Attributes / relations provided by
♦ ¹Feeding ecology and trophic level of the banded guitarfish, Zapteryx exasperata, inferred from stable isotopes and stomach contents analysis, María-del-Pilar Blanco-Parra, Felipe Galván-Magaña, J. Fernando Márquez-Farías, Carlos Alberto Niño-Torres, Environmental Biology of Fishes, September 2012, Volume 95, Issue 1, pp 65-77
♦ ²Occurrence, photo-identification and prey of Pacific white-sided dolphins (Lagenorhyncus obliquidens) in the Broughton Archipelago, Canada 1984-1998, Alexandra Morton, Marine Mammal Science Vol. 16, no. 1, pp. 80-93. Jan 2000
♦ ³Food 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