[Vegan-commits] species accumulation curves

[Jari Oksanen]

Function specaccum() in vegan has argument 'w' for weights or sampling effort. Use size are as weight.

Cheers, Jari Oksanen
________________________________________
From: vegan-commits-bounces at r-forge.wu-wien.ac.at <vegan-commits-bounces at r-forge.wu-wien.ac.at> on behalf of Mark van Kleunen <mark.vankleunen at uni-konstanz.de>
Sent: 07 November 2014 13:21
To: vegan-commits at r-forge.wu-wien.ac.at
Subject: [Vegan-commits] species accumulation curves

Hi,

Is there a function in vegan or in another R package that allows one to
make species accumulation curves, in which the the cumulative number of
species is not fitted against the number of sites (as done in specaccum)
but against the cumulative area of the sites. Take as example that one
has a big matrix of the presence-absence of species in multiple European
countries, and wants to know the relationship between species richness
and area. So, I would like to randomly select one country, keep the
number of species and the area of that country, then randomly select
another country, combine it with the first country, keep the cumulative
number of species and the cumulative area of both countries, and so on.
This should then be repeated a 100 or 1000 times to get some confidence
intervals. Is this possible with any of the current functions?

best wishes,
Mark van Kleunen

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