Assessing the trophic ecology of three sympatric squid in the marine ecosystem off the Patagonian Shelf by combining stomach content and stable isotopic analyses
2016
Rosas-Luis, R. (Rigoberto) | Navarro, J. (Joan) | Sánchez, P. (Pilar) | Río-Iglesias, J.L. (José Luis) del
anglais. Squid species are important components of the Southern Atlantic Ocean ecosystems, as theyprey on a wide range of crustaceans, fish and cephalopods. As a result of this trophicinteraction and their high abundance, they are considered reliable indicators of energytransfer and biomass in the food web. We identified Illex argentinus, Doryteuthis gahi andOnykia ingens as the most important squid species interacting on the Patagonian shelf, andused isotope analysis and stomach content identification to assess the feeding ecology andinteraction of these squids in the ecosystem. Our results describe trophic interactions bydirect predation of O. ingens and I. argentinus on D. gahi, and a trophic overlap of the threesquid, and indicate a higher trophic level and differences in the foraging areas for matureand maturing D. gahi inferred through δ15N and δ13C concentrations. These differences wererelated to the segregation and different habitat of large mature D. gahi and suggest a foodenrichment of C and N based on feeding sources other than those used by small maturingD. gahi and I. argentinus and O. ingens.
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