Since it has repeatedly been claimed here by several people that there are no significant disputes about mechanism among evolutionary theorists (i.e., that all disputes are only over minor details or issues “on the periphery”), I offer here a clear example of a serious dispute regarding mechanism between evolutionary biologists.
This is a review by Jerry Coyne of an article by Davidson and Erwin. The review is published in Science, a prestigious journal.
The link is:
The point here is not which side in the dispute is correct; the point is that there is a dispute, that the dispute is over mechanisms of evolution, and that it is not a dispute over a trivial “detail” question or a “peripheral” question but over a major difference regarding the causes of evolutionary change at the higher taxonomic levels.
Which is what I said an earlier discussion to Chris Falter – that such disputes exist. He seemed to contest this.
I could provide many more debates of this sort, but I don’t intend to waste my time digging them all up. (The sort of person here who will not accept this example as proof of the existence of serious disagreement over evolutionary mechanisms would not accept any other example I could dig up.)
For people who are interested in the broader questions behind this dispute, there is an informative article by Erwin: