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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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10585 news items

 
Nature.com
Wed, 26 Aug 2015 02:11:15 -0700

Neutral theory posits that genetic diversity will increase with a larger effective population size and the decreasing effects of drift. However, the lack of compelling evidence for a relationship between genetic diversity and population size in ...

The Advocate

The Advocate
Sun, 30 Aug 2015 19:15:00 -0700

... according to the U.S. Centers for Disease Control and Prevention's Sexually Transmitted Disease Surveillance. The report uses both the number of cases and the population size to determine rankings, which are based on the number of people diagnosed ...

Ashland Daily Press

Ashland Daily Press
Sun, 30 Aug 2015 17:11:15 -0700

They are going through potentially a 90 percent decrease in their population size and that's attributed to habitat loss, climate change and pesticide use. “The habitat loss is pretty crucial because as caterpillars they eat exclusively milkweed and so ...

Asbarez Armenian News

Asbarez Armenian News
Fri, 28 Aug 2015 11:33:45 -0700

Asia will see a likely reduction of its total population size. Europe will suffer a decrease, with 646 million people by 2100. The fastest-growing region is Africa, where population is projected to reach 4.4 billion. Population growth in Turkey and ...

Cars.com News

Cars.com News
Sun, 30 Aug 2015 20:56:15 -0700

Generally speaking, a common factor among the best states for drivers was a lesser population size and density. In the top five, Idaho was joined by Vermont, Wyoming, Wisconsin and Minnesota. "The best states for drivers have lots of wide-open spaces, ...
 
Buffalo Bulletin
Fri, 28 Aug 2015 14:11:15 -0700

The sage-grouse habitat spans 11 Western states. The report shows an increase in male sage-grouse populations. Researchers use the number of males per lek, or breeding ground, to extrapolate overall population size. The report indicates an upward trend ...
 
PR Newswire (press release)
Tue, 25 Aug 2015 02:00:00 -0700

It ranks 18th among European nations in terms of UHNW population size, according to the same report. Alex Story, Wealth-X's Head of Business Development, Germany and Austria commented: "With the summer holiday coming to an end, ambitious students ...
 
Alabama News Network (press release)
Sun, 30 Aug 2015 20:56:15 -0700

Pike Road School is the only one in the town of Pike Road, but because of the student population size Mayor Stone does not think it will be the only school in the community for long. "Right now we have about eleven hundred plus in this building," Mayor ...
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