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Table 2 Nitrogen and carbon isotopic discriminations on amino acids in the four combination samples

From: A new insight into isotopic fractionation associated with decarboxylation in organisms: implications for amino acid isotope approaches in biogeoscience

Consumer - diet combination Δ (δconsumer − δdiet) value (‰)
Phe Val Leu Ile Gly Ala Glu
Mean SD Mean SD Mean SD Mean SD Mean SD Mean SD Mean SD
Δδ15N (‰)
 Sea sulg - Sponge* 0.5 0.3 4.8 0.6 3.0 0.6 5.6 0.4 1.6 0.6 5.5 0.6 7.9 0.3
 Ladybug beetle - Aphid** 0.3 0.3 6.5 0.5 5.3 0.5 3.6 0.6 6.6 0.5 4.5 0.5 7.7 0.3
 Green lacewing #1 - Fall armyworm *** 0.4 0.3 5.5 0.3 3.6 0.5 3.3 0.4 0.8 0.7 5.4 0.4 8.0 0.4
 Green lacewing #2 - Green lacewing #1*** 0.5 0.3 5.5 0.3 4.2 0.4 3.8 0.5 0.8 0.3 5.5 0.4 8.1 0.5
Δδ13C (‰)
 Sea sulg - Sponge* -0.3 0.8 0.0 0.7 0.4 0.7 0.4 0.9 11.9 0.6 3.9 0.4 3.5 0.5
 Ladybug beetle - Aphid** -0.5 0.8 -1.0 0.8 -1.0 0.9 -0.4 0.6 3.0 1.1 4.9 0.8 2.2 0.2
 Green lacewing #1 - Fall armyworm *** -0.6 1.1 -0.9 0.5 0.3 0.2 -0.2 0.6 17.3 0.5 2.8 0.3 1.0 0.2
 Green lacewing #2 - Green lacewing #1 *** 0.2 1.1 0.3 0.9 -0.5 0.5 0.5 0.9 17.5 0.7 2.6 0.4 0.2 0.9
  1. * SD represents 1σ propagation error for comparing 1σ of Sea slug (3 injections for 1 individual) and Sponge (3 injections for 1 aggregation)
  2. ** SD represents 1σ propagation error for comparing 1σ of Ladybug beetle (3 injections for 5 individuals) and Aphid (3 injections for 1 colony)
  3. *** SD represents 1σ propagation error for comparing 1σ of consumer and diet (1 injections for 4 trophic groups)