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Table S1. Ordered matrix of interactions observed between oil-flowers of the family Malpighiaceae (rows) and oil-collecting bees (columns) in the studied Caatinga area. Cell values represent the number of visits that a j bee species made to an i plant species. ‘Degree’ is the number of interactions (binary) observed for a given species.

Table S2. Results from the extinction simulations based on removal of single species from the network. For each species we present information on its taxonomic group (animal or plant), its ecological category (see Methods), the label used to identify it in graphs, its scientific name, its degree (K - number of interactions), relative degree (Kr - proportion of interactions), relative change in nestedness caused by its removal (NODFr), and the number of coextinctions caused by its removal (C). *Bees that are not oil-collectors.

Table S3. Thirty-two data sets downloaded from the website ‘Interaction Web Database’ (Vazquez & Melian 2008) that we used in the present study for comparison with the oil-flower subnetwork.

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