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Table S1. The 1.5 km radius landscape variable loadings on PCA axes 1–7 and the percentage variance explained by each principal component, by the percent cover of semi-wild annual and perennial vegetation, annual crops, conifers, coyote brush, Eucalyptus, suburban residential buildings and yards, isolated rural buildings and yards, oak woodlands, perennial crops, riparian and marsh, sage brush, and wild vegetation richness. Variables with strong loadings are indicated in bold. Note that in this analysis PC1 has negative loadings for semi-wild perennial vegetation and positive loadings for annual crop, in contrast to the 0.5 km scale analysis (the signs of these loadings are essentially arbitrary).

Table S2. Tachinid species collected with Malaise traps in organic farms in 2005 and 2006. M, J, and S indicate the number of specimens collected in sample in May 2006, July 2005, and September 2005.

Table S3. A summary of generalized linear models selected by AIC for analyses employing principal components (left) and specific landscape variables (right) at the large, 1.5 km scale. Significant P-values after Holm's sequential Bonferroni correction for each data set are indicated in bold. See Table S1 for explanations of variable abbreviations.

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