Section S1 Mutualistic Network Database.

Section S2 Holling’s type II functional response for mutualistic networks.

Section S3 The dynamics of nestedness and relative nestedness.

Section S4 The effect of initial structures of the interaction matrices on the stable level of nestedness.

Section S5 Probability distribution of interaction benefits.

Section S6 Predicting other patterns in mutualistic networks.

Section S7 Species rank curves predicted from the model.

Section S8 Antagonistic interaction model and results.

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