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Jaime Rivera, M., J., Caraveo-Patiño, M., Hoyos-Padilla & F., Galván-Magaña (2014). Feeding and migration habits of white shark Carcharodon carcharias (Lamniformes: Lamnidae) from Isla Guadalupe inferred by analysis of stable isotopes ?15N and ?13C. Revista de Biología Tropical. 62(2): 637-647.

Feeding and migration habits of white shark Carcharodon carcharias (Lamniformes: Lamnidae) from Isla Guadalupe inferred by analysis of stable isotopes ?15N and ?13C

Mario Jaime Rivera, Javier Caraveo-Patiño, Mauricio Hoyos-Padilla y Felipe Galván-Magaña

Stable isotope composition of marine top predator's tissues provides insight information of its trophic ecology and migratory behavior. Previous reports have shown that dermal tissues could record longer patterns of hunting and movement. Based on this, the aim of this study was to describe the feeding and migratory habits of the white shark from Isla Guadalupe, using stable isotopic analysis of dermis. We considered a small subset of many possible prey taxa that the sharks could have eaten throughout their migration: Pinnipeds, squid and tuna. We grouped the data in five focal areas: Gulf of California, Coast of California, Isla Guadalupe, SOFA and Hawaii. We performed a Bayesian mixing model to study the trophic ecology of this top predator. Average isotopic values for dermis tissue of white shark were ?13C (-14.5‰) and ?15N (19.1‰). Corrected white shark dermal mean values to resemble muscle were ?13C (-16.6‰) and ?15N (21.2‰). Mixing model data from dermis showed predation in offshore areas such the SOFA and a main importance of pinnipeds as prey of the white shark in Isla Guadalupe.

Palabras clave: feeding habits; Guadalupe fur seal; Pinnípedos; white shark; mixing models; Pinnipeds

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