Aspects of this topic are discussed in the following places at Britannica.
In some modes of speciation the first stage is achieved in a short period of time. These modes are known by a variety of names, such as quantum, rapid, and saltational speciation, all suggesting the shortening of time involved. They are also known as sympatric speciation, alluding to the fact that quantum speciation often leads to speciation...
Quantum speciation is a rapid process of reproductive isolation often brought about by chromosomal mutation in one population of a species. When the mutant population interbreeds with the parent population, unfit hybrid offspring are produced; then, as in geographic speciation, natural selection completes the isolation of the two groups.
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