Isotopic reconstruction of marine food webs using cephalopod beaks: new insight from captively raised Sepia officinalis

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Tissue, ontogenic and sex-related differences in δ13C and δ15N values of the oceanic squid Todarodes filippovae (Cephalopoda: Ommastrephidae) (2009, unknown): “The »3‰ range in 15N values within maturity stages of T. Wlippovae is quite large, and corresponds to one trophic level (Minagawa and Wada 1984; Hobson and Cherel 2006).”
Stable isotopes reveal the trophic position and mesopelagic fish diet of female southern elephant seals breeding on the Kerguelen Islands (2008, background): “Mar Ecol Prog Ser 329:281–287 Cherel Y, Pütz K, Hobson KA (2002) Summer diet of king penguins (Aptenodytes patagonicus) at the Falkland Islands, southern Atlantic Ocean.”
Future challenges in cephalopod research* (2014, background): “For example, d13C and d15N values of the tip of the wings and anterior tip of the gladius (i.e. the most recently synthesized parts of lower beaks and gladii, respectively) integrate the feeding ecology prior to capture (Cherel & Hobson, 2005; Hobson & Cherel, 2006; Cherel et al., 2009a).”
Isotopic niches of emperor and Adélie penguins in Adélie Land, Antarctica (2008, background): “Like other cephalopod species ( Hobson and Cherel 2006 ), P. glacialis has much higher 15N values in muscle than in chitinized beaks”