What is Darwinism? Joel Hanes
n One Long Argument, Ernst Mayr (evolutionary biologist, and originator of the Biological Species Concept) summarizes Darwin's theories, and traces the history of their acceptance by the world scientific community.
In the Preface , he begins:
In Chapter Four, "Ideological Opposition to Darwin's Five Theories", Mayr summarizes "Darwin's Theory", or "Darwinism", thus:
... The term "Darwinism", ... has numerous meanings depending on who has used the term and at what period. A better understanding of the meaning of this term is only one reason to call attention to the composite nature of Darwin's evolutionary thought.
... One particulary cogent reason why Darwinism cannot be a single monolithic theory is that organic evolution consists of two essentially independent processes, as we have seen: transformation in time, and diversification in ecological and geographical space. The two processes require a minimum of two entirely independent and very different theories.
... I consider it necessary to dissect Darwin's conceptual framework of evolution into a number of major theories that formed the basis of his evolutionary thinking. For the sake of convenience, I have partitioned Darwin's evolutionary paradigm into five theories, but of course others might prefer a different division. The selected theories are by no means all of Darwin's evolutionary theories; others were, for instance, sexual selection, pangenesis, effect of use and disuse, and character divergence. However when later authors referred to Darwin's theory thay invariably had a combination of some of the following five theories in mind:
Let's look at some of the implications of Mayr's analysis.
At first blush, (4) Gradualism seems like it might conflict with Gould & Eldredge's "punctuated equilibrium" theory; but on closer examination, not so.
Here [thanks to Robert Low] are two relevant quotes from On the Origin of Species:
"Varieties are often at first local...rendering the discovery of intermediate links less likely. Local varieties will not spread into other and distant regions until they are considerably modified and improved; and when they do spread, if discovered in a geological formation, they will appear as if suddenly created there, and will simply be classed as new species."
Darwin did not claim that evolutionary change is slow and continuous -- only that it does not proceed by "jumps" in a single generation (what Mayr calls "saltational" change). That is, despite the distortions of some anti-evolutionists, Darwin explictly did not think that evolution proceeds by the production of "hopeful monsters" -- Darwin himself never proposed that a fully-dinosaur parent gave birth to fully-bird progeny. Rather, the change took place in a series of intermediate, perhaps nearly insensible, steps in successive generations. Note that change over a thousand generations of any species appears as "sudden" or "abrupt" change in the fossil record, because a thousand generations is such an infinitesimally small fraction of Earth's history.
(5) Natural selection, doesn't account for some of the kinds of variation that we see in species -- particularly non-adaptive traits -- but you'll notice that Darwin didn't claim that natural selection explained all traits, merely the adaptive ones.
After Darwin, some biologists distorted the theory of natural selection into the doctrine of "strict adaptionism", in which every feature of every organism was held to be produced by natural selection (and thus some explanation of why the feature is adaptive was required.) But Darwin didn't say that all selection is natural (adaptive) selection -- only that natural selection is the source of some change, and can explain why adaptive change occurs. Modern biologists have proposed other mechanisms for change -- neutral selection, genetic drift, the "founder effect", etc. -- and Darwin himself thought that sexual selection could be important. None of these contradict the idea of natural selection; as additional mechanisms for genetic change over time, they augment it.
Here [thanks to Ken Smith] is a quote from the final chapter of the sixth edition of On the Origin of Species:
This has been of no avail.
Great is the power of steady misrepresentation; but the history of science shows that fortunately this power does not long endure.
Mayr recaps the history of Darwinist theories, and addresses the claims that Darwinism has been disproved or superseded in Chapter Ten: "New Frontiers in Evolutionary Biology".
...
Opponents of the [modern evolutionary] synthesis consistently confound three schools of Darwinism:
Darwinism is not a simple theory that is either true or false but is rather a highly complex research program that is being continuously modified and improved. This was true before the [modern evolutionary] synthesis, and it continues to be true after the synthesis. Table 2 lists many of the significant stages in the modification of Darwinism that one might recognize. Yet recognizing such seemingly discontinuous periods is in many respects an artificial enterprise. ... each of these periods was heterogeneous to some extent, owing to the diversity in the thinking of different evolutionists. Most critics who have attempted to refute the evolutionary synthesis have failed to recognize this diversity of views and thus have succeeded in refuting only the reductionist fringe of the Darwinism camp.
...
On the Origin of Species by Means of Natural Selection, or the Preservation of Favored Races in the Struggle for Life, Charles Darwin, First Edition 1859. Sixth Edition 1872.
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