[Taxacom] barcode of life

Paul Kirk p.kirk at cabi.org
Thu Jul 1 11:00:51 CDT 2010

characteristics of organisms/individuals change through evolution so ... it's 'evolution of the constituent organism of the higher taxon ...' and 'a set of organisms grouped into two or more species which constitute a genus' ... 'organisms/individuals die off ...' and 'the characteristics of the organisms/individuals which define the species which constitute the genus change and thus the genus changes'
I guess that's enough dancing angels for one day :-)


From: taxacom-bounces at mailman.nhm.ku.edu on behalf of Richard Zander
Sent: Thu 01/07/2010 16:26
To: Robin Leech; Stephen Thorpe; dipteryx at freeler.nl; taxacom at mailman.nhm.ku.edu; Steve Manning
Subject: Re: [Taxacom] barcode of life

I don't think genera and higher categories are necessarily generated by
"human imagination." There is lots of discussion of evolution of higher
taxa in the literature.

Consider a set of species all sharing some fairly neutral generic traits
(ones that for that bauplan don't affect selection in the different
environments of the different species). Well suppose all environments
dry out. All species of the genus that can't take it, die off, the
remainder survive, and future speciation is necessarily constrained to
dry habitats. The genus thus evolves. The shared genetic basis is
mediated by the environment as a kind of "envirosome."

Richard H. Zander
Voice: 314-577-0276
Missouri Botanical Garden
PO Box 299
St. Louis, MO 63166-0299 USA
richard.zander at mobot.org
Web sites: http://www.mobot.org/plantscience/resbot/
and http://www.mobot.org/plantscience/bfna/bfnamenu.htm
Modern Evolutionary Systematics Web site:

-----Original Message-----
From: taxacom-bounces at mailman.nhm.ku.edu
[mailto:taxacom-bounces at mailman.nhm.ku.edu] On Behalf Of Robin Leech
Sent: Thursday, July 01, 2010 9:53 AM
To: Stephen Thorpe; dipteryx at freeler.nl; taxacom at mailman.nhm.ku.edu;
Steve Manning
Subject: Re: [Taxacom] barcode of life

Hi Steve,
The possible reason is that species are real, and that all categories
genera on up the hierarchy represent human imagination.


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