Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!utgpu!water!watnot!watmath!clyde!cbatt!osu-eddie!bgsuvax!gagen
From: gagen@bgsuvax.UUCP
Newsgroups: talk.origins,sci.bio
Subject: Re: question about animal hybridization
Message-ID: <752@bgsuvax.UUCP>
Date: Wed, 25-Mar-87 11:49:35 EST
Article-I.D.: bgsuvax.752
Posted: Wed Mar 25 11:49:35 1987
Date-Received: Sun, 29-Mar-87 11:12:44 EST
References: <3353@ihlpa.ATT.COM>
Organization: Bowling Green State University B.G., Oh.
Lines: 18
Keywords: evolution speciation
Xref: utgpu talk.origins:471 sci.bio:181
Summary: speciation

In article <3353@ihlpa.ATT.COM>, lew@ihlpa.ATT.COM (Lew Mammel, Jr.) writes:
> 
> I asserted that this criterion doesn't generate an equivalence relation,
> since there might be populations A, B, and C, such that A is compatible
> ( by the above criterion ) with B, B is compatible with C, but A is not
> compatible with C.
> 
> My question is, is there an example of this intransitivity among known
> populations of animals? ( N.B. animals, not plants! )

Yes.  There are several.  There is at least one group of frogs.
There is a group of snakes.  I will see if I can locate the articles.

Kathi Gagen
Dept. of Biological Sciences
Bowling Green State Univ.
Bowling Green Ohio  43402
gagen@bgsuvax