R help - Jun 2012 - niche.width functions

Hello,

I want to calculate niche width of a species in a community using Smith's
selectivity measure (Smith 1982), as described in Ecological Methodology
(Krebs 1999).  Is there a package/function available that can do this?

I have searched and found the niche.width function in SPAA (below).
However, the indices used are "shannon" and "levins" , which
don't take
resource availability into account. Smith's would take resource
availability into account.


niche.width {spaa}

Description
Compute niche width of the species in a community.

Usage
niche.width(mat, method = c("shannon", "levins"))


Thanks!
Carmen

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