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  Topic: Evolution of the horse; a problem for Darwinism?, For Daniel Smith to present his argument< Next Oldest | Next Newest >  
Erasmus, FCD



Posts: 6349
Joined: June 2007

(Permalink) Posted: Sep. 23 2007,18:29   

So I haven't been keeping up so much recently and this is a new thread to me.

Daniel, it seems that you are arguing that there is some bound that constrains evolutionary transition.  I am curious as to why you assume this must be.  As I see it, you either accept that speciation occurs, or it doesn't.  If you accept that it does, then the supposed macro-micro boundary dissolves instantly (indeed, it is a figment of imagination, suriving in the literature because it is a useful fiction for narrative exposition, like any other model).  Why do you invoke boundaries, unless you are wedded to a phenotypical model of evolution?

So you ask about 'transitional forms'.  I can point to several instances of speciation observed and/or reconstructed that do not involve transitional forms.  I would start by pointing out the speciation events that involve contact between lineages of Helianthus sunflowers (see Rieseberg, Nature a few years ago) or the ecological speciation event in Rhagoletis dipterans.  There is no transition.  This does not deny Wesley's point about the gradual process, but it does invoke a question "At what temporal scale do we intend 'gradual' to refer to", I believe this has been addressed above.  The argument against transitional forms or lineages boils down to an assertion that Zeno's Paradox is a true problem.

[Edited to add] And we know that it is not, because I just went to the store.  And I returned as well.

So the saltational opinion can be resolved with the gradualist opinion by virtue of considering that the terms are not necessarily referential to an absolute scale.

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You're obviously illiterate as hell. Peach, bro.-FtK

Finding something hard to believe based on the evidence, is science.-JoeG

the odds of getting some loathsome taint are low-- Gordon E Mullings Manjack Heights Montserrat

I work on molecular systems with pathway charts and such.-Giggles

  
  1733 replies since Sep. 18 2007,15:27 < Next Oldest | Next Newest >  

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