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	File:Ernst_Mayr_PLoS.jpg\|Allopatric speciation		File:Ernst_Mayr_PLoS.jpg\|Allopatric speciation
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			== Allopatric Speciation ==

			'''Allopatric speciation''' is a mode of [[speciation]] that occurs when biological populations of the same species become isolated from each other to an extent that prevents or interferes with [[gene flow]]. The term "allopatric" is derived from the Greek words "allos," meaning "other," and "patris," meaning "fatherland." This form of speciation is considered one of the most common mechanisms by which new species arise.

			== Mechanism ==

			Allopatric speciation typically involves the following stages:

			=== Geographic Isolation ===

			The initial step in allopatric speciation is the physical separation of populations. This can occur due to various geographic barriers such as [[mountain]] ranges, [[river]]s, [[ocean]]s, or [[desert]]s. These barriers prevent individuals from different populations from interbreeding.

			=== Genetic Divergence ===

			Once isolated, the separated populations undergo [[genetic drift]], [[mutation]], and [[natural selection]] independently. Over time, these processes lead to genetic divergence. The differences in [[allele]] frequencies between the populations increase, leading to distinct genetic identities.

			=== Reproductive Isolation ===

			As genetic divergence continues, reproductive isolation mechanisms develop. These mechanisms can be prezygotic, such as differences in mating rituals or timing, or postzygotic, such as reduced viability or fertility of hybrid offspring. Once reproductive isolation is established, the populations are considered separate species.

			== Examples ==

			One classic example of allopatric speciation is the [[Darwin's finches]] on the [[Galápagos Islands]]. These birds are thought to have originated from a common ancestor but have diversified into multiple species due to geographic isolation on different islands.

			Another example is the [[squirrel]] populations on either side of the [[Grand Canyon]]. The [[Kaibab squirrel]] and the [[Abert's squirrel]] are separated by the canyon and have evolved into distinct species.

			== Importance in Evolution ==

			Allopatric speciation is a fundamental concept in [[evolutionary biology]] as it explains how new species can arise from a common ancestor. It highlights the role of geographic and environmental factors in shaping the [[biodiversity]] of our planet.

			== Related Pages ==

			* [[Sympatric speciation]]
			* [[Peripatric speciation]]
			* [[Parapatric speciation]]
			* [[Reproductive isolation]]
			* [[Evolution]]

			{{Speciation}}

			[[Category:Evolutionary biology]]
			[[Category:Speciation]]

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File:Allopatric_Speciation_Schematic.svg|Allopatric speciation
File:Allopatric_Speciation_with_Reinforcement_Schematic.svg|Allopatric speciation
File:Peripatric_Speciation_Schematic.svg|Allopatric speciation
File:Female_Cobalt_Blue_Zebra_Cichlid.JPG|Allopatric speciation
File:Areas_of_Endemism_(South_America).png|Allopatric speciation
File:Area_Cladogram_of_Charis_butterflies_(Horizontal).png|Allopatric speciation
File:Allopatric_speciation_caused_by_topography.svg|Allopatric speciation
File:Isthmus_of_Panama_(closure)_-_Speciation_of_marine_organisms_(w_annot).png|Allopatric speciation
File:Pan_(genus)_distribution_map.png|Allopatric speciation
File:Drosophila_speciation_experiment.svg|Allopatric speciation
File:Ernst_Mayr_PLoS.jpg|Allopatric speciation
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Allopatric speciation - Revision history

Prab: CSV import

Prab: CSV import