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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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699 news items

Pew Research Center
Mon, 21 Jul 2014 04:03:45 -0700

In trying to identify the factors that might explain the size of a statehouse press corps, Pew Research looked at a number of demographic variables, including population size, income and education levels, age, race and ethnicity, percentage of ...
Automated Trader (blog)
Mon, 21 Jul 2014 18:18:45 -0700

The opinions expressed by this blogger and those providing comments are theirs alone, this does not reflect the opinion of Automated Trader or any employee thereof. Automated Trader is not responsible for the accuracy of any of the information supplied ...
Wed, 09 Jul 2014 18:50:24 -0700

Many, if not most Vermonters, think that population size and growth is primarily a world problem, maybe a U.S. problem, but certainly, being a rural state, not a Vermont concern. In fact economists and developers keep on saying that Vermont's ...

Solar News PH

Solar News PH
Tue, 29 Jul 2014 05:11:15 -0700

For Percival Cendana of the National Youth Commission, population size is not much of a problem as the young age of those giving birth, saying that 10 percent of mothers are teenagers. Cabral said while a growing population is not a problem, women ...
Wed, 23 Jul 2014 10:06:00 -0700

During the course of the study, the authors report a decline in population size of nearly 25%, and a per-generation increase in the heterozygosity of breeding females of 8.5%. The reason that these breeding animals are not producing more-heterozygous ...
Mon, 28 Jul 2014 04:42:15 -0700

If humanity ever wants to colonize a planet beyond the solar system, it's going to need a really big spaceship. The founding population of an interstellar colony should consist of 20,000 to 40,000 people, said Cameron Smith, an anthropologist at ...


Tue, 29 Jul 2014 20:56:15 -0700

The police department is funded by both entities based on population size. On Tuesday, County Commission Chairman Al Scott presented the city with a draft of a new agreement with several proposed changes, including reducing the $1.5 million the county ...

Cayman Compass

Cayman Compass
Tue, 29 Jul 2014 21:52:30 -0700

Also funded by the Darwin Initiative grant, the Department of Environment is completing comprehensive night surveys to refine estimates of wild turtle population size. The study will also attempt to identify the extent to which the thousands of turtles ...

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