“I did not claim that speciation occurs only in founder populations.”
Other Ernst Mayr Quotes
The major novelty of my theory was its claim that the most rapid evolutionary change does not occur in widespread, populous species, as claimed by Most geneticists, but in small founder populations.
Ernst Mayr 
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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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All I claimed was that when a drastic change occurs, it occurs in a relatively small and isolated population.
Ernst Mayr
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