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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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833 news items

Tech Times

Science Now
Mon, 27 Oct 2014 13:03:45 -0700

The duo obtained data on death rates, average family size (i.e., fertility), and regional population size from the World Health Organization and the U.S. Census Bureau International Data Base. They created a computer model that projects human ...

Practical Ethics (blog)

Practical Ethics (blog)
Thu, 30 Oct 2014 01:37:30 -0700

Another fundamental problem in theoretical population ethics is how to balance quality of life against population size. Many economists assume an average view, which ranks outcomes according to their average quality of life per person. This view faces ...

RedOrbit

RedOrbit
Tue, 28 Oct 2014 05:56:15 -0700

“Often when I give public lectures about policies to address global change, someone will claim that we are ignoring the 'elephant in the room' of human population size,” he continued. “Yet, as our models show clearly, while there needs to be more ...

TakePart

TakePart
Tue, 28 Oct 2014 15:33:19 -0700

The controversial silver bullet of population control appears to be a blank. "Often when I give public lectures about policies to address global change, someone will claim that we are ignoring the 'elephant in the room' of human population size,” Brook ...
 
The Weather Network
Tue, 28 Oct 2014 15:41:15 -0700

Because of this demographic momentum, there are no easy ways to change the broad trends of human population size this century." The research, led by Professor Corey Bradshaw of the University of Adelaide and Professor Barry Brook of the University of ...

Daily Mail

Daily Mail
Mon, 27 Oct 2014 13:02:37 -0700

A devastating global pandemic today that killed two billion people was only projected to reduce population size to 8.4 billion, while six billion deaths brought it down to 5.1 billion. The findings are published in the journal Proceedings of the ...

The Guardian

The Guardian
Tue, 28 Oct 2014 03:30:00 -0700

A devastating global pandemic that killed 2 billion people was only projected to reduce population size to 8.4 billion, while 6 billion deaths brought it down to 5.1 billion. “Global population has risen so fast over the past century that roughly 14 ...
 
Al Jazeera America
Wed, 29 Oct 2014 23:00:00 -0700

She told me that “compared to their population size, there are fewer minority candidates running” and explained that an important question is whether a candidate of color has won an election among a group voters before, since “once a candidate of color ...
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