Received: by alpheratz.cpm.aca.mmu.ac.uk id TAA12586 (8.6.9/5.3[ref email@example.com] for cpm.aca.mmu.ac.uk from firstname.lastname@example.org); Sat, 8 Sep 2001 19:51:32 +0100 Message-ID: <000901c1389c$c4c54200$b7a2bed4@default> From: "Kenneth Van Oost" <Kenneth.Van.Oost@village.uunet.be> To: <email@example.com> References: <2D1C159B783DD211808A006008062D310174604E@inchna.stir.ac.uk> <002d01c13052$fbdb7680$8fdab3d1@teddace> Subject: Re: Dawkins & Convergent Evolution- the final word (?) Date: Sat, 8 Sep 2001 21:29:57 +0200 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.00.2314.1300 X-MIMEOLE: Produced By Microsoft MimeOLE V5.00.2314.1300 Sender: firstname.lastname@example.org Precedence: bulk Reply-To: email@example.com
----- Original Message -----
From: Dace <firstname.lastname@example.org>
> F. W. Went studied convergence among shrubs in New Zealand. He found
> 50 species of shrubs that had independently developed the same pattern of
> "interlaced, tortuous branches and reduced leaves." This would presumably
> have protected them from herbivores. But there are no herbivores native
> New Zealand. Moreover, this pattern "occurs in so many shrubs from
> different habitats, it does not seem to be an adaptation to the
> environment." He provides several other examples of convergence which he
> contends cannot be explained by natural selection. He argues that the
> chromosomes associated with these traits must have somehow hopped across
> species. (Went, "Parallel Evolution," Taxon 20:197-226, 1971.)
The same affect is playing among lemmings which do eat the vegetation
in large amounts, and in such amounts that they starve.
They starve because 1_ the vegetation changes into species which the
lemmings don 't like and 2_ the vegetation, like Went said, developed
patterns by which they were protected from hervivores.
In the first case, the changes are ' fast ', in the second case, the change
is ' slow '.
I find the second case more strange than the first and that due to the
fact that slowly changing in order to keep the lemmings away would
have, in natural selection- time, no effect.
In the worst case, lemmings could co- adapted the change in the vege-
tation, so why change !?
Could this be explained as an example of convergence by which both
the plant and the animal " evolves " in a seperate and specific niche !?
Just a thought.
( I am, because we are)
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