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Speciation is the basic process of evolution by which new species appear.

Although the theory of evolution is a century and a half old the precise mechanism by which new species make their appearance in the biosphere is still a field of active research, with all the disagreements and debates that go with it. A number of types of speciation have been proposed.

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Allopatric speciation is supposed to be caused by the physical separation of specimens of what was one and the same species. The classical example is Darwin's work on the finches of the Galapagos Islands. The presumed scenario is that an ancestral species of finch reached the various islands and evolved in about as many different species as there are islands. The critical factor causing the speciation is usually assumed to be the severing of the gene flow between the population on an island and the mother population on the mainland.

Mayr also stressed the small size of the new population and contended that e.g. the emergence of the did not lead to much speciation of biota of the shallow seas at either side because both represented a far too large gene pool to allow allopatric speciation to occur.

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This type of speciation is taken to occur in the same geographic area -without severance of the gene flow- due to ecological differences, e.g. the existence of two different ecological niches into which an existing species can specialize.

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