Table 2.

Mean of δ13C and δ15N (‰) for potential prey items and their median contribution (95% Bayesian credible interval) to beluga and Greenland halibut diet by time-period. Bold font represents dietary estimates derived from beluga skin and Greenland halibut liver.

common namespecies namenδ13C ± s.d.δ15N ± s.d.contribution to beluga diet (%)contribution to Greenland halibut diet (%)
1982–2002
squidGonatid sp.7−20.3 ± 0.911.4 ± 0.91 (0–2)6 (0–18)
51 (47–55)
shrimpPandalus borealis10−18.7 ± 0.513.3 ± 1.021 (7–33)13 (0–38)
2 (0–6)
Arctic codBoreogadus saida8−19.2 ± 0.514.1 ± 1.212 (1–29)79 (55–97)
5 (0–11)
Greenland halibutReinhardtius hippoglossoides14−19.6 ± 0.716.6 ± 0.467 (55–78)
42 (37–47)
2004–2012
squidGonatid sp.5−19.8 ± 0.611.2 ± 1.314 (0–31)2 (0–8)
34 (19–48)16 (5–28)
shrimpLebbeus polaris7−18.2 ± 0.213.9 ± 0.48 (0–18)2 (0–10)
2 (0–10)7 (0–21)
Arctic cod/capelinBoreogadus saida/Mallotus villosus22−20.0 ± 0.413.7 ± 0.835 (3–58)95 (87–100)
56 (30–77)76 (58–92)
Greenland halibutReinhardtius hippoglossoides21−19.4 ± 0.416.4 ± 0.742 (27–63)
7 (0–18)