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2024-04-16T21:03:56Z

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[[File:Kakapo_Sirocco_1.jpg|Kakapo Sirocco 1|thumb]] [[File:Northern_elephant_seal_combats.jpg|Northern elephant seal combats|thumb|left]] [[File:Allele-frequency.png|Allele-frequency|thumb|left]] [[File:Apteryx_mantelli_-Rotorua,_North_Island,_New_Zealand-8a.jpg|Apteryx mantelli -Rotorua, North Island, New Zealand-8a|thumb]] [[File:Galapagos_Islands_topographic_map-en.svg|Galapagos Islands topographic map-en|thumb]] '''Small population size''' refers to a condition in which a [[species]], [[population]], or [[community]] has a relatively low number of individuals. This status can have significant implications for the [[conservation biology|conservation]], [[genetic diversity]], and [[extinction risk]] of the species or population in question. Small population size is a critical factor in the field of [[conservation genetics]], as it often leads to a decrease in genetic diversity, which can reduce the population's ability to adapt to environmental changes, increase the likelihood of inbreeding, and elevate the risk of extinction.

==Causes==
Several factors can lead to small population sizes, including:
* [[Habitat destruction]] and fragmentation, which can isolate populations and reduce their sizes.
* Overexploitation through hunting, fishing, or harvesting.
* [[Invasive species]] that compete with native species for resources.
* Environmental changes, such as climate change, which can alter the habitats that species depend on.
* Pollution, which can degrade habitats and directly harm individuals.

==Consequences==
The consequences of small population sizes are numerous and interrelated, including:
* '''[[Genetic drift]]''': Random changes in allele frequencies that can lead to a loss of genetic variation more rapidly in small populations.
* '''[[Inbreeding depression]]''': The breeding of closely related individuals can result in offspring with lower fitness, due to the expression of deleterious recessive alleles.
* '''[[Allee effect]]''': A phenomenon where individuals have a lower survival and reproduction rate when the population size is very small, which can further decrease the population size.
* '''Increased extinction risk''': Small populations are more vulnerable to stochastic events such as disease outbreaks, natural disasters, and environmental changes, which can lead to extinction.

==Conservation Strategies==
To combat the negative effects of small population sizes, conservationists employ various strategies, including:
* '''[[Habitat restoration]]''' and protection to support larger, viable populations.
* '''[[Captive breeding]]''' programs to increase population sizes before reintroduction into the wild.
* '''[[Genetic rescue]]''', where individuals from other populations are introduced to increase genetic diversity.
* '''[[Corridor (ecology)|Wildlife corridors]]''' to connect fragmented habitats, allowing for gene flow between populations.

==See Also==
* [[Population bottleneck]]
* [[Conservation biology]]
* [[Endangered species]]
* [[Wildlife conservation]]

[[Category:Conservation biology]]
[[Category:Population genetics]]
[[Category:Ecology]]

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Small population size - Revision history

Prab: CSV import