Population differences in otolith chemistry have a genetic basis in Menidia menidia

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Abstract:

The number of studies using otolith chemistry as a tool to reconstruct the environmental history of fishes and to detect population structure continues to rise, despite the fact that factors influencing otolith deposition are not fully understood. Many studies have examined the influence of environmental parameters on otolith composition, but none to date have tested the possible influence of intrinsic factors. Using lab broodstock populations, we examined the influence of genetics and temperature on Mg:Ca, Mn:Ca, Sr:Ca, and Ba:Ca concentrations and partition coefficients in the otoliths of juvenile Atlantic silversides, Menidia menidia. Fish from two populations, South Carolina, USA, and Nova Scotia, Canada, were reared in 15, 21, and 27°C. We found significant (p< 0.05) differences in otolith Mg:Ca, Mn:Ca, and Ba:Ca ratios as well as in Mg, Mn, and Ba partition coefficients among populations. Such genetic influences on otolith elemental concentrations have important implications for understanding the physiological mechanisms underlying otolith deposition and enhance the utility of otolith chemistry as a marker of fish population structure in the wild.

Le nombre d’études qui utilisent la chimie des otolithes pour reconstituer l’histoire environnementale des poissons et détecter leur structure démographique ne cesse de croître, même si les facteurs qui influencent la déposition dans les otolithes ne sont pas complètement compris. Plusieurs travaux ont examiné l’influence des variables du milieu sur la composition des otolithes, mais aucun n’a à ce jour vérifié l’influence possible des facteurs intrinsèques. En utilisant des populations de reproducteurs de laboratoire, nous examinons l’influence de la génétique et de la température sur les concentrations de Mg:Ca, Mn:Ca, Sr:Ca et Ba:Ca et les coefficients de partitionnement dans les otolithes chez de jeunes capucettes, Menidia menidia. Nous avons élevé des poissons de deux populations, de Caroline du Sud, É.-U., et de Nouvelle-Écosse, Canada, à 15, 21 et 27 °C. Il existe des différences significatives (p< 0.05) dans les rapports Mg:Ca, Mn:Ca et Ba:Ca et les coefficients de partitionnement de Mg, Mn, et Ba entre les populations. De telles influences génétiques sur les concentrations des éléments dans les otolithes entraînent des conséquences significatives pour la compréhension des mécanismes physiologiques qui sous-tendent la déposition dans les otolithes et augmentent l’utilité de la chimie des otolithes comme marqueur de la structure des populations de poissons en nature.

Document Type: Research Article

Publication date: January 1, 2011

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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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