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Tracking habitat and resource use for the jumbo squid Dosidicus gigas: a stable isotope analysis in the Northern Humboldt Current System

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Abstract

To determine the habitat and resource use of Dosidicus gigas in the Northern Humboldt Current System, we analysed carbon and nitrogen stable isotopes of 234 individuals collected during 2008–2010. Large variations in mantle stable isotope ratios were recorded, with values ranging from −19.1 to −15.1 ‰ (δ13C) and from 7.4 to 20.5 ‰ (δ15N). Most of the variation was explained by latitude, followed by distance to shelf break for carbon and by squid size for nitrogen. Latitudinal variations with increasing values from north to south were also found in zooplankton samples and were related to changes in isotope baseline values probably due to oxygen minimum zones that occur off Peru. This similar latitudinal trend in both zooplankton and D. gigas samples reveals that D. gigas is a relatively resident species at the scale of its isotopic turnover rate (i.e. a few weeks), even if this is not necessarily the case at the scale of its life. A small but significant size effect on δ13C values suggests that jumbo squid perform offshore–onshore ontogenic migration, with juveniles distributed offshore. For nitrogen, the high inter-individual variability observed with mantle length indicates that D. gigas can prey on a high variety of resources at any stage of their life cycle. This large-scale study off the coast of Peru provides further evidence that D. gigas have the capability to explore a wide range of habitats and resources at any stage of their life.

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Acknowledgments

The authors sincerely thank the technical staff from Peruvian Marine Research Institute who collected the samples onboard research and commercial vessels during the study. We are grateful to J. M. Munaron for help in stable isotope sample preparation, G. Guillou and P. Richard for stable isotope analyses and F. Keyl for helpful comments. This work is a contribution of the cooperation agreement between Peruvian Marine Research Institute and Institut de Recherche pour le Développement and of the LMI DISCOH. This publication was made possible through support provided by IRD and IRD–DSF.

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Authors and Affiliations

  1. Instituto del Mar del Perú Esq. Gamarra y Gral Valle s/n Chucuito, Callao, Lima, Peru

    Juan Argüelles, Michelle Graco, Ricardo Tafur, Ana Alegre, Pepe Espinoza, Anatolio Taipe & Patricia Ayón

  2. IRD, UMR 6539 CNRS/IRD/UBO LEMAR, BP 70, 29280, Plouzané, France

    Anne Lorrain

  3. Centre d’Etudes Biologiques de Chizé, UPR 1934 du CNRS, BP 14, 79360, Villiers-en-Bois, France

    Yves Cherel

  4. IRD, UMR212 EME, IFREMER/IRD/UM2, Av. Jean Monnet, BP 171, 34203, Sète, France

    Arnaud Bertrand

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  1. Juan Argüelles
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  2. Anne Lorrain
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  3. Yves Cherel
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Correspondence to Juan Argüelles.

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Argüelles, J., Lorrain, A., Cherel, Y. et al. Tracking habitat and resource use for the jumbo squid Dosidicus gigas: a stable isotope analysis in the Northern Humboldt Current System. Mar Biol 159, 2105–2116 (2012). https://doi.org/10.1007/s00227-012-1998-2

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