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In population genetics and population ecology, population size (usually denoted N) is the number of individual organisms in a population.

The effective population size (Ne) is defined as "the number of breeding individuals in an idealized population that would show the same amount of dispersion of allele frequencies under random genetic drift or the same amount of inbreeding as the population under consideration." Ne is usually less than N (the absolute population size) and this has important applications in conservation genetics.

Small population size results in increased genetic drift. Population bottlenecks are when population size reduces for a short period of time.

Overpopulation may indicate any case in which the population of any species of animal may exceed the carrying capacity of its ecological niche.

See also[edit]

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730 news items

The Online Citizen

The Online Citizen
Thu, 31 Jul 2014 18:30:25 -0700

In October 2012, Prime Minister Lee Hsien Loong said Singapore could accommodate a population size of “6 million or so” people. However, former Prime Minister Lee Kuan Yew, said in 2008 that he is “not quite sold” on a larger population of 6.5 million.
Business Mirror
Wed, 27 Aug 2014 05:00:00 -0700

The best situation would probably be for a nation to reach an ideal population size and then to balance the birth and death rate. But this sort of social engineering is difficult, at best, and often has unintended consequences. During the leadership of ...

New Vision

New Vision
Wed, 27 Aug 2014 22:43:38 -0700

"There are villages that cannot be covered by one enumerator and we have divided them into several enumeration areas depending on the population size. We have between 15 to 25 enumerators for each zone in Kampala because of the high population," ...

The New Republic

The New Republic
Wed, 13 Aug 2014 14:58:57 -0700

Generally, police forces get less diverse as you move down in population size. Of course, these are just averages and they do not take into account the diversity of the cities themselves. Research also suggests, though, that representation makes a ...

Daily Caller

Daily Caller
Wed, 27 Aug 2014 08:45:00 -0700

“We have at least two reports in the peer-reviewed literature that state flat-out that the presumed negative effects of declining sea ice on a population's size are indistinguishable from a population that is as large as it can get,” Dr. Susan J ...
Wisconsin Gazette
Tue, 26 Aug 2014 12:07:30 -0700

Monarchs need a large population size to be resilient to threats from severe weather events and predation. Nearly half of the overwintering population in Mexico can be eaten by bird and mammal predators in any single winter; a single winter storm in ...
MyNews3 Las Vegas KSNV
Wed, 27 Aug 2014 23:21:40 -0700

Using data from claims and accident reports, the study ranks 200 cities taking into account factors like distracted driving, weather conditions and population size all of which Hawley says can contribute to accidents. "We have a lot of drivers and a ...


Fri, 22 Aug 2014 09:30:16 -0700

Lagos, Nigeria is expected to nearly double in population size between 2015 and 2030 to 24 million inhabitants. Cairo, Egypt will add 6 million more people during the same period, reaching a total of 25 million. Those are only two cities. The report is ...

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