Figure 5

Relationship between total () and reciprocated (
) or non-reciprocated (
) strength in four weighted networks in increasing order of reciprocity ρ: (a) the Everglades Marshes foodweb, (b) the neural network of C. elegans, (c) the World Trade Web in the year 2000 and (d) the social network of a fraternity at West Virginia College (black: real data, blue: the Weighted Reciprocity Model, orange: the Non-reciprocated Strength Model, green: the Reciprocated Strength Model; all such models reproduce the global level of reciprocity but not necessarily the local reciprocity structure).