Population size
hideIn 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.
For more information about Population size, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
News tagged with population size
Abundance of a look-alike species clouds population status of a million dollar fish
Dec 10, 2009 |
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The prized white marlin, sought by anglers in million dollar prize tournaments and captured incidentally in commercial fisheries, is among the most overfished marine species under international management and the subject ...
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Does Glutathione-S-transferase associate with gastrointestinal cancer in Korean population?
1hour ago |
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The glutathione S-transferase M1 (GSTM1) and glutathione S-transferase T1 (GSTT1) null genotypes have been linked to increased risk of developing cancer. The results regarding the association between GSTM1 and GSTT1 null ...
Hubble Finds Smallest Kuiper Belt Object Ever Seen
Space & Earth / Space Exploration
19 hours ago |
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(PhysOrg.com) -- NASA's Hubble Space Telescope has discovered the smallest object ever seen in visible light in the Kuiper Belt, a vast ring of icy debris that is encircling the outer rim of the solar system ...
World's rarest gorilla ready for its close-up (w/ Video)
22 hours ago |
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The world's rarest -- and most camera shy -- great ape has finally been captured on professional video on a forested mountain in Cameroon, according to the Wildlife Conservation Society and Germany's NDR Naturfilm.
Even at sublethal levels, pesticides may slow the recovery of wild salmon populations
Dec 16, 2009 |
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Biologists determined that short-term, seasonal exposure to pesticides in rivers and basins may limit the growth and size of wild salmon populations. In addition to the widespread deterioration of salmon habitats, these findings ...
Teen marijuana use tilts up, while some drugs decline in use
Dec 14, 2009 |
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(PhysOrg.com) -- Marijuana use among American adolescents has increased gradually over the past two years (three years among 12th-graders) following years of declining use, according to the latest Monitoring the Future study, ...
Smoking continues gradual decline among U.S. teens, smokeless tobacco threatens a comeback
Dec 14, 2009 |
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(PhysOrg.com) -- Teen smoking reached its recent peak levels around 1996 and 1997, followed by a sharp decline for about six years and a continued more gradual decline ever since, according to the latest Monitoring the Future ...
Study unveils potential genetic links to lung disease risk
Dec 14, 2009 |
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A new study involving data from more than 20,000 individuals has uncovered several DNA sequences linked to impaired pulmonary function. The research, an analysis that combined the results of several smaller studies, provides ...
26 operations, 13 kidneys: hope to few with little
Dec 14, 2009 |
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(AP) -- Twenty-six operations put healthy kidneys into 13 desperately ill people: Doctors in the nation's capital just performed a record-setting kidney swap, part of a pioneering effort to expand transplants ...
Pathological gambling may be successfully treated with medications for substance addiction
Medicine & Health / Psychology & Psychiatry
Dec 10, 2009 |
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Pathological gambling can be successfully treated with medications that decrease urges and increase inhibitions, according to researchers at the annual meeting of the American College of Neuropsychopharmacology (ACNP). Researchers ...
Ubiquitous health: Enabling telemedicine to cut hospital visits, save money
Dec 09, 2009 |
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A ubiquitous health monitoring system that automatically alerted the patient's family or physician to problematic changes in the person's vital signs could cut hospital visits and save lives, according to Japanese researchers ...
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