Gareth Russell wrote: > Alexandre, > > The Species Richness module on www.eco-tools.net calculates the same > statistics as EstimateS. > There is also a Mathematica notebook you can download that allows you to do > the calculations on > your own computer, if you have access to Mathematica. I mention it because > you could easily add > a few lines to make it loop through a series of files. > > If you DO have access to Mathematica, and would like to try this, I would be > happy to add those > lines in the 'examples' section and send the notebook to you. > > Gareth Russell > > On Thu, 16 Nov 2006 15:25:45 -0200, Alexandre Souza <[EMAIL PROTECTED]> wrote: > >> Dear friends, >> >> In my present research, I am willing to estimate the species richness of >> ca 200 forest > communities, sampled by the Brazilian government. Samples are relatively > small (0,1 ha - 10 > subsamples of 0,01ha each), and I need a software that calculates > nonparametric richness > estimators for more than one community at a time. >> Does any of you know of any software that do that? As far as I >> understood, EstimateS, the > most popular package, does not perform multiple tests. >> Thank you in advance for any suggestions,
Someone has already mentioned my functions that Jari O. put into vegan: these can easily be looped over (optimally with apply()!). However, I feel I should point out that I was hesitant to have them publically available, because I can't see how we can even tell if any species richness estimator is any good: Link, W.A., 2003. Nonidentifiability of Population Size from Capture-Recapture Data with Heterogeneous Detection Probabilities. Biometrics 59: 1123-1130. O'Hara, R.B., 2005. Species richness estimates: How many species can dance on the head of a pin? J. Anim. Ecol., 74: 375-386. The non-parametric estimators are fine to use as lower bounds (Chao2 was derived as such: I haven't checked it formally, but I suspect that ACE assumes the abundance distribution is symmetric). Bob -- Bob O'Hara Department of Mathematics and Statistics P.O. Box 68 (Gustaf Hällströmin katu 2b) FIN-00014 University of Helsinki Finland Telephone: +358-9-191 51479 Mobile: +358 50 599 0540 Fax: +358-9-191 51400 WWW: http://www.RNI.Helsinki.FI/~boh/ Journal of Negative Results - EEB: www.jnr-eeb.org
