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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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661 news items

Daily Record

Daily Record
Thu, 23 Oct 2014 04:26:15 -0700

That's the optimal population size we're now looking to manage to over the coming years." Too much of a good thing? Though Nichols confirmed that there's a provision for the roundup and euthanization of thousands of geese every summer under the U.S. ...
Thu, 23 Oct 2014 20:56:15 -0700

A former aide to President Ronald Reagan wants a handful of Southern states to secede from the union and form a new country named for the late GOP hero. It may come to a shock to some Alabamians, however, that Douglas MacKinnon's vision of the ...
MIT Technology Review
Thu, 23 Oct 2014 12:06:49 -0700

They found, for example, that population size is significant. People in all regions are more likely to see disaster news from other large countries, probably because there are more likely to be immigrants from those large countries who provide demand ...

Huffington Post

Huffington Post
Thu, 23 Oct 2014 11:22:30 -0700

The Electoral College is that Constitutionally mandated institution that makes sure that states get represented for being states, regardless of their population size. This movement would largely eliminate the power of states that lack large urban areas.
Albany Times Union
Wed, 22 Oct 2014 22:29:18 -0700

"The population size of a few hundred people is too small to be meaningful. A study will just be a whitewash," said Anne Rabe, a board member of United Neighbors Concerned About GE Dewey-Loeffel Landfill (UNCAGED). Rabe was among those who ...
Norwalk Reflector
Thu, 23 Oct 2014 21:18:45 -0700

New York officials say they have been operating under the assumption that an Ebola case would turn up here, because of the population size and the number of international flights arriving daily. About half of all passengers arriving in the United ...

The Conversation UK

The Conversation UK
Thu, 23 Oct 2014 22:48:45 -0700

Ross used equations to formalise the transmission process from mosquito to person and back again, and employed this framework to understand how the number of human infections was related to the mosquito population size. Since then mathematical ...

Queens Chronicle

Queens Chronicle
Thu, 23 Oct 2014 09:30:00 -0700

This commission will be banned from drawing districts to favor any incumbents, candidates or parties and will be required to provide a thorough explanation of any districts that are not of equal population size. This commission will also be politically ...

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