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High Individual Variability in Beak Stable Isotopes of Jumbo Squid off Peruvian Exclusive Economic Zone (EEZ) Waters in the Analysis of Migratory and Foraging Ecology

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Abstract

Stable isotopes (δ13C and δ15N) have been widely used to track cephalopod habitat, migration and trophic structure. In this study, we analyzed the δ13C and δ15N values in 245 Dosidicus gigas beaks collected during 2009–2010 and in 2013 off Peruvian Exclusive Economic Zone (EEZ) waters. High individual variation in beak stable isotopes was shown with values ranging from −19.4‰ to −15.8‰ for δ13C and from 5.0‰ to 15.1‰ for δ15N. A generalized additive model (GAM) showed that latitude, mantle length and distance to shelf break significantly described the isotope variation with deviance ranging from 16.6% in δ13C to 36.3% in δ15N. Large variability in beak δ13C values for a given size and sampling station indicated that D. gigas off the Peruvian EEZ waters migrate in different ways when they occupy a large range of habitats for their ontogeny. Low baseline δ15N values suggested that spatial changes in diet trophic level may be the main determinative factor in beak δ15N variation. We conclude that high variability in beak δ15N values for a given set of explanatory variables indicated that D. gigas is an opportunistic predator with highly diverse dietary habitats. This study further develops our knowledge of the life history of D. gigas in such a highly dynamic region.

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Acknowledgements

Special thanks to the anonymous reviewers for helpful comments on the manuscript. We thank Mrs. Chunxia Gao for the measurement of isotope values and Dr. Christopher J. Somes for sharing baseline isotope data. We thank Dr. Pauline H. Lovell and anonymous English experts, for editing the English text of a draft of this manuscript. This work was sponsored by the Shanghai Pujiang Program (No. 18PJ1404100) and the National Natural Science Foundation of China (Nos. 41306127 and 41276156).

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Liu, B., Jin, Y., Chen, X. et al. High Individual Variability in Beak Stable Isotopes of Jumbo Squid off Peruvian Exclusive Economic Zone (EEZ) Waters in the Analysis of Migratory and Foraging Ecology. J. Ocean Univ. China 18, 232–238 (2019). https://doi.org/10.1007/s11802-019-3749-1

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