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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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Population Size

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723 news items

On Line opinion
Tue, 25 Mar 2014 16:37:30 -0700

If there's one thing that's really big in the population size debate, it's the size of the scare campaigns made by both sides. One side tells us that a big Australia is a 'catastrophe', while the other says that slow population growth will hurt share ...

the Diplomat

The Economist
Wed, 16 Apr 2014 08:00:24 -0700

Rather than try to control population size, the central government would do better to have a go at curbing the spatial expansion of cities. Local bureaucrats have a predilection for vast areas of concrete. Plazas, broad boulevards and colossal airports ...
The Missoulian
Thu, 10 Apr 2014 07:10:51 -0700

“Data on each of these aspects of wolf population size will give us a very solid assessment of the effects of harvest on wolf populations in Montana,” Gude said. By adding additional harvest information, Gude said specific predictions of the effects of ...
EurekAlert (press release)
Thu, 24 Apr 2014 10:48:45 -0700

Doyle used the genome to identify thousands of genetic markers that together could act as a DNA "fingerprint," allowing researchers to distinguish individual birds, follow them in a population and determine population size and flux, parentage and ...
Thu, 24 Apr 2014 20:33:45 -0700

It's that high population size that sets the Rasberry Crazy Ant, also known as the Tawny Crazy Ant, apart from other ant species. “Crazy ants have these incredibly high populations, and so as a nuisance pest, they are pretty amazing,” Dr. Blake Bextine ...
Brandon Sun
Thu, 17 Apr 2014 16:23:26 -0700

"It's clear that the kind of management that they would invoke for protection of livestock hasn't worked in the past and it won't work now," he said, while also disputing the methods used to estimate the population size. "They're making the invalid ...

National Science Foundation (press release)

National Science Foundation (press release)
Thu, 24 Apr 2014 11:11:15 -0700

"The huge population size of Prochlorococcus suggests that this remarkable diversity and the way it is organized is not random, but is a masterpiece product of natural selection." Chisholm and Kashtan say the evolutionary and ecological distinction ...

The Guardian Charlottetown

The Guardian Charlottetown
Thu, 24 Apr 2014 09:51:31 -0700

The association will begin research on Atlantic halibut by tagging healthy fish to understand whether Atlantic Halibut in the Southern Gulf are a distinct meta-population and to further understand the population size, vital life history and emigration.

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