questions about food web metrics

Dear R-sig-eco group,

I'm working on a food web analysis project in R, and rather than re- 
invent the wheel, I was wondering if any of you had suggestions for  
packages, or had written code yourselves for calculations of some of  
the more involved algorithmic metrics, such as

Number of Food Chains
Average (and variance in) Food Chain Length
Shortest Path Length between two species
Longest Path Length between two species (all of which I guess feeds  
back to the ave. food chain length...)
Finding Loops (chains in which a taxa occurs twice)
Trophic Similarity between species
Clustering Coefficients

and any other food web metrics of interest.  Also, any methods for  
dealing with network stability and the analysis of weighted networks  
not already in the sna or network package - particularly those dealing  
with food webs - would be great.

In addition to my own work, I'd like to compile all of these methods  
into a foodweb package to post on CRAN for general usage, so, any  
contributions would be most welcome!

-Jarrett




----------------------------------------
Jarrett Byrnes
Postdoctoral Associate, Santa Barbara Coastal LTER
Marine Science Institute
University of California Santa Barbara
Santa Barbara, CA 93106-6150
http://www.lifesci.ucsb.edu/eemb/labs/cardinale/people/byrnes/index.html


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