DOI 10.1007/s00227-008-1121-xORIGINAL PAPER Tissue, ontogenic and sex-related diVerences in 13C and 15N values of the oceanic squid Todarodes Wlippovae (Cephalopoda: Ommastrephidae)

Abstract Stable isotopes are increasingly used in the study of trophic interactions of many aquatic animals and most recently cephalopods. To evaluate the application of the method to squids, it is important to assess isotopic diVerences among and within consumer tissues that may confound the resolution of ecological relationships. Inter-and intra-tissue isotopic variation was examined in 55 indi-viduals of the oceanic squid Todarodes Wlippovae that were collected at the beginning of April 2000 in the southwester