XXI.5 Various types of speciations can be sorted according to the type of reproductive barrier

If the separation and differentiation of a new species was caused primarily by spatial and temporal separation of two subpopulations, then this speciation is called allopatric. In principle, allopatric speciation could be divided into several types according to the process that caused the phenotype differentiation of the two parts of the population (drift, selection, drive, draft, etc.); however, this is mostly not done. Of course, the situation is different when the separation of the parent species is caused by internal reproduction barriers. A number of different types of speciation can be distinguished according to the character of these barriers.

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The classical Darwinian theory of evolution can explain the evolution of adaptive traits only in asexual organisms. The frozen plasticity theory is much more general: It can also explain the origin and evolution of adaptive traits in both asexual and sexual organisms Read more
Draft translation from: Evoluční biologie, 2. vydání (Evolutionary biology, 2nd edition), J. Flegr, Academia Prague 2009. The translation was not done by biologist, therefore any suggestion concerning proper scientific terminology and language usage are highly welcomed. You can send your comments to flegratcesnet [dot] cz. Thank you.