Hi Rajasri, Sorry for coming to this late. Is your concern that in the case of small patches you've sampled completely, but in the case of large patches, some species may have gone undetected?
If that's the case, using Chao's indices might be a good option. They try to take account of "unseen" species. The paper is by Chao et al. 2005 in Ecology Letters. Here's a link: http://chao.stat.nthu.edu.tw/paper/2005_EcologyLetters_8_P148.pdf This might not be helpful, in particular you'll need species abundances or replication through time. Also, I'm not sure what the uniform area concept is, so I just took a guess. Hope it's helpful. Best of luck, Andy On Mon, Jun 13, 2011 at 10:23 PM, Rajasri Ray <rb...@hotmail.com> wrote: > Hello, > I am trying to compare species composition among different patches > which vary in their sizes to a great extent.I am planning to compute > Jaccard's similarity index for this. For species enumeration, in some > patches I have documented presence of all members (due to very small size > of > the patch ~ 80 - 500 sq. m).There is problem to apply uniform area concept > for species composition. I would like to know whether Jaccard's is suitable > for that kind of comparison. > Thanks > Rajasri >
