Teaching a course on speciation right now, where we discuss Mayr's view of Darwin, on which I have written. So I published my view of this in 2008: https://doi.org/10.1111/j.1095-8312.2008.01089.x
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I am not totally convinced dog breeds are different species. But not b/c I think they are qualitatively different from species. I would't call maize & teosinte different species either, but agree with your general point (and am not sure all the "species" of oaks are real either, so what do I know?).
Well, I don’t think you have to decide on species delimitation exactly the same as my “revelation” on being asked that question by a student. But when you say “I’m not totally convinced…” I think you fall closer to Darwin’s argument for gaps between species, but not between “varieties” than Mayr 1/
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