Attributes / relations provided by
♦ ¹Offshore diet of grey seals Halichoerus grypus near Sable Island, Canada, W. D. Bowen, G . D. Harrison, Mar. Ecol. Prog. Ser. 112: 1-11, 1994
♦ ²Feeding habits of bearded seals (Erignathus barbatus) from the Svalbard area, Norway, A. M. Hjelset1, M. Andersen, I. Gjertz, C. Lydersen and B. Gulliksen, Polar Biology, Volume 21, Number 3 / February, 1999, pages 186-193
♦ ³The role of capelin (Mallotus villosus) in the foodweb of the Barents Sea, A. V. Dolgov, ICES Journal of Marine Science, 59: 1034–1045. 2002