[Taxacom] barcode of life

[Stephen Thorpe]

>It's because, in general, every population is different from all others that some criterion other than difference (whether morphological or genetic), has to be used to define species

er, ... just about every *individual* is different from all others! Isn't that why the criterion of reproductive isolation is used???

Stephen




________________________________
From: Frederick W. Schueler <bckcdb at istar.ca>
Cc: TAXACOM at MAILMAN.NHM.KU.EDU
Sent: Thu, 1 July, 2010 2:12:16 PM
Subject: Re: [Taxacom] barcode of life

Doug Yanega wrote:

> What I have yet to see, and would very much like TO see, is for a 
> barcode proponent to explain the genetic criteria for delimiting 
> subspecies. Or am I correct that they simply do not believe in 
> subspecies, thereby - by default - leading to the conclusion that all 
> genetically diagnosable taxa have to be recognized as species?

* wasn't it a principle of multivariate phenetic morphometrics, back in 
the 1970s, that, given enough characters, all *populations* would be 
diagnosable, and that was the big reason for supporting Wilson & Brown, 
1954, in rejecting the classical (zoological) "diagnosis" subspecies as 
a category?

It's because, in general, every population is different from all others 
that some criterion other than difference (whether morphological or 
genetic), has to be used to define species.

fred.
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          Frederick W. Schueler & Aleta Karstad
Bishops Mills Natural History Centre - http://pinicola.ca/bmnhc.htm
Thirty Years Later Expedition - 
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Longterm ecological monitoring - http://fragileinheritance.org/
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    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/
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