (in agriculture : standing stock and standing crop ) is a measurement of population per unit area or unit volume; it is a quantity of type number density . It is frequently applied to living organisms , and most of the time to humans . It is a key geographical term.
* 1 Biological population densities
* 1.1.1 By political boundaries * 1.1.2 Other methods of measurement
* 2 See also
* 2.1 Lists of entities by population density
* 3 References * 4 External links
BIOLOGICAL POPULATION DENSITIES
Low densities may cause an extinction vortex and lead to further reduced fertility. This is called the Allee effect after the scientist who identified it. Examples of the causes in low population densities include:
* Increased problems with locating sexual mates * Increased inbreeding
HUMAN POPULATION DENSITY
For humans , population density is the number of people per unit of area, usually quoted per square kilometer or square mile (which may include or exclude, for example, areas of water or glaciers). Commonly this may be calculated for a county , city , country , another territory or the entire world .
The world\'s population is around 7,500,000,000 and
Several of the most densely populated territories in the world are city-states , microstates and dependencies . These territories have a relatively small area and a high urbanization level, with an economically specialized city population drawing also on rural resources outside the area, illustrating the difference between high population density and overpopulation .
Cities with high population densities are, by some, considered to be
overpopulated, though this will depend on factors like quality of
housing and infrastructure and access to resources. Most of the most
densely populated cities are in
In comparison, based on a world population of seven billion, the
world's inhabitants, as a loose crowd taking up ten square feet (one
square metre) per person (
Jacobs Method ), would occupy a space a
little larger than
By Political Boundaries
With population above 1,000,000 RANK COUNTRY/REGION POPULATION AREA (KM2) Density (Pop. per km2)
With population above 10,000,000 RANK COUNTRY/REGION POPULATION AREA (KM2) Density (Pop. per km2)
9 Burundi 10,114,505 27,834 363
Other Methods Of Measurement
Although arithmetic density is the most common way of measuring population density, several other methods have been developed to provide a more accurate measure of population density over a specific area.
* ARITHMETIC DENSITY: The total number of people / area of land (measured in square miles or square kilometers ). * PHYSIOLOGICAL DENSITY : The total population / area of arable land . * AGRICULTURAL DENSITY: The total _rural_ population / area of arable land . * RESIDENTIAL DENSITY: The number of people living in an urban area / area of residential land. * URBAN DENSITY : The number of people inhabiting an urban area / total area of urban land. * ECOLOGICAL OPTIMUM: The density of population that can be supported by the natural resources.