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Date: Wed, 18 Oct 2000 08:05:23 -0400 (EDT)
From: Gerry Moore <gerrymoore40@hotmail.com>
To: velosa@cinenet.net, PhyloCode@ouvaxa.cats.ohiou.edu
Subject: Re: Moore's hybrid example (was Nathan Wilson's question)
Nathan drew: > > 4 > /\ 3 > / \ /> / \ / > / \ / > / X > / / \ > / / \ > / / \ > / / \ > / / \ > / / \ > 7 / 12 9 / 10 5 13 6 \ 1 \ 2 8 11 > \/ / \ / \ / \ / \ / \ / \ / > \ / / \/ \/ \/ A\ \/ > \/ / / / \ \ / > \ / / / \ \ / > \ / / / \ / > Y\ / / \ / > \ / / \ / > \ / / \/(Z) > B\/ / / > \ / / > \ / / > \/ / > \ / > \ / > \ / > \ / > \ / > \ / > \ / > \ / > \/Z > Nathan's example above represents one of the examples I have been working on. Let's say Alpha is defined as the least inclusive clade containing species 3 and species 4. If I am reading Nathan's cladogram correctly species 3 and 4 are each members of the clade Y and clade (Z) and the name Alpha could apply to either of these two clades based on its current definition. The phrase "least inclusive" should not be used in choosing between nonnested clades even if one has fewer species than the other (since this may simply be a sampling artifact). Thus, I believe, the application of the name is ambiguous. Following the other interpretation I presented the application of Alpha is not ambiguous as the name would be applied to clade Z. In other words, I agree with Nathan's analysis here. However, based on the several examples I have been working, I am inclined to still go with Kevin's interpretation, with the understanding that conservations may be necessary in cases where it results in an undesirable circumscriptional change or where the application is ambiguous (as above). The issue gets more complicated (and I believe the other interpretation I presented fairs more poorly) when we expand the examples to include cases in which species of hybrid origin are used in not only node-based defintions but also stem-based defintions. Cheers, Gerry Moore Brooklyn Botanic Garden 18 Oct. 2000 _________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. Share information about yourself, create your own public profile at http://profiles.msn.com.