Table 1. Species studied.

Species	Description and source	Years
Black-legged kittiwake Rissa tridactyla	Regurgitation of 653 adults on the breeding colony Kharlov Island on the coast of the Barents Sea (BS) during the breeding season (April-May).	1982–1999 (lacking data for 1984 and 1985)
Common guillemot Uria aalge	Observation of 1951 fish deliveries at the breeding colony Kharlov Island on the coast of the BS during the breeding season (April-May).	1984–1999 (lacking data for 1985)
NEA cod Gadus morhua	Stomach content a , b. To compare with the seabirds we used data for 68–72°N and 20–40°E only (Mar-July) and to compare with the whale data for 70–80°N and 5–40°E (July-Sept). c	1984–2009
Minke whale Balaenoptera acutorostrata	Stomach content of 345 whales caught in the BS between May-Sept. To compare with the seabirds a subset for the area <75°N was used. d	1992–2004

^aReport of the ICES Arctic Fisheries Working Group [61], Table 1.3 p 55.

^bThe Russian-Norwegian data base on cod diet, further details see Mehl and Yaragina [31], and Dolgov et al. [30]

^cthe subsets from this base.

^dFurther details on the capture and the stomach sampling is given in Haug et al. [62]