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.
More Quotes from Ernst Mayr:
Evolution thus is merely contingent on certain processes articulated by Darwin: variation and selection.Ernst Mayr
According to the concept of transformational evolution, first clearly articulated by Lamarck, evolution consists of the gradual transformation of organisms from one condition of existence to another.
Ernst Mayr
Evolution is no longer necessarily progressive it no longer strives toward perfection or any other goal. It is opportunistic, hence unpredictable.
Ernst Mayr
Indeed, I was unable to find any evidence whatsoever of the occurrence of a drastic evolutionary acceleration and genetic reconstruction in widespread, populous species.
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
I did not claim that speciation occurs only in founder populations.
Ernst Mayr
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