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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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11007 news items

 
Forbes
Mon, 22 Jun 2015 05:45:00 -0700

Paul Krugman has a piece today looking at the influence of America's racial make up on the existence and size of the US welfare state. Given that I'm an extremely whitebread European this specific aspect of it all isn't something I can discuss very well.

BBC News

BBC News
Thu, 25 Jun 2015 01:39:40 -0700

Population Matters, which researches the environmental impact of population size, said the growth is having an impact on quality of life. "We are all affected adversely by the rapid population growth of recent decades," said chief executive Simon Ross.
 
Economic Times
Tue, 07 Jul 2015 16:37:30 -0700

Two days from now leaders of the five most powerful emerging market economies will gather in Russia to discuss and debate the global economic landscape and increased cooperation between the member countries. The annual BRICS summit will bring ...
 
Turf Show Times
Tue, 07 Jul 2015 12:30:00 -0700

In February, the NFL commissioned a study (from Conventions, Sports & Leisure International) to gauge some important financial aspects of the St. Louis market and the region as a whole as it pertains to the ongoing effort from Governor Jay Nixon's task ...
 
WKMG Orlando
Mon, 06 Jul 2015 20:02:20 -0700

TONIGHT UCF POLICE ARE HANDLING CRIME OFF-CAMPUS WITH ORANGE COUNTY SHERIFF'S DEPUTIES. WITH THE POPULATION SIZE ABOUT THE SIZE OF DAYTONA BEACH UCF POLICE HAS ITS HANDS FULL. MIKE HOLFELD ROAD WITH ...
 
Midland Daily News
Tue, 07 Jul 2015 07:26:15 -0700

“For example, you won't see a lot of groups that separate metros by population size and I think it tells a better story.” Engle was not aware there was a Midland in Michigan before the study was completed, and said he pulled some data and found that ...
 
New Zealand Herald
Sat, 04 Jul 2015 15:05:07 -0700

Auckland's large population, size and connections to multi-national businesses make it more similar to Melbourne and Sydney than Wellington and Christchurch. Photo / Thinkstock. Auckland house price growth is more similar to Sydney, Melbourne or ...
 
Communication Research Institute
Tue, 07 Jul 2015 13:15:00 -0700

Klatt says Oskaloosa met the criteria of population size and distance when choosing a community for the event. Klatt says football ticket sales slightly dipped at the university this year. However, Iowa is still in the Top 25 in attendance in the ...
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