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Relating otolith chemistry to surface water chemistry in a coastal plain estuary

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Abstract:

Although laboratory studies confirm that otoliths incorporate trace elements and stable isotopes from surrounding waters, few studies explore the relationship of otolith chemistry to water chemistry in the field and none include a larger suite of environmental tracers, such as rare earth elements. Using spotted seatrout (Cynoscion nebulosus) as model species, we tested the hypothesis that otoliths record the water chemistry of seagrass habitats in Chesapeake Bay. In summer 2001, we sampled water and juvenile fish in seagrass beds of the bay. Weighted linear regressions showed that [Ba/Ca]otolith and [La/Ca]otolith were best predicted by salinity and were modeled as [Ba/Ca]otolith (µmol·mol–1) = –2.25 ± 0.35 × salinity + 59.47 ± 7.01) and [La/Ca]otolith (pmol·mol–1) = –8.71 ± 0.65 × salinity + 243.87 ± 12.52. [Ba/Ca]otolith increased with [Ba/Ca]water, but the relationship was nonlinear. Salinity did not influence [Mn/Ca]otolith, but this ratio was positively correlated with [Mn/Ca]water. Although the partition coefficient of Sr (DSr = 0.23 ± 0.019) was similar to that in laboratory experiments, [Sr/Ca] in waters and otoliths was decoupled despite equal temperature exposure, suggesting that [Sr/Ca]otolith concentration may not be a simple function of water composition. However, there was a predictive relationship between [18O]otolith and [Sr/Ca]water ([18O]otolith = 1.18 ± 0.09 × [Sr/Ca]water (mmol·mol–1) – 14.286 ± 0.78) resulting from mixing between fluvial and oceanic waters. Water chemistry showed mixed values as a proxy for otolith chemistry and may not be a surrogate for otolith chemistry in wide estuaries.

Bien que les études en laboratoire confirment que les otolithes accumulent les éléments en trace et les isotopes stables à partir du milieu aquatique environnant, peu d'études examinent la relation entre la chimie des otolithes et la chimie de l'eau en nature; aucune n'inclut un éventail élargi de traceurs environnementaux, tels que les éléments de terres rares. Utilisant l'acoupa royal (Cynoscion nebulosus) comme espèce modèle, nous vérifions l'hypothèse selon laquelle les otolithes reflètent la chimie des habitats d'herbes marines dans la baie de Chesapeake. À l'été 2001, nous avons échantillonné l'eau et les jeunes poissons dans les herbiers à herbes marines dans la baie. Des régressions linéaires pondérées montrent que [Ba/Ca]otolithes et [La/Ca]otolithes sont le mieux prédites par la salinité, selon les modèles [Ba/Ca]otolithes (µmol·mol–1) = –2,25 ± 0,35 × salinité + 59,47 ± 7,01 et [La/Ca]otolithes (pmol·mol–1) = –8,71 ± 0,65 × salinité + 243,87 ± 12,52. [Ba/Ca]otolithes augmente en fonction de [Ba/Ca]eau, mais la relation n'est pas linéaire. La salinité n'influence pas [Mn/Ca]otolithes, mais ce rapport est en corrélation positive avec [Mn/Ca]eau. Bien que le coefficient de partition de Sr (DSr = 0,23 ± 0,019) soit semblable à celui observé dans les expériences de laboratoire, les [Sr/Ca] des eaux et des otolithes sont dissociées malgré une exposition semblable à la température, ce qui laisse croire que [Sr/Ca]otolithes puisse ne pas être une fonction simple de la composition de l'eau. Il existe cependant une relation prédictive entre [18O]otolithes et [Sr/Ca]eau selon la formule [18O]otolithes = 1,18 ± 0,09 × [Sr/Ca]eau (mmol·mol–1) – 14,286 ± 0,78, relation qui résulte du mélange des eaux fluviales et océaniques. La chimie de l'eau sert de façon inégale comme variable de rechange de la chimie des otolithes et peut ne pas être un remplacement valable pour la chimie des otolithes dans les estuaires de grande largeur. [Traduit par la Rédaction]

Document Type: Research Article

Publication date: March 1, 2007

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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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