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 name	species name	n	δ13C ± s.d.	δ15N ± s.d.	contribution to beluga diet (%)	contribution to Greenland halibut diet (%)
1982–2002
squid	Gonatid sp.	7	−20.3 ± 0.9	11.4 ± 0.9	1 (0–2)	6 (0–18)
					51 (47–55)	—
shrimp	Pandalus borealis	10	−18.7 ± 0.5	13.3 ± 1.0	21 (7–33)	13 (0–38)
					2 (0–6)	—
Arctic cod	Boreogadus saida	8	−19.2 ± 0.5	14.1 ± 1.2	12 (1–29)	79 (55–97)
					5 (0–11)	—
Greenland halibut	Reinhardtius hippoglossoides	14	−19.6 ± 0.7	16.6 ± 0.4	67 (55–78)	—
					42 (37–47)	—
2004–2012
squid	Gonatid sp.	5	−19.8 ± 0.6	11.2 ± 1.3	14 (0–31)	2 (0–8)
					34 (19–48)	16 (5–28)
shrimp	Lebbeus polaris	7	−18.2 ± 0.2	13.9 ± 0.4	8 (0–18)	2 (0–10)
					2 (0–10)	7 (0–21)
Arctic cod/capelin	Boreogadus saida/Mallotus villosus	22	−20.0 ± 0.4	13.7 ± 0.8	35 (3–58)	95 (87–100)
					56 (30–77)	76 (58–92)
Greenland halibut	Reinhardtius hippoglossoides	21	−19.4 ± 0.4	16.4 ± 0.7	42 (27–63)	—
					7 (0–18)	—