Dear Bryan,
this is something I used to be more interested in
some time ago and I've never done any systematic review of the literature.
In my experience, although it is often assumed
that allometry confounds the phylogenetic signal
(as it was apparently the case in the radiation
of vervet monkeys
doi:10.1016/j.jhevol.2007.09.022), I would not be
so sure that one can easily generalize. We have a
recent example in the temporal bone of apes (
http://dx.doi.org/10.1016/j.jhevol.2015.06.012 )
where we found exactly what you mentioned (the
signal in shape was dominated by allometry);
however, interestingly it was size and allometry
that had the stronger signal and controlling for
allometry almost removed any congruence of shape with phylogeny.
It would be really nice to see an updated review
on this issue sooner or later in the literature.
Cheers
Andrea
At 14:15 28/10/2015, you wrote:
Morphometricians,
Id like to gather some opinions on measuring
phylogenetic signal from GM data.Â
For many GM analyses, size-free shape data
(e.g., residuals from a regression) are used in
analyses of variation/covariation. However, I
less often see size and shape analyzed
independently when measuring phylogenetic
signal. If most of the shape variation is
allometric, it would seem that the phylogenetic
signal for uncorrected shape variables may
approach the strength of the phylogenetic signal
for size alone. However, I have not found this
to be the case with several datasets.
Has anyone examined this in detail?Â
Thanks-
-Bryan
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