-------- Original Message -------- Subject: Re: Visualization of non-allometric shape change in MorphoJ Date: Mon, 23 Jan 2012 12:35:40 -0500 From: Marko Djurakic <[email protected]> To: [email protected] On 20.1.2012 15:34, morphmet wrote:
-------- Original Message -------- Subject: Re: Visualization of non-allometric shape change in MorphoJ Date: Fri, 20 Jan 2012 03:27:17 -0500 From: andrea cardini <[email protected]> To: [email protected] Dear Marko, Viscosi and I (http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0025630) tried to provide a simple (and sometimes simplistic) step by step guideline to this and some other analyses in taxonomic studies using GMM. We also describe how to first use TPSRegr (for 2D data) to test slopes, as described by Rohlf in the help file, before trying any 'size-correction'. In the paper you'll find refs pointing to more sophisticated and potentially more accurate approaches. I would try to replicate the analysis following that guideline. If you still have problems, let me know. I'll do my best to find a spare moment to see if I can help (after the next week!). The V&C paper is on tree leaves but most of what we describe is pretty general. I can send you a pdf of that paper with a comment on how to modify one of the analyses for studies on animals. However, this does not concern the 'size-correction', which is the same regardless of whether it's leaves, bones or other structures. Good luck. Cheers Andrea Dr. Andrea Cardini Researcher in Animal Biology Dipartimento di Biologia, Universitá di Modena e Reggio Emilia, via Campi 213, 41100, Modena, Italy tel: 0039 059 2055017 ; fax: 0039 059 2055548 Honorary Fellow Functional Morphology and Evolution Unit, Hull York Medical School University of Hull, Cottingham Road, Hull, HU6 7RX, UK University of York, Heslington, York YO10 5DD, UK Adjunct Associate Professor Centre for Forensic Science , The University of Western Australia 35 Stirling Highway, Crawley WA 6009, Australia E-mail address: [email protected], [email protected], [email protected], [email protected] Webpage: http://sites.google.com/site/hymsfme/drandreacardini Datasets: http://ads.ahds.ac.uk/catalogue/archive/cerco_lt_2007/overview.cfm#metadata Editorial board for: Zoomorphology: http://www.springer.com/life+sciences/animal+sciences/journal/435 Journal of Zoological Systematics and Evolutionary Research: http://www.wiley.com/bw/journal.asp?ref=0947-5745&site=1 Hystrix, the Italian Journal of Mammalogy: http://www.italian-journal-of-mammalogy.it/
Dear Andrea thanks for your kind reply and suggestion how to overcome struggles that I had. I have already read your article and found it very valuable and useful in general. Since I was interested in specific and unexpected output from MJ (precisely the same pattern and direction of allometric and nonallometric component) I did not repeat proposed steps by you on my dataset yet, but surely I will do that in the next days. Regarding my question, I have to say that MorphoJ works well, because I performed same steps on a dataset (third one) from my colleague, Vida Jojoc, on her computer and we obtained results but two components were different, as I expected. So, I have to check why this does not work on my datasets, at least on my computer. At the end, I have a few questions regarding corrections for sexual dimorphisam that you proposed in Chapter 8 in the book “Morphometrics for Nonmorphometricians”. Since it is unrelated to this topic, I will write to you directly (personal email address) if you find it appropriate. Thanks again, Marko -- Marko Đurakić, PhD student, University of Novi Sad Faculty of Sciences Department of Biology and Ecology Dositej Obradović Square 2 21 000 Novi Sad Serbia e-mail:[email protected]
