[Taxacom] Morphology vs Molecular

[Don.Colless at csiro.au]

I find it hard to imagine a "score" .. "based on an overall picture." Phenetic analysis demands (as far I understand it) a similarity matrix to work from. This may, of course, be calculated in various ways.  So does "neighbour joining" phylogenetic analysis.

Donald H. Colless
CSIRO Div of Entomology
GPO Box 1700
Canberra 2601
don.colless at csiro.au
tuz li munz est miens envirun

________________________________________
From: taxacom-bounces at mailman.nhm.ku.edu [taxacom-bounces at mailman.nhm.ku.edu] On Behalf Of bti at dsmz.de [bti at dsmz.de]
Sent: 20 August 2009 15:17
To: taxacom at mailman.nhm.ku.edu
Subject: Re: [Taxacom] Morphology vs Molecular

Thank you for clarifying your usage. I stand corrected if I
interpreted your usage wrong. One point that has had be curious is
what are the consequences of "overall similarity" - does this mean
that one must aalways generate a mathematical similarity value or can
one score this based on an the "overall picture". The "classical"
pheneticists tended to generate similarity values, but I am not sure
if this always has to be the case. Just a thought.

Brian

Quoting John Grehan <jgrehan at sciencebuff.org>:

>> bounces at mailman.nhm.ku.edu] On Behalf Of bti at dsmz.de
>> It is not just John Grehan who uses terms in a more than "derived"
>> fashion phenetic = phenotype and cladistic = molecular.
>
> Correction - I use phenetic to refer to overall similarity, whether in
> morphology or molecules and cladistics to refer to analysis of the
> distribution of derived character states shared between various taxa of
> an ingroup.
>
> Given the fact
>> that the original definition of phenetic initially centred on the
>> phenotpye but indicated that it could include genetic characters "as
>> they become available"
>
> And with that I could concur.
>
> If you consult many of the
>> taxonomic papers in prokaryote research one finds three data sets -
>> genetic, phenotypic and phylogenetic.
>
> Which would be confusing indeed.
>
> John Grehan
>
>
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