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Otolith sulfur isotope method to reconstruct salmon (Oncorhynchus tshawytscha) life history

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Abstract:

We report a new ion microprobe method to reconstruct aspects of fish life history based on sulfur isotopes (34S/32S, expressed as 34S). Selected hatchery raised and naturally spawned juvenile chinook salmon (Oncorhynchus tshawytscha) are shown to have a 12.96 ± 0.27‰ (mean ± 2 standard errors) difference in muscle 34S values, corresponding to 34S differences between the hatchery and freshwater diets. Isotopic microanalyses of otoliths demonstrate that this 13‰ difference is preserved in the otoliths. We interpret the otolith 34S record to be a chronology of dietary 34S, with approximately one-week temporal resolution, preserved in these banded calcium carbonate structures. Potential applications of this method include identifying hatchery raised fish and reconstructing nutrition sources, migration, and other aspects of fish life history.

Une nouvelle méthode qui utilise une microsonde ionique permet de reconstituer certains aspects du cycle biologique d'un poisson à l'étude des isotopes de soufre (34S/32S, soit 34S). De jeunes saumons quinnat (Oncorhynchus tshawytscha) sélectionnés, certains élevés en pisciculture et d'autres nés en nature, présentent des différences de 12,96 ± 0,27‰ (moyenne ± 2 fois l'erreur type) dans les 34S de leurs muscles, ce qui correspond aux différences de 34S entre les régimes alimentaires en pisciculture et en milieu d'eau douce. Des microanalyses des isotopes des otolithes révèlent que cette différence de 13‰ se maintient dans les otolithes. Nous interprétons cet enregistrement du 34S dans les couches de carbonate de calcium des otolithes comme le reflet de l'évolution dans le temps du 34S alimentaire avec une précision de l'ordre de 1 semaine. L'identification des poissons élevés en pisciculture, ainsi que la reconstitution des sources alimentaires, de la migration et d'autres aspects du cycle biologique des poissons sont parmi les applications potentielles de cette nouvelle méthodologie.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: April 1, 2002

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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