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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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671 news items

Dubai Chronicle

Dubai Chronicle
Tue, 21 Oct 2014 11:45:00 -0700

If Windows 10 gathered together to form one country it would have the population size almost as big as that of Cyprus or even Bahrain. According to Microsoft, more than 1 million people are already using the preview version of Windows 10. In a blog ...


Tue, 21 Oct 2014 18:07:30 -0700

Portland also has both photo radar and red light cameras, yet Beaverton still issued 2.5 times more tickets than Portland in 2013, adjusted for population size. Proposed change in the law. Lawmakers and voters might want to take a close look at what's ...

National Geographic

National Geographic
Sat, 20 Sep 2014 10:36:01 -0700

These estimates are based on assumptions about existing population size and expectations of fertility, mortality, and migration in a geographic area. We've been on a big growth spurt during the past century or so. In 1900, demographers had the world's ...
Westword (blog)
Tue, 21 Oct 2014 10:48:45 -0700

At the time, the fish was facing threats that included "population fragmentation and isolation, small population size, non-native trout, drought, and fire." Non-native trout can replace or breed with native trout such as the Rio Grande, wiping them out ...
The Tri-City News
Tue, 21 Oct 2014 16:03:42 -0700

The study found Coquitlam ranked fifth in population among the 17 Metro cities studied and seventh in per-person spending ($1,393 — up nearly 50% from the $933/person spent in 2002). PoMo, 14th in population size, was the ninth biggest spender ($1,345 ...

WRGT TV Fox 45

WRGT TV Fox 45
Tue, 21 Oct 2014 16:48:45 -0700

... excellence in park and resource management, volunteerism, long range planning, and serving the community. The award is divided into five classes based on population size and has been bestowing the award since 1965. Kettering Parks Receive National ...

Huffington Post

Huffington Post
Tue, 21 Oct 2014 10:09:49 -0700

Safe, small-town America is being threatened: More than 25 towns across the U.S., no bigger than 25,000 in population size, now have MRAPs. As the American Civil Liberties Union reported this summer, war has come home to America and it is excessive.
Las Vegas Sun
Tue, 21 Oct 2014 02:05:27 -0700

There are very, very few departments that handle a large population size. These bigger departments have a high proportion of all the officers in the country, but most agencies are quite small and have departments staffed anywhere from 50 officers to ...

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