S1 Supporting Information -

Table A: VIP scores for the volatile compounds in pairwise comparisons of untreated, starved then external microbiome disrupted or starved unparasitised- or C. glomerata parasitised caterpillars (Pieris brassicae). Bold face VIP scores are higher than 1 and indicate the most influential VOC for separation of the mentioned treatments. Compounds and pairwise comparisons in green are correlated with the presence/absence of frass. Compounds and pairwise comparisons in yellow are correlated with parasitism status. Table B: Full overview of caterpillar-associated bacterial communities of untreated, starved then external microbiome disrupted or starved C. glomerata parasitised or unparasitised caterpillars (P. brassicae). Table C: Primer design and sample-specific barcodes. Table D: Composition of mock community. Table E: Identification of bacterial zero radius operational taxonomic units (ZOTUs) according to the Silva v1.23 database and distribution over the investigated samples. (XLSX)