Hello Andrea

>(say, belonging to the same genus) could be compared to differences in
>allometric trajectories between the ingroup species and an outgroup
>species (for instance, a species of a different but closely related
>genus).

did you try the MANCOVA design at lower taxonomic sacles? My experience
is that often "forced" common allometry is somewhat "artificial" and
that tests of parallelism at lower taxonomic scales (species level) give
some hints towards your suspects.... they also help to assess the
differences in morphological terms.

markus







>Any suggestion, please?
>Id also be curious to know whether or not you would try to take into
>account the fact the samples are not statistically independent because
>of taxonomic hierarchy when performing these tests.
>
>A second, related, question. What are the possible biological
>interpretations of having trajectories with similar slopes but
different
>intercepts? (Differences arising early, i.e. before birth, in
>development??? Other interpretations?).
>
>Thanks a lot, in advance, for your help.
>Best
>
>Andrea
>
>
>Andrea Cardini
>Istituto di Medicina Legale e delle Assicurazioni
>Universit degli Studi di Milano
>via Mangiagalli 37
>Milano 20133, Italy
>tel. 0039 02 50315678/9
>[EMAIL PROTECTED]
>
>and
>
>Division of Mammals, Department of Vertebrate Zoology
>NHB 390, MRC 108
>National Museum of Natural History, Smithsonian Institution
>P.O. BOX 37012
>Washington, DC 20013-7012, USA
>tel. 202 3571476
>[EMAIL PROTECTED]
>
>
>
>
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Markus Bastir
Atapuerca Research Team
Department of Paleobiology
Museo Nacional de Ciencias Naturales
Jos. Abascal 2,  28006 Madrid, Spain.

Tel.:   +34 91 411 13 28
Fax:    +34 91 564 50 78
mailto: [EMAIL PROTECTED]
http://www.terra.es/personal/bastir 
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