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Modeling cadmium uptake from water and food by the freshwater bivalve Pyganodon grandis

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For this study, the unionid bivalve Pyganodon grandis was either exposed to dissolved cadmium (Cd) or fed Cd-contaminated algae (Pseudokirchneriella subcapitata) during short-term laboratory experiments. Cadmium accumulated largely in the digestive gland after a dietary exposure, or in the gills after an aqueous exposure; in these latter experiments, Cd accumulation from the dissolved phase increased as bivalve filtration rates increased. The results of these uptake experiments were used to parameterize a biodynamic model, which was then used to estimate the relative importance of water and food as sources of Cd for this bivalve, and to predict steady state Cd concentrations in the gills and digestive gland of native bivalves. In comparisons between the simulations and data obtained from earlier field studies on P.grandis, the model adequately predicted Cd concentrations in P. grandis gills, except in Ca-rich lakes, whereas it tended to overestimate Cd concentrations in the digestive gland. The field simulations indicate that water is the main source of Cd for both the gills (relative importance water:food::99:1) and the digestive gland (water:food::80:20). These results will facilitate the interpretation of spatial and temporal variations in Cd concentrations in free-living P. grandis, which is a promising metal biomonitor.

Des bivalves unionidés Pyganodon grandis ont été ou bien exposés à du cadmium (Cd) dissous ou alors nourris d'algues (Pseudokirchneriella subcapitata) contaminées au cadmium lors d'expériences de courte durée en laboratoire. Le cadmium s'accumule en grande partie dans la glande digestive après une exposition alimentaire ou dans les branchies après une exposition dans l'eau; dans ces dernières expériences, l'accumulation de Cd à partir de la phase aqueuse croît en fonction de l'augmentation des taux de filtration du bivalve. Les résultats de ces expériences d'accumulation ont servi à déterminer les paramètres d'un modèle biodynamique qui a ensuite permis d'estimer les importances relatives de l'eau et de la nourriture comme sources de Cd chez ce bivalve et à prédire les concentrations de Cd à l'état d'équilibre dans la glande digestive et les branchies des bivalves indigènes. Lors de comparaisons entre les simulations et des données obtenues d'études antérieures en nature sur Pyganodon grandis, le modèle prédit de manière adéquate les concentrations de Cd dans les branchies, excepté dans les lacs riches en Ca, alors qu'il a tendance à surestimer les concentrations de Cd dans la glande digestive. Les simulations en nature indiquent que l'eau est la source principale de Cd, tant dans les branchies (importances relatives eau : nourriture :: 99:1) que dans la glande digestive (eau : nourriture :: 80:20). Ces résultats vont faciliter l'interprétation des variations spatiales et temporelles des concentrations de Cd en nature chez P. grandis, un indicateur biologique des métaux prometteur.

Document Type: Research Article

Publication date: November 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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