Attributes / relations provided by
♦ ¹Food Web Relationships of Northern Puget Sound and the Strait of Juan de Fuca : a Synthesis of the Available Knowledge, Charles A. Simenstad, Bruce S. Miller, Carl F. Nyblade, Kathleen Thornburgh, and Lewis J. Bledsoe, EPA-600 7-29-259 September 1979
♦ 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