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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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9951 news items

For Argyll

For Argyll
Fri, 28 Nov 2014 04:56:10 -0800

If data allows the estimate of the overall east coast population size, which in 2012 was 195 individuals, will also be updated. The report was produced by the University of Aberdeen, who have been carrying out research on the population since 1989, ...

The Independent

Tech Times
Wed, 29 Oct 2014 20:37:07 -0700

Ecologist Corey Bradshaw and Barry Brook looked into the question of whether or not reducing the global population size could help alleviate the effects of climate change, curb animal extinction, and solve other concerns involving the environment.

EurekAlert (press release)

EurekAlert (press release)
Fri, 07 Nov 2014 01:56:15 -0800

Starting with the latest estimate for a founding population of about 400 people (including 170-230 women), and applying population growth rates in the range achieved by past and present populations, the researchers modelled the human population size ...

Korea IT Times (press release)

Korea IT Times (press release)
Thu, 30 Oct 2014 18:07:30 -0700

SEOUL, KOREA - The Constitutional Court ruled that the current law on the population size of voting districts is in violation of the constitution and recommended the population disparity between the largest and the smallest constituency, a ratio of ...
Rock Hill Herald
Sun, 09 Nov 2014 11:00:56 -0800

"We are using 'DNA fingerprints' to not only estimate the population size, but to determine differences in abundance and distribution in the various regions of the state, and identify potential barriers to gene flow — the population's ability to move ...

Medical News Today

Medical News Today
Thu, 27 Nov 2014 07:00:00 -0800

A new report from the Royal Society in the UK uncovers the exposure of human populations to extreme weather, which the organization says is going to increase as changes in global climate and population size, location and age endure. Scientists from the ...
Fri, 28 Nov 2014 03:15:00 -0800

“Genetic diversity is an index of extinction and of population size,” explained Nakajima. “Higher genetic diversity means a healthy population, but decreasing genetic diversity means that the population kinship increases.” Kinship refers to mating ...

The News-Press

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Thu, 20 Nov 2014 18:15:00 -0800

“The number of roadkills we're seeing tracks closely with the trend in population size,” state panther biologist Mark Lotz said. “As the population increases, we're seeing a similar increase in roadkills: There are more panthers to get hit.” With a ...

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