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Effects of temperature and elemental concentration on the chemical composition of juvenile yellow perch (Perca flavescens) otoliths

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Otolith microchemistry studies assume that a relationship exists between the concentration of trace elements in the environment and otolith chemical composition. Although this assumption has been tested using marine and estuarine fish in controlled laboratory experiments, the relationships among temperature, ambient elemental concentration, and otolith chemical composition for freshwater species is not well documented. Here, juvenile yellow perch (Perca flavescens) were reared under different concentrations of four elements (Ba, Mg, Mn, and Sr) crossed with three temperatures (10°C, 15°C, and 20°C) to determine the interactive influence of ambient elemental concentrations and temperature on otolith chemical composition. Sr:Ca and Ba:Ca were significantly related to ambient elemental concentrations, but Mg:Ca and Mn:Ca were not. Although the relative influence of temperature was less than that of ambient elemental concentrations, Sr:Ca, Ba:Ca, and Mn:Ca were all influenced by either water temperature or the interaction between temperature and elemental concentration, but the direction of the temperature effect differed for each element. Patterns in our partition coefficients are consistent with the idea that uptake of strontium facilitates uptake of barium. Overall, yellow perch otolith element composition was influenced primarily by ambient Sr and Ba concentrations, but temperature could potentially confound the results of otolith microchemistry studies.

Les études microchimiques des otolithes présupposent l’existence d’une relation entre la concentration des éléments en trace dans l’environnement et la composition chimique des otolithes. Bien que cette présupposition ait été vérifiée chez des poissons marins et estuariens dans des expériences contrôlées en laboratoire, la relation entre la température, les concentrations ambiantes d’éléments et la composition chimique des otolithes chez les espèces d’eau douce n’a pas été bien établie. Nous avons élevé ici de jeunes perchaudes (Perca flavescens) dans diverses concentrations de quatre éléments (Ba, Mg, Mn et Sr) combinées à trois températures (10°C, 15°C et 20°C) afin de déterminer l’influence interactive des concentrations ambiantes d’éléments et de la température sur la composition chimique des otolithes. Sr:Ca et Ba:Ca sont en relation significative avec les concentrations ambiantes d’éléments, mais Mg:Ca et Mn:Ca ne le sont pas. Bien que l’influence relative de la température soit moindre que celle des concentrations ambiantes d’éléments, Sr:Ca, Ba:Ca et Mn:Ca sont tous influencés ou bien par la température de l’eau ou alors par l’interaction entre la température et la concentration d’éléments, mais le sens de l’effet de la température diffère pour chacun des éléments. Les patrons dans les coefficients de partition obtenus sont compatibles avec la notion que l’incorporation de strontium facilite l’incorporation de barium. De façon globale, la composition des éléments dans les otolithes de perchaudes est influencée principalement par les concentrations ambiantes de Sr et Ba, mais la température pourrait potentiellement fausser les résultats d’études sur la microchimie des otolithes.

Document Type: Research Article

Publication date: July 1, 2010

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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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