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Article #2741

Re: why (evolutionarily) are zebras striped?

#2741
From: Stan Friesen
Date: Mon, 04 Jan 1993 20:18
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In article <1i5gf2INN7ea@shelley.u.washington.edu>, jespah@carson.u.washington.edu (Kathleen Hunt) writes:
|> 
|> 6. Individual Recognition
|> Zebras have individually distinct stripes, so these social animals may
|> be able to recognize individuals by stripes.  I imagine this might be one
|> function of stripes, but not the function they originally evolved for.
|> (teleologically speaking. Of course stripes only evolved because of some
|> increase in fitness enjoyed by zebras with stripes, not with any goal in 
|> mind...let's nip that "Evolution Is Not Goal Oriented" flame war in the bud...)

But this does provide a good example of why teleonomic (*not* teleologic) language
is useful in describing evolution.  Let's try to recast the above without using
teleonomic language:
	  I imagine this might be one function of stripes, but not the function
	  that provided the original fitness increase that caused the stripes
	  to evolve.

Blech - a doubly embedded subordinate clause.  This sort of locution is hardly
conducive to clear communication.

[For a description of the distinction between teleonomic and teleologic, see
"Towards a New Philosophy of Biology" by Ernst Mayr].

-- 
sarima@teradata.com			(formerly tdatirv!sarima)
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Stanley.Friesen@ElSegundoCA.ncr.com
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Path: arc1-ca.pugleaf.net!sparky!uunet!tdat!tools3!swf
From: swf@tools3teradata.com (Stan Friesen)
Newsgroups: sci.bio
Subject: Re: why (evolutionarily) are zebras striped?
Message-ID: <1687@tdat.teradata.COM>
Date: 4 Jan 93 20:18:33 GMT
References: <1992Dec31.204015.18922@husc3.harvard.edu> <crystal.725914988@glia> <1JAN199320283193@utkvx3.utk.edu> <1i5gf2INN7ea@shelley.u.washington.edu>
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