Table 2 Nitrogen isotopic composition of glutamic acid (δ15NGlu) and phenylalanine (δ15NPhe), and estimated trophic position (TPGlu/Phe) and the propagation error of two non-spinose planktonic foraminiferal species (Neogloboquadrina dutertrei and Pulleniatina obliquiloculata)
Species | Water depth (m) | Number of specimens | δ15NGlu (‰, relative to air) | δ15NPhe (‰, relative to air) | TPGlu∕Phe | Propagation error |
|---|---|---|---|---|---|---|
Neogloboquadrina dutertrei | 0–20 | 202 | 15.8 | 1.5 | 2.44 | 0.20 |
20–50 | 353 | 13.6 | 0.0 | 2.34 | 0.20 | |
50–100 | 50 | 13.3 | 0.3 | 2.26 | 0.20 | |
100–200 | 18 | 15.9 | 1.0 | 2.52 | 0.20 | |
Pulleniatina obliquiloculata | 0–20 | 60 | 11.4 | -0.3 | 2.09 | 0.21 |
20–50 | 137 | 14.1 | 0.9 | 2.28 | 0.20 | |
50–100 | 45 | 10.1 | 0.3 | 1.84 | 0.23 | |
100–200 | 14 | 7.1 | 3.3 | 1.05 | 0.67 |