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This research was supported in part by NSF grant OCE-77-27009. We thank Dr. B. Fry for providing many of the shrimp samples and Dr. M. Estep for critical comments on the manuscript. We thank the Captain and Crew of the R.V. Longhorn for help in the collection of these samples. Contribution number 626 from the University of Texas, Port Aransas Marine Laboratory.
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Macko, S.A., Entzeroth, L. & Parker, P.L. Regional differences in nitrogen and carbon isotopes on the continental shelf of the Gulf of Mexico. Naturwissenschaften 71, 374–375 (1984). https://doi.org/10.1007/BF00410746
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DOI: https://doi.org/10.1007/BF00410746