1 Supporting online materials An interaction switch predicts the nested architecture of mutualistic networks Feng Zhang 1 , Cang Hui 1 and John S. Terblanche 2 1 Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa; 2 Department of Conservation Ecology and Entomology, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa Section 1. Mutualistic Network Database The Mutualistic Network DataBase (Table S1) was compiled either from the Interaction Web DataBase, Bascompte et al.’s (2006) online Database, or Rezende et al.’s (2007) online DataBase. NODFs (Almeida-Neto et al., 2008) were computed using the software Aninhado 3.0 (Guimarães & Guimarães 2006). The methods of simulation and predictions are detailed in main manuscript. Table S1: Mutualistic Network Database Network Type Plant number Animal number Interaction number NODF Predicted NODF Standard deviation P01 Pollination 87 98 372 15.11 13.54 1.52 P02 Pollination 43 62 199 17.99 19.55 2.77 P03 Pollination 41 28 91 20.48 17.11 3.66 P04 Pollination 12 102 167 30.78 18.10 1.54 P05 Pollination 13 13 71 84.93 54.61 5.03 P06 Pollination 96 275 923 14.74 24.15 1.81 P07 Pollination 17 61 146 52.27 30.45 4.14 P08 Pollination 16 36 85 35.66 27.98 4.25 P09 Pollination 11 38 106 35.97 43.24 4.04 P10 Pollination 24 118 242 15.39 32.38 4.87 P11 Pollination 31 75 453 35.32 38.68 1.99