Reinforcement is a process within speciation where natural selection increases the reproductive isolation between two populations of species by reducing the production of hybrids. Evidence for speciat
The southern brown tree frog, Litoria ewingi
The small ground finch, one of Darwin's finches of the Galápagos
Echinometra viridis, one of several species in the genus that produce fertile hybrids
Drosophila fruit fly
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
Evidence for speciation by reinforcement
…shown to be occurring (or to have occurred in the past) by measuring the strength of prezygotic isolation in a sympatric population in comparison to an allopatric population of the same species. Comparative studies of this allow for determining large-scale patterns in nature across various taxa. Mating patterns…
A female cobalt blue zebra cichlid
Ernst Mayr in 1994
Darwin's finches by Gould