Fig. 4From: Altered complementary feeding strategies of the consumers Hydrobia ulvae and Idotea emarginata via passive selectivitySelectivity index Q (Δδ13C/Δδ15N × 1,000) of H. ulvae and I. emarginata in single-grazer (H and I) and mixed grazer treatments (HI) on the first (day 1) and the second day (day 2) of incubation (mean ± SE)Back to article page