American evolutionist, Theodosius Dobzhansky ..
It is Vrba’s special insight that ecosystem decay and fragmentation may lead, not only to habitat tracking in and out of a region, and to true extinction, but to true speciation as well. Recall that fragmentation of a species’ original geographic range, as first developed fully by Dobzhansky and Mayr, is a prerequisite to allopatric speciation. Also, note the date of this African disturbance: 2.5 million years ago — just when the Isthmus of Panama rose — and, according to some geologists, created the Gulf Stream, thought by some to have triggered the global cooling pulse that had such a profound effect on the African biota. Elsewhere, I have also suggested that the patterns of speciation in South America that occasioned Hafner’s “refugium” hypothesis in all likelihood reflect the very same sets of ecological and evolutionary processes - through the very same causes12 — as documented and discussed by Vrba.11
Dobzhansky Evolution Essay American
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He was awarded the National Medal of Science in 1964, and the Franklin Medal in 1973."Nothing in biology makes sense except in the light of evolution." 1973 essay by the evolutionary biologist and Russian Orthodox Christian Theodosius Dobzhansky, criticising anti-evolution creationism and espousing theistic evolution.
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Dobzhansky first published the title statement, in a slightvariation, in a 1964 article in American Zoologist,"Biology, Molecular and Organismic", to assert the importance oforganismic biology in response to the challenge of the rising fieldof . Theterm "light of evolution"—or sub specie evolutionis—hadbeen used earlier by biologist .