[Taxacom] barcode of life

Richard Zander Richard.Zander at mobot.org
Thu Jul 1 10:26:51 CDT 2010


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:
http://www.mobot.org/plantscience/resbot/21EvSy.htm
*****************************

-----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
from
genera on up the hierarchy represent human imagination.
Robin




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