Fig 3. Topology of bipartite country-food product networks.

(a) The nestedness (measured by the NODF given by [28] Eq (1)) of country-food production bipartite empirical networks (black point) and corresponding 100 randomly assembled networks of the same size and connectivity (blue points denote the mean and the bands are one standard deviation above and below the mean) for each year; (b) The cumulative in-degree and (c) out-degree distribution of the country-food production network for the years 1992-2011 (gray dots). These are distributed consistently with Weibull distribution (red think line) with parameters α = 2.510, β = 30.000, μ = −0.387 and with α = 1.774, β = 32.230, μ = 0.609, respectively.