Table 2.
Nitrogen isotopic composition of glutamic acid (δ 15NGlu) and phenylalanine (δ 15N Phe), and estimated trophic position (TPGlu/Phe) of rocky‐shore foraminifera
| Sample ID | δ 15NGlu (‰)a | δ 15NPhe (‰)a | TPGlu/Phe b | Propagation errorc | |
|---|---|---|---|---|---|
| P. opercularis | 160108‐3 | 7.8 | 2.7 | 1.2 | 0.35 |
| 111205‐4 | 8.0 | 3.3 | 1.2 | 0.40 | |
| 120607‐1 | 16.6 | 5.7 | 2.0 | 0.22 | |
| 120607‐2 | 16.2 | 5.6 | 1.9 | 0.22 | |
| 160118‐2 | 11.8 | 2.0 | 1.8 | 0.23 | |
| G. patelliformis | 120606‐7 | 14.4 | 3.4 | 2.0 | 0.22 |
| A. quadrangularis | 120607‐3 | 15.3 | 5.2 | 1.9 | 0.22 |
| 120607‐4 | 15.7 | 5.9 | 1.8 | 0.23 | |
| 160112‐2 | 10.0 | 0.0 | 1.9 | 0.22 | |
| 160118‐3 | 11.1 | 2.7 | 1.7 | 0.24 | |
| E. crispum | 120606‐1 | 9.9 | 4.6 | 1.2 | 0.34 |
| 120606‐2 | 10.0 | 4.5 | 1.3 | 0.33 | |
| 160112‐3 | 12.0 | 4.1 | 1.6 | 0.25 | |
| 160118‐4 | 10.4 | 4.8 | 1.3 | 0.32 | |
| P. nipponica | 160108‐4 | 11.2 | ‐0.9 | 2.2 | 0.21 |
| 120606‐5 | 15.3 | 1.5 | 2.4 | 0.20 | |
| 120606‐6 | 16.2 | 1.9 | 2.4 | 0.20 | |
| C. lobatulus | 160112‐1 | 10.8 | ‐0.9 | 2.1 | 0.21 |
| 120606‐3 | 19.4 | 6.2 | 2.3 | 0.20 | |
| 120606‐4 | 19.3 | 5.5 | 2.4 | 0.20 | |
| 160112‐4 | 20.3 | 6.2 | 2.4 | 0.20 | |
| 160126‐1 | 16.4 | 3.3 | 2.3 | 0.20 | |
| Q. yabei | 120607‐5 | 9.3 | 3.3 | 1.3 | 0.30 |
| 120607‐6 | 10.5 | 4.9 | 1.3 | 0.32 | |
| 160118‐1 | 4.8 | ‐1.8 | 1.4 | 0.28 | |
| 160126‐2 | 8.3 | 1.1 | 1.5 | 0.26 |
Shading indicates sampling site and period; white: collected from Omaezaki or Minami‐Izu in the daytime, gray: collected from Yugawara in the daytime, dark gray: collected from Yugawara at night.
n.d., not determined.
aRelative to atmospheric nitrogen. bTPGlu/Phe = (δ 15NGlu ‐ δ 15NPhe ‐ 3.4)/7.6 + 1. cPotential uncertainly in TPGlu/Phe calculated with 1σ (0.5) for each value in equation.