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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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Mon, 13 Jul 2015 14:33:45 -0700

“Large pools of interacting individuals can create and maintain adaptive skills, as well as phonological variation, more effectively than small populations, and they are also capable of faster cumulative cultural evolution. A decrease in population ...

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Wed, 29 Jul 2015 05:31:00 -0700

Brown says this study will help researchers improve their estimates of population size, by seeing how far the animals typically travel. “This will give us an idea of their home range size, which then you can use that to try to estimate their numbers ...


Wed, 29 Jul 2015 09:52:46 -0700

India will be the world's most populous country by 2022, according to the United Nations, overtaking China years earlier than previously thought. China is currently the largest country by population size with 19 per cent of the global population. India ...

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Fri, 10 Jul 2015 17:56:15 -0700

While Speak Out welcomes the Pope's concern about consumerism and its impact on the environment -- and strongly applauds his call to action on climate change -- the refusal of His Holiness to address the impacts that population size and growth are ...
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Tue, 28 Jul 2015 18:18:45 -0700

The selected health areas and corresponding clusters are presented in Additional file 1: Table S1. In a selected health area, one village/neighbourhood was randomly drawn when there was more than one regardless of the population size. The starting ...
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... of the six bobwhite management zones (East Central, North Central, Northeast, Republican, Southeast and West Platte). This excludes northwest Nebraska, which is not bobwhite range. The survey does not provide information on bobwhite population size ...

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Wed, 29 Jul 2015 11:45:00 -0700

In terms of total convictions Dublin is naturally enough the leader (given its population size) with 2,533. Less clear is why a far smaller county such as Donegal should come second with 864 convictions. Galway takes the bronze medal with 841. By ...

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Thu, 23 Jul 2015 04:03:59 -0700

Lehohla said Gauteng's population size has grown quite rapidly over the past four years. He said that in 2011 the province's population was 12.2 million and it now sits at 13.2 million, representing an increase of another million people over a period ...

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