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Title of Journal: Anal Bioanal Chem

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Abbravation: Analytical and Bioanalytical Chemistry

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Springer-Verlag

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10.1007/s10587-008-0035-6

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1618-2650

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Temperature dependency of element incorporation in

Authors: Lasse Marohn Volker Hilge Karsten Zumholz Andreas Klügel Heike Anders Reinhold Hanel
Publish Date: 2010/11/24
Volume: 399, Issue: 6, Pages: 2175-2184
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Abstract

The present study experimentally tested the influence of water temperature on the inclusion of 15 elements into juvenile European eel Anguilla anguilla otoliths in freshwater It should be investigated 1 if temperature effects on otolith Sr/Ca might impair the interpretation of migration studies and 2 if the elemental composition of otoliths can be used to reconstruct experienced temperature histories of eels Therefore eels were kept under full experimental conditions at three different water temperatures 14 °C 19 °C and 24 °C for 105 days Thereafter laser ablation inductively coupled mass spectrometry LAICPMS was conducted on the outer edge of their otoliths Our analyses revealed significant temperature effects on otolith Na/Ca Sr/Ca Mg/Ca Mn/Ca Ba/Ca Zr/Ca and Y/Ca ratios Variations of Sr/Ca caused by temperature were far below those used to detect eel movements between waters of different salinities and will therefore not affect the interpretation of migration studies Elemental fingerprints of Sr/Ca Mg/Ca Mn/Ca and Ba/Ca ratios resulted in clearly separated groups according to temperature treatments indicating that changes in water temperature might lead to characteristic changes in otolith element composition However the successful application of elemental fingerprints to reconstruct moderate changes of water temperature seems doubtful because the influence of somatic growth on otolith microchemistry still remains unclear and temperatureinduced variations could be overlaid by changes of water element concentrations during growth periods Nevertheless our results contribute to the completion of knowledge about factors influencing element incorporation and help to explain variations in element composition of fish otolithsWe thank one anonymous reviewer for his helpful comments Andreas Drahotta is acknowledged for the construction and maintenance of the rearing system the daily feeding of eels and his invaluable help during Alizarin marking We also thank Nina Bergmann for statistical advice Festus Nashima for his help during otolith preparation and Andrea Frommel for proofreading This study was funded by the German Federal Ministry of Consumer Protection Food and Agriculture BMELV through the project “Habitat selection of the European eel” 04HS065

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