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*To*: znc14@ttacs1.ttu.edu*Subject*: Re: why larger?*From*: Dinogeorge@aol.com*Date*: Fri, 21 Feb 1997 13:00:29 -0500 (EST)*Cc*: dinosaur@usc.edu, MWEDEL@gslan.offsys.uoknor.edu, Dinogeorge@aol.com*Reply-to*: Dinogeorge@aol.com*Sender*: owner-dinosaur@usc.edu

In a message dated 97-02-21 12:14:25 EST, znc14@ttacs1.ttu.edu (Jonathan R. Wagner) writes: << The speciation event itself is irrelevant to my point, and I apologize for any confusion. If the circumstances which we theorize are responsible for dwarfism are, at least, a subset of those we theorize are responsible for speciation, then dwarfism might be considered a form of speciation as long as it does not violate the biological constraints of that term (ie. interbreeding is effectively impossible, etc...). >> Of course dwarfism is a form of speciation; no argument there. What I'm more interested in is >speciation< itself. Exactly how and when do we determine that a speciation event has occurred? Suppose at time t=0 we have a population of large mammoths in Siberia, and at time t=10,000 we have a population of small mammoths on Wrangell Island but no large mammoths in Siberia. Assuming we have a perfect understanding of the fossil record, at what time t between 0 and 10,000 did the small mammoths arise, and how long did it take for this event to happen?

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