Attributes / relations provided by
♦ ¹NOAA, Great Lakes Environmental Research Laboratory
♦ ²Food 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
♦ ³Diet of the Double-Crested Cormorant in Western Lake Erie, Michael T. Bur, Sandra L. Tinnirello, Charles D. Lovell, Jeff T. Tyson, USDA National Wildlife Research Center Symposia, 1997