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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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10079 news items

New Security Beat (blog)

New Security Beat (blog)
Mon, 26 Jan 2015 03:37:30 -0800

The goal was to demonstrate how several available sets of policies will likely influence fertility, mortality, and education trends, and in doing so, affect population size and societies' adaptive and mitigative capacities. “These pathways…are stories ...

Los Angeles Times

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Sun, 25 Jan 2015 05:01:13 -0800

The most recent report by the Intergovernmental Panel on Climate Change, the United Nations' board of climate experts, included concerns about population size, saying, “Globally, economic and population growth continued to be the most important drivers ...
 
Daily Yonder
Thu, 22 Jan 2015 04:00:00 -0800

Each dot charts a county on two coordinates: 1) the percentage of the population in the county that has access to broadband of 25 megabits per second or more (the horizontal axis) and 2) the percentage change in population size from 2010 to 2013 ...

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Tue, 27 Jan 2015 00:03:45 -0800

In effect, the combined Arab World despite its larger population size has been generating fewer intellectual strides than countries with significantly smaller populations. In fact, data collected from the SCImago Journal shows that Arab League ...

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Tue, 27 Jan 2015 05:52:30 -0800

Alas, it appears that efforts to bring U2 here have failed, assuming the band even considered San Diego in the first place. Why not? Tour routing is one issue. Money is another. So are population size and geographic areas. The Forum has a capacity of ...
 
Nature.com
Mon, 19 Jan 2015 09:41:17 -0800

STAMP analyzes the frequency changes of genetically 'barcoded' organisms to quantify population bottlenecks and infer the founding population size. Analyses of intraintestinal Vibrio cholerae revealed infection-stage and region-specific host barriers ...

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Thu, 15 Jan 2015 05:52:26 -0800

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