Re: [MORPHMET] Ontogenetic changes in morphology

2015-02-18 Thread Anneke van Heteren
Dear Adeline Yong Right now you are essentially plotting size (of the claw) against size (of the crab). What you are interested in is shape against size. I am not sure what program you are using now, but I would suggest MorphoJ, as it is quite user friendly. You should do a multivariate

Re: [MORPHMET] Ontogenetic changes in morphology

2015-02-18 Thread Pere M. Parés-Casanova
You can also perform this analysis as a multivariate linear model (using first variable, ln(CS) as independent variable) with PAST. Nervertheless, number of Procrustes versus number of specimens can be a problem if you sample size is not large enough. Pere M. On Dm, Febrer 18, 2015 09:06,

[MORPHMET] Ontogenetic changes in morphology

2015-02-17 Thread Adeline Yong
Hi Everyone, I am exploring the use of GMM to study the ontogenetic changes of claw morphology in one species of crabs. The tips of the crab claws changes in curvature (shape) as they grow and there are distinct differences if I compare the claws of the juvenile crabs and the adults. However, the

Re: [MORPHMET] Ontogenetic changes in morphology

2015-02-17 Thread Carmelo Fruciano
Hi Adeline, I'm not sure if this helps with your problems, but what you are describing reminds me of two things: - MANCOVA using shape variables as dependent, species as categorical predictor and size (either of the claw or of the body) as covariate and testing not only for the main