Table 2 Stable isotope compositions of blood from red-footed boobies and brown boobies from the Cayman Islands
From: Interspecific and intraspecific foraging differentiation of neighbouring tropical seabirds
| Red-footed boobies | Brown boobies | ||||||
|---|---|---|---|---|---|---|---|
| Isotope ratio | Year | Female | Male | All | Female | Male | All |
| δ15N (‰) | 2016 | 7.8 ± 0.3 (14) | 7.5 ± 0.2 (23) | 7.6± 0.3 (37) | 7.6 ± 0.2 (2) | 7.2 ± 0.1 (9) | 7.3 ± 0.2 (11) |
| 2017 | 7.6 ± 0.2 (13) | 7.3 ± 0.2 (9) | 7.5 ± 0.2 (22) | 7.5 ± 0.1 (8) | 7.1 ± 0.1 (11) | 7.3 ± 0.2 (19) | |
| All | 7.7 ± 0.3 (27) | 7.5 ± 0.2 (32) | 7.6 ± 0.3 (59) | 7.5 ± 0.1 (10) | 7.2 ± 0.1 (20) | 7.3 ± 0.2 (30) | |
| δ13C (‰) | 2016 | −17.1 ± 0.2 | − 17.3 ± 0.1 | − 17.2 ± 0.2 | −17.0 ± 0.1 | − 17.3 ± 0.1 | −17.3 ± 0.2 |
| 2017 | −16.8 ± 0.1 | − 17.0 ± 0.1 | − 16.9 ± 0.1 | −16.3 ± 0.1 | − 16.4 ± 0.1 | −16.4 ± 0.1 | |
| All | −16.9 ± 0.2 | −17.2 ± 0.2 | − 17.1 ± 0.2 | − 16.5 ± 0.3 | − 16.9 ± 0.5 | −16.7 ± 0.5 | |