wk writes:
So what exactly is it you object to, how do you understand the statement and what about it makes you think it demolishes the authors credibility?
Well, maybe it doesn't, given my capitulation to PaulK in the previous post. I was reacting to this statement:
quote:
Species aren't formed by selection for differing adaptive traits within a population, but by the interruption of the gene flow that is caused by migration or invasion between populations.
I think species can be formed by multiple mechanisms, not all of which are selective, as I have argued with you before in other threads. I've even posted this schematic to illustrate the different ways speciation (or macroevolution) can occur:
To argue that "species aren't formed by selection for differing adaptive traits within a population" is to ignore the role of natural selection. To argue that speciation occurs via "the interruption of the gene flow that is caused by migration or invasion between populations" is OK, but narrow. Other "forces" in addition to gene flow play their parts in speciation, too. Don't you agree?
”HM