Dear Edgar, Semilandmarks should be slid during Procrustes superimposition; treating them as fixed landmarks will only add error into your analyses. Therefore the answer is simply a) use software that supports semilandmark sliding. Your options are great. And when it comes to deciding whether to minimise for bending energy or Procrustes distance, I suggest reading Gunz & Mitteroecker 2013 here <http://www.italian-journal-of-mammalogy.it/article/view/6292>. For GPA and further analyses, I suggest using the TPS suite and MorphoJ, or geomorph if you are confident with script-based analyses.
Emma ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Emma Sherratt, PhD. Postdoctoral Researcher in the Keogh Lab <http://biology-assets.anu.edu.au/hosted_sites/Scott/> Division of Evolution, Ecology & Genetics Research School of Biology 116 Daley Road The Australian National University Acton, ACT 2601 AUSTRALIA email: emma.sherr...@gmail.com tel: +61 2612 53029 mob: +61 4234 19966 Twitter: @DrEmSherratt <https://twitter.com/DrEmSherratt> Caecilians are legless amphibians... * __ (\ .-. .-. /_") \\_//^\\_//^\\_// `"` `"` `"`* learn more about them here: www.emmasherratt.com/caecilians On 12 May 2016 at 09:26, Edgar Esteban Herrera Collazos < edgaresteba...@gmail.com> wrote: > Dear Morphometricians, > > I'm conducting a study on fish taxonomy using integrative taxonomy, my > first approach is using Geometric Morphometrics. > > For GM I decided to use Landmarks and Semilandmarks. My question is: Is > there any difference or advantage between using a) a software that supports > semilandmark sliding or b) by entering each semilandmark as a landmark? > > Best regards > > -- > Edgar Esteban Herrera Collazos B.Sc. > > Postgraduate Student at Pontificia Universidad Javeriana > Ichthyology Laboratory 108B Ed 53 - 3208320 Ext 4127 > ----------------------------------------------------------------------- > Estudiante de Posgrado en la Pontificia Universidad Javeriana > Laboratorio de Ictiología 108B Ed 53 - 3208320 Ext 4127 > > > -- > MORPHMET may be accessed via its webpage at http://www.morphometrics.org > --- > You received this message because you are subscribed to the Google Groups > "MORPHMET" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to morphmet+unsubscr...@morphometrics.org. > -- MORPHMET may be accessed via its webpage at http://www.morphometrics.org --- You received this message because you are subscribed to the Google Groups "MORPHMET" group. To unsubscribe from this group and stop receiving emails from it, send an email to morphmet+unsubscr...@morphometrics.org.
