RES:Compositional argument for homology

[Thomas Schlemmermeyer]

Hello, I want to give my comments as well, Claudio Matzke wrote:
>"Compositional relationship between components of an organism may be an
>argument for homologies between parts of organisms."
>
>May anybody understand this sentence?
>

Then Doug wrote:

>This sounds like a loose translation of one of Reaumeur's (sp.? I'm =
sure I've got this wrong) rules of homology

The guy=B4s name was Remane , he used three criteria to recognize a =
homology:

1.) degree of complexity  (spezifische Qualit=E4t)  The more complex a =
certain structure is,
the less probable is its repeated, independent coming into existence.

2.) position in the comparable system (Lage im vergleichbaren =
Gef=FCgesystem). Structures which are not similar can be recognized as =
homologies if they are in a similar position in relation to other =
structures which are homologies on their own.

3.) Continuity  (Stetigkeit) structures which are not similar may be =
homologies if there are structures of intermediate form.

These three criteria are said to be found in the following text =
(Unfortunateley, I never read it):
Remane, A. (1952) Die Grundlagen des nat=FCrlichen Systems, der =
vergleichenden Anatomie und der Phylogenetik. Akademische =
Verlagsgesellschaft Leipzig

, back to Claudio:

>"Compositional relationship between components of an organism may be an
>argument for homologies between parts of organisms."

Composition is not a very good term for tagmata, it makes me more think =
of music!!!

What about this free interpretation:

Relations between the song components of one organism may be an argument =
for homologies between parts of songs of different organisms.=20

There are examples in birds like Fringilla coelebs (Buchfink in german) =
adopting parts=20
of the songs of Picoides major (Buntspecht in german).
I don=B4t know about this but I can imagine that one species only picks =
up the homologous
song parts of another species..........
It will be pretty nice if someone else continues this line.........
Anyway, this shows us that, beside the usual homology which is a =
hereditary homology, there are also cultural or traditional homologies.

Music fans!!!!!! This is not my field, but I guess all of the three =
points, Remane made,
can be applied to music as well!!!!!!!!

All the ideas presented here, were inspired by a pretty small, but =
extremely useful german
paper back book:=20

                Walter Sudhaus & Klaus Rehfeld (1992)
                Einf=FChrung in die Phylogenetik und Systematik
                Gustav Fischer Verlag, Stuttgart, Jena, New York

                        Cheers,    Thomas