[Taxacom] Dispersal... again

[Frederick W. Schueler]

On 10/25/2011 3:47 PM, Michael Heads wrote:
>
> You wrote: '...vicariance (allopatry in Mayr?s parlance...'.  For Mayr, allopatry was not caused by vicariance, but by chance dispersal.

* sometimes it was, and sometimes it wasn't - reread "Animal Species and 
Evolution."

This endless vicariance versus dispersal discussion reminds me of the 
"are populations regulated density dependently or 
density-independently?" controversy of the 1960s which, faded away when 
it turned out that sometimes they were, and sometimes they weren't.

fred schueler.
------------------------------------------------------------
          Frederick W. Schueler & Aleta Karstad
Bishops Mills Natural History Centre - http://pinicola.ca/bmnhc.htm
Mudpuppy Night in Oxford Mills - http://pinicola.ca/mudpup1.htm
Daily Paintings - http://karstaddailypaintings.blogspot.com/
     RR#2 Bishops Mills, Ontario, Canada K0G 1T0
   on the Smiths Falls Limestone Plain 44* 52'N 75* 42'W
    (613)258-3107 <bckcdb at istar.ca> http://pinicola.ca/
------------------------------------------------------------
------------------------------------------------------------