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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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10897 news items

NIU Newsroom

NIU Newsroom
Tue, 26 May 2015 07:37:30 -0700

If current trends continue, Joliet and Naperville, the fourth and fifth largest Illinois cities respectively, will surpass Rockford in population size within the next year or two, Taylor says. In terms of percentage population increases, the fastest ...

The Guardian

The Guardian
Tue, 26 May 2015 15:30:00 -0700

Population size has barely featured in their discussions. While protesters have risen up against Nestle and other bottled water manufacturers, the manufacturers themselves point out that their industry accounts for a tiny fraction of overall water use ...

BioNews Texas

BioNews Texas
Wed, 13 May 2015 07:48:45 -0700

In the study, researchers developed a new model-flexible method called the stairway plot, capable of determining changes in population size over time by modeling the frequency of single nucleotide polymorphisms (SNPs; correspond to a difference in a ...

EurekAlert (press release)

EurekAlert (press release)
Mon, 11 May 2015 05:56:15 -0700

A bottleneck is a period of time when the population size decrease significantly and then recovers. Bottlenecks can be explained by major events such as migration, environmental events, disease or war. Because there are fewer people left after a ...

Eurasia Review

Eurasia Review
Tue, 12 May 2015 10:23:52 -0700

A bottleneck is a period of time when the population size decrease significantly and then recovers. Bottlenecks can be explained by major events such as migration, environmental events, disease or war. Because there are fewer people left after a ...

Financial Times

Financial Times
Tue, 26 May 2015 08:33:45 -0700

Tokyo leads the pack — in population size, economic punch and number of corporate headquarters — ahead of New York, London and Paris. Cities only cover two per cent of the earth's surface, but they consume 78 per cent of the its energy and account ...

Mashable

Mashable
Mon, 25 May 2015 19:26:15 -0700

At A$10 a month, many customers will choose more than one service." With low prices like A$8.99 a month for Netflix and A$10 for Stan, Australia's relatively small population size must be a significant factor when SVOD services crunch the numbers.

Gizmodo Australia

Gizmodo Australia
Tue, 26 May 2015 17:35:49 -0700

The population of the Mornington Peninsula is usually around 154,000 residents but over the summer period can swell to a population size of 250,000. The area is only served by 96 taxis and limited public transport. This makes meeting the needs of the ...
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