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Stable isotope compositions of carbon and nitrogen (expressed as  δ  13 C and  δ  15 N) from the European common cuttlefish ( Sepia officinalis ) were measured in order to evaluate the utility of using these natural tracers throughout the Northeast Atlantic Ocean and Mediterranean Sea (NEAO-MS). Mantle tissue was obtained from  S. officinalis  collected from 11 sampling locations spanning a wide geographical coverage in the NEAO-MS. Significant differences of both  δ  13 C and  δ  15 N values were found among  S. officinalis  samples relative to sampling location.  δ  13 C values did not show any discernable spatial trends; however, a distinct pattern of lower  δ  15 N values in the Mediterranean Sea relative to the NEAO existed. Mean  δ  15 N values of  S. officinalis  in the Mediterranean Sea averaged 2.5‰ lower than conspecifics collected in the NEAO and showed a decreasing eastward trend within the Mediterranean Sea with the lowest values in the most eastern sampling locations. Results suggest  δ  15 N may serve as a useful natural tracer for studies on the population structure of  S. officinalis  as well as other marine organisms throughout the NEAO-MS.

royal society open science

Regional patterns ofδ13C andδ15N for European common cuttlefish (Sepia officinalis) throughout the Northeast Atlantic Ocean and Mediterranean Sea