Table 1. Isotopic composition of potential white shark prey from different regions of the NEP.
| Carbon | Nitrogen | |||||||||
| ID | Species | Mean | SD | Mean | SD | Lipids | Region | Tissue | N | Reference |
| 1 | Grey whale (Eschrichtius robustus) | −13.1/−15.3 | 0.8 | 14.2 | 0.7 | E | California | Bone collagen | 13 | [120] |
| 2 | Humpback whale (Megaptera novaeangliae) | −16.3 | 1.1 | 14.7 | 1.1 | E | California | Skin | 128 | [121] |
| 3 | porpoise (Phoecena phoecena) | −16.2 | 0.5 | 15.2 | 0.8 | E | California | Muscle | 29 | [122] |
| 4 | California sea lion (Zalophus californianus) | −13.8/−16.0 | 0.9 | 18.6 | 1.0 | E | California | Bone collagen | 15 | [123] |
| 5 | elephant seal (Mirounga angustirostris) | −14.0/−16.2 | 1.0 | 18.2 | 1.0 | E | California | Bone collagen | 24 | [123] |
| 6 | harbor seal (Phoca vitulina) | −12.4/−14.6 | 0.8 | 18.6 | 0.9 | E | California | Bone collagen | 18 | [123] |
| 7 | northern fur seal (Callorhinus ursinus) | −14.5/−16.7 | 0.4 | 18.4 | 0.4 | E | California | Bone collagen | 6 | [124] |
| 8 | Sperm whale (Physeter macrocephalus) | −13.3/−15.5 | 0.5 | 17.5 | 0.5 | E | California | Tooth dentin | 24 | [120] |
| 9 | steller sea lion (Eumetopias jubatus) | −15.2 | 0.5 | 19.8 | 0.6 | E | California | Muscle | 5 | [125] |
| 10 | humpback whale (Megaptera novaeangliae) | −18.0 | 0.9 | 13.0 | 1.4 | E | Hawaii | Skin | 310 | [126] |
| 11 | yellowfin tuna (Thunnus albacares) | −16.5 | 0.4 | 10.2 | 1.8 | E | Hawaii | Muscle | 84 | [127] |
| 12 | purpleback flying squid (Sthenoteuthis oualaniensis) | −17.8 | 0.3 | 12.8 | 1.0 | C | Hawaii | Muscle | 11 | McCauley unpub. data |
| 13 | bigeye tuna (Thunnus obesus) | −16.3 | 0.4 | 11.3 | 0.9 | E | Hawaii | Muscle | 37 | [128] |
| 14 | purpleback flying squid (Sthenoteuthis oualaniensis) | −18.7 | 0.5 | 8.1 | 1.1 | N | Pelagic | Muscle | 156,14* | [129], [130] |
| 15 | blue shark (Prionace glauca) | −17.6 | 0.6 | 16.8 | 0.8 | E | Pelagic | Muscle | 20 | Leaf unpub. data |
| 16 | neon flying squid (Ommastrephes bartrami) | −18.4 | 0.7 | 11.7 | 1.3 | E | Pelagic | Whole animal | 44 | [131] |
| 17 | Pacific pomfret (Brama japonica) | −19.2 | 0.8 | 10.9 | 2.1 | E | Pelagic | Whole animal | 10 | [131] |
| 18 | northern right whale dolphin (Lissodelphis borealis) | −18.7 | 0.2 | 11.8 | 1.9 | E | Pelagic | Unknown | 23 | [131] |
| 19 | bluefin tuna (Thunnus orientalis) | −18.2 | 0.3 | 12.6 | 0.8 | C | Pelagic | Muscle | 32 | Madigan unpub. data |
| 20 | albacore tuna (Thunnus alalunga) | −19.2 | 0.4 | 13.4 | 0.6 | C | Pelagic | Muscle | 14 | Madigan unpub. data |
‘ID’ is the number used to identify this species on Figure 2. For species with values based on collagen, both the reported values and values corrected to reflect muscle are reported respectively. ‘Lipids’ indicates if and how lipids were accounted for in the study (E = extracted, C = mathematically corrected, N: not accounted for), ‘Region’ denotes which focal area the prey are from and ‘N’ is sample size.
*156 squid used in estimating nitrogen, 14 in carbon.