[R-sig-eco] Distinctiveness and contribdiv( )

Peter Solymos solymos at ualberta.ca
Wed Dec 1 19:35:58 CET 2010

Not exactly clear what you want, but Lu et al. 2007 describes the
differentiation coefficient D that is the sum(beta)/sum(gamma) and can
be obtained as attributes(contribdiv(x))$diff.coef . Note also that
there is a link between diversity partitions and distance indices so
you might as well use the components from the contribution diversity
approach. Or is it something like irreplaceability in the reserve
selection literature you need?

Péter Sólymos
Alberta Biodiversity Monitoring Institute
and Boreal Avian Modelling project
Department of Biological Sciences
CW 405, Biological Sciences Bldg
University of Alberta
Edmonton, Alberta, T6G 2E9, Canada
Phone: 780.492.8534
Fax: 780.492.7635
email <- paste("solymos", "ualberta.ca", sep = "@")

On Wed, Dec 1, 2010 at 11:17 AM, Pekin, Burak K <bpekin at purdue.edu> wrote:
> Hello, Is there a diversity index similar to the 'contribution diversity approach' contribdiv()in vegan that reflects only  the compositional 'distinctiveness' of a site within a region. contribdiv()combines 'distinctiveness' with a within-site diversity measure such as richness, I on the other hand am looking for an index that measures only the relative number of species within a site that are 'distinct' or 'unique' within a region.
> Cheers,
> Burak
>        [[alternative HTML version deleted]]
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