Real species and ideology

[Curtis Clark]

At 23:46 2004-04-20, Richard Pyle wrote:
>If I understand your point correctly, you're saying that the difference
>between a morphocline and introgressive hybridization is that for it to be
>thought of as a morphocline, the two differing populations must be
>monophyletic with respect to all known extant populations; whereas if the
>two populations are not monophyletic (or in some cases paraphyletic), then
>it would be considered a case of introgressive hybridization, and not a
>morphocline. Do I interpret you correctly?

That's not what *I'm* saying, certainly. I am talking about it in a process
sense: introgression involves an increase in gene flow between groups of
populations that were effectively isolated and differentiated. And I would
argue that in sexually-reproducing eukaryotes, populations are often not
monophyletic.


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Curtis Clark                  http://www.csupomona.edu/~jcclark/
Web Coordinator, Cal Poly Pomona                 +1 909 979 6371
Professor, Biological Sciences                   +1 909 869 4062