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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]


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Population Size

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On Line opinion
Tue, 25 Mar 2014 16:37:30 -0700

If there's one thing that's really big in the population size debate, it's the size of the scare campaigns made by both sides. One side tells us that a big Australia is a 'catastrophe', while the other says that slow population growth will hurt share ...
 
Pokerfuse
Wed, 19 Mar 2014 08:10:21 -0700

Peak Traffic: Nevada Online Poker Market Matches its Population Size. The number of cash game seats in Nevada as a proportion of its population fits the same ratio observed in markets worldwide. Share: Total Nevada cash game traffic is now lower than ...

Eurasia Review

The Economist
Wed, 16 Apr 2014 08:00:24 -0700

Rather than try to control population size, the central government would do better to have a go at curbing the spatial expansion of cities. Local bureaucrats have a predilection for vast areas of concrete. Plazas, broad boulevards and colossal airports ...
 
The Missoulian
Thu, 10 Apr 2014 07:10:51 -0700

“Data on each of these aspects of wolf population size will give us a very solid assessment of the effects of harvest on wolf populations in Montana,” Gude said. By adding additional harvest information, Gude said specific predictions of the effects of ...
 
Science Codex
Wed, 16 Apr 2014 04:48:45 -0700

The researchers used a novel framework, based on a method previously employed to analyze ancient DNA samples, to predict what population size would be necessary to maintain current genetic diversity of tigers into the future. The authors believe this ...
 
The Missoulian
Tue, 08 Apr 2014 12:01:37 -0700

"Data on each of these aspects of wolf population size will give us a very solid assessment of the effects of harvest on wolf populations in Montana," Gude said. By adding additional harvest information, Gude said specific predictions of the effects of ...
 
The Patriot-News
Wed, 16 Apr 2014 16:12:50 -0700

The study said monitors detected 11 non-native, invasive species; the one with the largest mean population size was Japanese stilt-grass, which it said, "is found throughout the state forest system and is often one of the first invasive species to ...

Citizen

Citizen
Wed, 16 Apr 2014 04:52:46 -0700

Her research found that if even 15 dolphins were removed from a small population of 10,000, it could have a dire effect on the overall population size. By determining the genetic relationship between the different populations, Gopal helped to identify ...
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