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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]

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Population_size — Please support Wikipedia.
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The Japan Times
Wed, 04 Mar 2015 12:26:15 -0800

Despite Prime Minister Shinzo Abe's focus on revitalizing regional economies, growth remains uneven across Japan — with the pace of recovery slow the past year in municipalities with smaller populations, a Kyodo News survey showed Wednesday.

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The world's rarest cat, the Amur leopard, is increasing in number, according to new census data that found there are now 65 to 69 of these big cats in the wild versus 30 reported in 2007. The increase, which doubles the Amur leopard's known population, ...

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Wed, 04 Mar 2015 23:01:53 -0800

Modesto, Calif., and Spokane, Wash., both increased in population size but decreased in density because of annexation of land area. Modesto gained almost 3,800 people between 2010 and 2013 but decreased in population density by 837.6 people per ...
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Thu, 05 Mar 2015 01:44:04 -0800

Australian faces the challenge of a growing and ageing population that's expected to reach nearly 40 million by 2055 with nearly a quarter of that over the age of 65, according to the latest Intergenerational Report.
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Thu, 19 Feb 2015 12:25:21 -0800

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