Computer / System
Double-click on autonw.exe.
It will expand in a user chosen directory
food web is a set of species related by trophic
interactions (who eats whom) within an ecosystem. A food web comprising
S species can be represented by a directed
network whose nodes
are the species and whose arcs describe the feeding links.
network representing the food web, there is an arrow joining each prey
(resource) species to its predator (consumer) species.
A food web can be represented by a (0,1)-matrix A = (aij) of size S, where aij = 1/0 depending of the presence/absence of a feeding link between species i and species j. A matrix W = (wij) ascribing non negative weights wij to trophic links can also be introduced (A and W have the same non zero entries). The matrix of weights represents biological values associated with trophic interactions, like energy flux, probability of capture, consumption rate.
With the n_w program, several food webs can be studied simultaneously, observed ones, which are specified in text files, or synthetic (random) ones, which are created using predefined models. The studied networks can be edited and displayed graphically. Results are stored in text and graphic files.
Analysis of structural and functional properties of empirical and synthetic trophic networks:
Gauzens B, S Legendre, X Lazzaro & G Lacroix. 2013. Food-web aggregation, methodological and functional issues. Oikos 122:1606–1615.
Mail to Stéphane Legendre
Jacques Gignoux, Gérard Lacroix, Xavier Lazzaro, Elisa Thébault.