quote:He also suggested the term "meso evolution" but where is the description of *this* in=between evolution in the literature?
I know of several papers by Spiess, Wallace and Dobzhansky himself where itâ€™s mentioned or described. But that doesn't change the basic fact that these terms (including 'megaevolution', for that matter, which Dobzhansky also coined) do not imply different processes at work.
quote: took this part of Wilson's definitionâ€”"A large amount of change would be referred to as macroevolution or simply as evolution"â€”to imply speciation. I beieve that's fair.
So, you think that Wilson considers macroevolution to occur at the level of the species and above, while Mayr considers it to be at the genus and above. Does it matter where the line is drawn, conceptually? How does the process that results in speciation differ from the kind of divergence that results in different genera?
quote:Is there only one process? I can think of five know processes that can provoke an evolutionary event, or a divergence
It is divergence--of one population from another-- that underlies the existence of all taxonomic groups, from species to kingdoms. So it doesn't matter how many ways that divergence can occur. Divergence is the process common to both micro and macroevolution. Therefore, the terms are, as Dobzhansky said, merely descriptive in nature.