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From: friesen@psivax.UUCP (Stanley Friesen)
Newsgroups: net.origins
Subject: Re: The Keebler Chronicles (6 of 7)
Message-ID: <417@psivax.UUCP>
Date: Thu, 25-Apr-85 18:59:42 EST
Article-I.D.: psivax.417
Posted: Thu Apr 25 18:59:42 1985
Date-Received: Sat, 27-Apr-85 06:33:45 EST
References: <940@uwmacc.UUCP>
Reply-To: friesen@psivax.UUCP (Stanley friesen)
Distribution: net
Organization: Pacesetter Systems Inc., Sylmar, CA
Lines: 34
Summary: 

In article <940@uwmacc.UUCP> dubois@uwmacc.UUCP (Paul DuBois) writes:
>
>>>> [Ernest Hua / Keebler]
>>> { from: Paul DuBois {allegra,ihnp4,seismo}!uwvax!uwmacc!dubois }
>>>> { from: Jeff Sonntag }
>>>> Paul Dubois, writing on the (mistaken) idea that when a new specie 
>>>> evolves, all members of the parent specie must die out:
>
>> Indeed, quite a GROSS ERROR.
>
>Yep.  It comes from the Principle of Competitive Exclusion.  Your side
>thought it up.  Sorry.
>
	This is a complete misunderstanding of the principle of
Competetive Exclusion. All it says is that ecologically similar
species will exclude one-another from any given locality. That is
only one of a pair of ecologically similar spp will be found at any
one site. This says *nothing* abount adjacent localities, thus nearby
places may have a different one of the pair. Thus, a daughter sp and
a parent species could easily co-exist *temporally* at different
places. There is also an alternative response, called Competetive
Displacement, whereby features relating to environmental utilization
shift in the area of co-occurance to minimize competition, allowing
closely related spp to co-occur by means of differing ecological
specialization - bypassing Exclusion. This phenomenon is *observed*,
there are a number of examples of species pairs whith a narrow range
of geographical overlap which show divergent character displacement
in the area of overlap, and *only* in the area of overlap.
-- 

				Sarima (Stanley Friesen)

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