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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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11000 news items

Crain's Chicago Business

Crain's Chicago Business
Mon, 14 Sep 2015 04:48:45 -0700

(Reuters) — Hidden in the haze of the petrochemical plants and beyond the seemingly endless traffic jams, a Texas city has grown so large that it is poised to pass Chicago as the third biggest in the United States in the next decade. Houston has been ...

Daily Herald

Daily Herald
Sat, 03 Oct 2015 17:56:15 -0700

“There are businesses that I can't talk about that were interested and now that is done, they are still interested.” In 2013, CNN Money found Eagle Mountain as the youngest city in the nation with its population size — 26,000. In 1996, there were 250 ...

Springfield News-Leader

Springfield News-Leader
Tue, 22 Sep 2015 13:37:30 -0700

Population size is a neglected component of the immigration debate despite U.S. and world overpopulation and continued growth. For example, the world had 4.5 billion people in 1981 and was growing by 80 million per year; it has 7.3 billion today and is ...

Washington Examiner

Washington Examiner
Sat, 03 Oct 2015 21:18:45 -0700

The Supreme Court will decide whether partisan political motivation may invalidate a redistricting plan with minor deviations in population size and, if so, whether such motivations must be the primary reason for the state's line-drawing, or only a ...

County 10

County 10
Sat, 03 Oct 2015 06:52:30 -0700

Other threats continue to hamper recovery efforts, including a lack of suitable reintroduction sites and a small population size. The Final Recovery Plan is designed to address these threats, with the end goal of creating self-sustaining populations ...
South Whidbey Record (subscription)
Sat, 03 Oct 2015 05:56:15 -0700

City Hall has yet to release an official estimate of population size, though McCarthy offered a guess of about 250 in an interview with The Record this week. That number was based on his personal count of about 125, which he doubled per an expert's ...
Tue, 29 Sep 2015 05:56:15 -0700

US immigration trends shifted dramatically between 1850 and 2013 —including changes in the dominant countries of origin for each state and decade, and the total size of foreign-born population — according to a new series of historical maps from the ...


Wed, 30 Sep 2015 09:18:45 -0700

But the post is flawed on many levels. The comparison based on similar population size alone is shallow, and non-scientific. Moreover, Switzerland does not have the world's lowest homicide level, and the post is flatly wrong about the laws in each country.

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