All I claimed was that when a drastic change occurs, it occurs in a relatively small and isolated population.
More Quotes from Ernst Mayr:
I did not claim that speciation occurs only in founder populations.Ernst Mayr
No longer is a fixed object transformed, as in transformational evolution, but an entirely new start is, so to speak, made in every generation.
Ernst Mayr
I had found again and again that the most aberrant population of a species - often having reached species rank, and occasionally classified even as a separate genus - occurred at a peripheral location, indeed usually at the most isolated peripheral location.
Ernst Mayr
As a consequence, geneticists described evolution simply as a change in gene frequencies in populations, totally ignoring the fact that evolution consists of the two simultaneous but quite separate phenomena of adaptation and diversification.
Ernst Mayr
I have been unable to discover in Darwin's writings any connection between allopatric speciation and change of evolutionary rate.
Ernst Mayr
New gene pools are generated in every generation, and evolution takes place because the successful individuals produced by these gene pools give rise to the next generation.
Ernst Mayr
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