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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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22371 news items

Caribbean360.com (subscription)

Caribbean360.com (subscription)
Wed, 27 Jan 2016 02:30:00 -0800

KINGSTON, Jamaica, Wednesday January 27, 2016 – Minister of Tourism and Entertainment Dr. Wykeham McNeill says Jamaica has been welcoming more visitors every year than the size of its population. For the past two years, the island has seen around ...
 
CNN
Fri, 12 Feb 2016 20:07:30 -0800

The rally included scientists, amateur scientists, schoolchildren and even the U.S. ambassador to Kenya. "So we're going to get a very accurate estimate of the population size in a particular area. Then we're going to aggregate this for Kenya, and for ...

Sydney Morning Herald

Sydney Morning Herald
Thu, 11 Feb 2016 13:56:15 -0800

"More than one-third of Australians have seen both Australia, and the world, double in population size in their lifetime," says Mr McCrindle, the principal of social research firm, McCrindle. Despite recent population growth, Australia accounts for ...

FOX40

FOX40
Fri, 12 Feb 2016 21:28:49 -0800

The rally will help in estimating population size. “So we're going to get a very accurate estimate of the population size in a particular area. Then we're going to aggregate this for Kenya, and for the first time we're going to know how many Grevy's ...
 
Huron Daily Tribune
Fri, 12 Feb 2016 21:15:00 -0800

"Population size: It's all about input and output," Carter said. If Bloomington wants to again consider controlling the deer population, Carter believes the research will help city officials be able to choose the method that will work best. "There are ...

The Advocate

The Advocate
Sat, 13 Feb 2016 09:03:45 -0800

Only six other states have entered more DNA samples in a federally managed nationwide database, according to FBI figures, and Louisiana has a dramatically higher proportion of DNA profiles in the database for its population size compared with any other ...

Arizona Daily Star

Arizona Daily Star
Fri, 12 Feb 2016 22:33:45 -0800

MALCOM, Neb. (AP) — The Lancaster County Sheriff's Office says a man mistaken to be impersonating a law enforcement officer was actually a volunteer firefighter investigating a car fire in Malcolm. Sheriff Terry Wagner said firefighters were looking ...

Asia Times

Asia Times
Sat, 13 Feb 2016 04:44:42 -0800

90, far below Palau (60) and Iran (69), questions arise if the U.N methodology has accurately worked out development versus population size ratio. This index or that, India's economic development — as has been consistently projected in recent years ...
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