I want to compare skull morphology using geometric morphometrics from several species with different diets in a same genus. But I don't know much about how to analyze these shape data. What statistical analysis can I do? I know that principal component analysis can be done to visualize shape variations. So can I use the original coordinate data? Do I need to remove the effects of size and phylogenetic relationships to do principal component analysis? If so, do I use PGLS to do the regression of shape and size, and then use the obtained residual as the principal component analysis? In addition to this analysis, what other aspects can I do? Looking forward to reply.Thanks very much!
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