Girvan et al PNAS 2002 food web

This dataset is a food web of marine organisms living in the Chesapeake Bay, a large estuary on the east coast of the United States originally compiled by Baird and Ulanowicz and contains 33 vertices representing the ecosystem's most prominent taxa. Most taxa are represented at the species or genus level, although some vertices rep resent groups of related species. Edges between taxa indicate trophic relationships|one taxon feeding on another. Although relationships of this kind are inherently directed, we here ignore direction and consider the network to be undirected.