Re: Comments/Questions re Phylum level evolution

From: David F Siemens (
Date: Sat Aug 26 2000 - 19:46:06 EDT

  • Next message: John Burgeson: "smorgasbord of explanations"

    Looking over your message suggests to me that you are looking for a
    one-size-fits-all explanation. I noted an explanation that I did not
    expect in Science, 21 July, pp. 441ff and 369f. The preferred food plants
    have produced different beaks in males and females of a species of
    hummingbirds. I doubt that run of the mill explanations can be bent to
    fit this one.

    T'other Dave

    On Sat, 26 Aug 2000 06:46:04 EDT writes:
    > In a message dated 8/24/2000 10:37:13 AM,
    > writes:
    > << Numerous evolutionary mechanisms have been proposed for
    > generating rapid
    > diversification, including key innovations (eyesight, predation,
    > planktivory,
    > hard skeletons, etc.) and environmental factors (global warming,
    > increased
    > oxygen levels, etc.). Conversely, various factors have been
    > suggested as
    > constraining later evolution, including the filling of niches and
    > increased
    > genomic integration and stability.
    > >>
    > Dave:
    > The objection to all such mechanism is that they comprise what
    > Walter Remine
    > calls a smorgasbord of explanations, from which one selects the one
    > that
    > seems most plausible. Are you really satisfied that after you list
    > all these
    > possible mechanisms, plus the etc., that you really know anything
    > more than
    > you knew before? These are really only hypotheses at best that
    > still need to
    > be tested. Just listing them is no more than the first step, like
    > brainstorming. How does one test them?
    > Thanks,
    > Bob
    > Bob

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