Dear Jari, 

For what it's worth, I could see the need in my own work for species accumulation curves with variable sampling effort. 

Scott Chamberlain
On Tuesday, February 22, 2011 at 2:26 AM, Jari Oksanen wrote:
Vanessa Francisco <vanewagen <at> gmail.com> writes:
> 
> > 
> > Hello! I'm a PhD student working with coral reef fish diversity in Mexico.
> > I want to do species accumulation curves but I have differential sampling
> > effort for each "sample".
> > Do you know or have developed an R script that consider the differential
> > effort of each sample?
> > PRIMER and other programs use each pack of species as a replica without the
> > possibility of telling the program that the first group of species (sample)
> > was collected during a 30 minutes dive and the second group (sample) was
> > taking after 60 minutes dive and so on.
> > I would really appreciate any kind of help!
> 
> Vanessa,
> 
> I speak only for the vegan package: I don't know if there is solution elsewhere
>  in R. I can certainly say that this cannot be done in vegan. However, it seems 
> like this could be "easily" implemented in some accumulation methods, but 
> not with all. Is this weighted SAC published somewhere? If I "re-invent" it, I'd 
> like to see what others have done. How keenly and urgently you need this? 
> This will require a bit work since the structure of function needs changes 
> although the idea is simple, and I'd like to know if that work is of any use to 
> anyone before starting. Of course, if this already is in R, I won't do this.
> 
> Cheers, Jari Oksanen
> 
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