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Additional Supporting Information may be found in the online version of this article under the DOI reference:DOI: 10.1111/j.1365-2311.2010.01190.x

Table S1. Average number of individuals detected in the monthly bird censuses (point counts) inside the grove (or flying over it) and outside the grove. Only species considered as insectivorous are reported (see text). An asterisk (*) indicates that the species feeds on earwigs, and a (#) symbol indicates that the species can feed on canopy insects (in both cases the information is taken from Cramp et al ., 1988–1994).

Table S2. Summary of a repeated measures anova of arthropod abundance between ant-excluded and bird-excluded trees from February to November. Codes for arthropod groups as in Table 1.

Table S3. Complete list of all spiders collected using beating trays in 11 samplings dates from January to November 2006 and from 24 citrus trees (8 control, 8 ant-excluded, 8 bird-excluded). A total of 2051 specimens were analysed, of which only 158 (7.7%) were adults (105 females and 53 males). As most of the specimens were juveniles their determination was difficult and, in many cases, it was not possible to go beyond the genera level (Anyphaena, Cyclosa, Lathys, Zelotes, Cheiracanthium, Oxyopes, Philodromus, Salticus, Heliophanus, Anelosimus, Archaearanea, Dipoena, Xysticus, Ozyptila) and in a few cases beyond the family level (10 Araneidae, 1 Gnaphosidae, 81 Linyphiidae, 5 Salticidae, and 6 Theridiidae).

Table S4. Summary of a repeated measures anova of the abundance of spider families and of spiders' diversity (both measured as the number of species S and as the Shannon diversity index H). Between groups factor: treatment (ant-excluded vs. bird-excluded); within groups: time (February to November). Codes for spider families as in Table 2.

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