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Population density (in agriculture: standing stock or plant density) is a measurement of population per unit land area. It is mostly applied to humans , but sometimes to other living organisms too. It is a key geographical term.
Population density (people per km 2) by country This is a list of countries and dependencies ranked by population density , sorted by inhabitants per square kilometre or square mile . The list includes sovereign states and self-governing dependent territories based upon the ISO standard ISO 3166-1 .
Map of world population density in 1994 Map of world population density in 2005. Since its inception, population geography has taken at least three distinct but related forms, the most recent of which appears increasingly integrated with human geography in general.
One definition of population density: 0–350/km 2 is low 350–700/km 2 is medium 700+/km 2 is high . In sociology and population geography, population refers to a group of human beings with some predefined feature in common, such as location, race, ethnicity, nationality, or religion. [citation needed]
Behavioral sink" is a term invented by ethologist John B. Calhoun to describe a collapse in behavior that can result from overpopulation. The term and concept derive from a series of over-population experiments Calhoun conducted on Norway rats between 1958 and 1962. [1]
The 2012 census recorded a population of 10,515,973. [236] The population is young: in the 2012 census, 43.3% of the population were aged 15 and under, and 53.4% were between 16 and 64. [237] According to the CIA World Factbook, the annual birth rate is estimated at 40.2 births per 1,000 inhabitants in 2015, and the death rate at 14.9. [73]
The term "megacity" entered common use in the late 19th or early 20th centuries; one of the earliest documented uses of the term was by the University of Texas in 1904. [14] Initially the United Nations used the term to describe cities of 8 million or more inhabitants, but now uses the threshold of 10 million. [ 15 ]
In biology, overabundant species refers to an excessive number of individuals [1] and occurs when the normal population density has been exceeded. Increase in animal populations is influenced by a variety of factors, some of which include habitat destruction or augmentation by human activity, the introduction of invasive species and the reintroduction of threatened species to protected reserves.