My biggest issue with this setup, as you give it, is that it isn't clear how you'll make this into a test - is there some summary statistic of the null morphospace you'll be generating many times, and then comparing that distribution to the observed value of the observed, real data? I would suggest thinking more about this aspect.
I hope this helps, -Dave On Sun, Dec 16, 2018 at 5:35 PM françois RIGAL <frantz.ri...@hotmail.fr> wrote: > > Hi all > I have a conceptual question related to the use of separate models of > evolution to reconstruct a morphospace. > Ok let’s consider that I have 6 endemic species on an island-like habitats > for which I have morphological traits. I want to generate a null expectation > for the morphospace of this community keeping the phylogenetic structure > unchanged. These 6 species belong to 3 different clades (2 species each). > Let’s consider that I have the phylogeny and the traits for all the mainland > representative of those three clades. My null hypotheses behind would be that > endemic species evolve at the same rate/same direction that mainland species. > My idea is the following: I fit different models of evolution to each clade > separately (endemic species included) e.g. BM, OU and use the parameters of > the best model to simulate random traits for each clade. I do 1000 runs and, > at each run, I pick up from my random clade-set of traits the 2 endemic > species, and re-create therefore a null morphospace for my community of 6 > endemic species. > So far, I cannot think about any possible “pitfalls”, but, since I did not > find any similar approaches in the literature, I am wondering whether it is > problematic to mix in the same null morphospace null trait values that have > been generated from distinct phylogenies and models of evolution. > any comments / advices are welcome > Many thanks > > François > > [[alternative HTML version deleted]] > > _______________________________________________ > R-sig-phylo mailing list - R-sig-phylo@r-project.org > https://stat.ethz.ch/mailman/listinfo/r-sig-phylo > Searchable archive at http://www.mail-archive.com/r-sig-phylo@r-project.org/ -- David W. Bapst, PhD Asst Research Professor, Geology & Geophysics, Texas A & M University Postdoc, Ecology & Evolutionary Biology, Univ of Tenn Knoxville https://github.com/dwbapst/paleotree _______________________________________________ R-sig-phylo mailing list - R-sig-phylo@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-phylo Searchable archive at http://www.mail-archive.com/r-sig-phylo@r-project.org/
