Reinforcement (speciation)
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Reinforcement is a process of speciation where natural selection increases the reproductive isolation between two populations of species. This occurs as a result of selection acting against the produc
Alfred Russel Wallace proposed in 1889 that isolation could be strengthened by a form of selection.
Darwin's finches by Gould
Allopatric speciation
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Allopatric speciation is a mode of speciation that occurs when biological populations become geographically isolated from each other to an extent that prevents or interferes with gene flow. Its name c
A female cobalt blue zebra cichlid
Ernst Mayr in 1994