Dear Manuel,

I did it with vegan function *diversityresult().* Look to R help for this
function there are many parameters you can modify and add to it.

The code is:

>library(vegan)
>diversityresult(X, index="richness")

I hope it helps,


Gian


-- 
Gian Maria Niccolò Benucci
Ph.D. Candidate

University of Perugia
Department of Applied Biology

Borgo XX Giugno, 74
I-06121 - Perugia, ITALY
Tel: +39.0755856433
Fax: +39.0755856069
Email: gian.benucci@gmail.com


On 11 February 2011 17:18, Manuel Spínola <mspinola10@gmail.com> wrote:

> Dera list members,
>
> I am trying to estimate species richness for several single sites and for
> the collection of all sites.  I am looking at the specpool and estimateR at
> the vegan package.
>
> Is there any other alternatives in R?
>
> How these estimates are influenced by diffrent sampling effort at each site
> (i.e., the number of visits to the sites varies)?
>
> I am trying to get also an estimate of the detection probability, but it
> seems that this parameter is not included in those functions.
>
> Best,
>
> Manuel
>
> --
> *Manuel Spínola, Ph.D.*
> Instituto Internacional en Conservación y Manejo de Vida Silvestre
> Universidad Nacional
> Apartado 1350-3000
> Heredia
> COSTA RICA
> mspinola@una.ac.cr
> mspinola10@gmail.com
> Teléfono: (506) 2277-3598
> Fax: (506) 2237-7036
> Personal website: Lobito de río <
> https://sites.google.com/site/lobitoderio/>
> Institutional website: ICOMVIS <http://www.icomvis.una.ac.cr/>
>
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