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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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13140 news items

 
GenomeWeb
Mon, 06 Apr 2015 11:00:00 -0700

NEW YORK (GenomeWeb) – With a new method to infer population size changes from SNP data, a research duo from the University of Texas Health Science Center has examined fluctuations in human population size dating back tens of thousands of years.

Phys.Org

Phys.Org
Tue, 07 Apr 2015 07:10:04 -0700

(Phys.org)—A pair of researches with the University of Texas has used a new method to infer historical human population size fluctuations based on Single Nucleotide Polymorphism (SNP) data. In their paper published in the journal Nature Genetics, the ...

GlobeNewswire (press release)

GlobeNewswire (press release)
Mon, 27 Apr 2015 11:45:00 -0700

... according to the 2015 Global Population Speak Out (Speak Out) – an international campaign raising awareness about environmental degradation, health and human rights, and the many challenges presented by human population size and growth.
 
Valdosta Daily Times
Sun, 26 Apr 2015 00:05:04 -0700

“How far the human population size now is above the planet's long-term carrying capacity is suggested (conservatively) by ecological footprint analysis,” the Ehrlichs wrote in a 2012 Royal Society paper. "It shows that to support today's population of ...

New York Daily News

New York Daily News
Sun, 26 Apr 2015 02:00:00 -0700

Accounting for relative population size, black people died at the hands of Maryland police 10 times as often as white people. As Rev. Todd Yeary, political director of the Maryland NAACP, told me, "The Western District way is no longer limited to ...
 
Middle East Forum
Mon, 27 Apr 2015 08:33:45 -0700

... of numbers it offers are significant, although the text, after some paragraphs of convoluted remarks on these figures, avers that "violent extremist ideas in Kosovo are embraced by only a small group of people when compared to the overall ...

BurlingtonFreePress.com

BurlingtonFreePress.com
Wed, 15 Apr 2015 12:52:30 -0700

Vermont's population size and growth not only impacts Vermont's environment and water quality it also has an impact on the rest of the Earth as is documented by ecological footprint data, but again you never hear environmental leaders talking about this.

WWF International

WWF International
Tue, 07 Apr 2015 07:03:45 -0700

“The small population size and high calf mortality means these rare and beautiful dolphins are facing a highly uncertain future, but there is still hope for them. Joint conservation action between both countries is paramount,” said Teak Seng, WWF ...
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