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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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10302 news items

UT The Daily Texan

UT The Daily Texan
Tue, 10 Mar 2015 02:00:00 -0700

While the increase reported in the study would double the population size of Texas, the University's numbers would be unaffected, UT spokesperson Gary Susswein said. “The University would have to make a decision about how large the student body should ...
 
The Japan Times
Wed, 04 Mar 2015 12:26:15 -0800

Despite Prime Minister Shinzo Abe's focus on revitalizing regional economies, growth remains uneven across Japan — with the pace of recovery slow the past year in municipalities with smaller populations, a Kyodo News survey showed Wednesday.
 
Women of China
Fri, 06 Mar 2015 04:33:45 -0800

Beijing plans to control the size of its population and to have no more than 23 million people by 2020, said a national legislator and senior Beijing official on March 6. Beijing municipal deputy mayor Li Shixiang, also a deputy to the nation's top ...

Al Jazeera America

Al Jazeera America
Sun, 29 Mar 2015 06:52:30 -0700

... species in the Sweetwater area — is not endangered, the eastern diamondback, hunted in a Whigham, Georgia, roundup, is; there is also plenty of evidence that both climate change and shrinking habitats are having a negative impact on population size.

ESPNcricinfo.com

ESPNcricinfo.com
Sat, 28 Mar 2015 02:36:19 -0700

Very similar population size to Sri Lanka and spread a lot thinner because we have our hands in many, many, many sports, all of which we seem to punch above our weight in. Don't get me wrong, we all have a soft spot for New Zealand, it's hard not to ...

Starr 103.5 FM

Starr 103.5 FM
Sun, 29 Mar 2015 06:07:30 -0700

The report is not clear if the rise is due to natural population size or the conflict in the northeast. Egypt has had a challenging period since the ouster of longtime leader Hosni Mubarak, but more Senegalese made protection requests last year than ...
 
MarketWatch
Tue, 24 Mar 2015 09:01:04 -0700

American UHNW individuals worth more than $500 million grew faster than all other UHNW wealth tiers in terms of population size and wealth. These 2,031 individuals are worth US$3.3 trillion, and account for a third of the total UHNW wealth of the ...
 
Practical Ethics (blog)
Thu, 19 Mar 2015 19:01:11 -0700

How should we compare a decrease in average quality of life with a gain in population size? Population ethics is a rigorous investigation of the value of populations, where the populations in question contain different (numbers of) individuals at ...
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