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Steady and non-steady state kinetics describe polychlorinated biphenyl bioaccumulation in natural populations of bluegill (Lepomis macrochirus) and cisco (Coregonus artedi)

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This study investigated polychlorinated biphenyl (PCB) bioaccumulation patterns across age classes of bluegill (Lepomis macrochirus) and cisco (Coregonus artedi) collected from Sharbot Lake, Ontario. For bluegill, lipid normalized concentrations of PCB congeners of logKow< 6.8 did not demonstrate any significant increases across individuals 2–5years of age. In similarly aged cisco, however, significant age-related increases in lipid normalized PCB concentrations were observed for the majority of these congeners. For PCBs of logKow> 6.8, these congeners demonstrated significant and similar age-related fugacity increases in both species. These patterns indicated that the bioaccumulation of less hydrophobic PCB congeners in bluegill suggest quicker growth kinetics and demonstrate the potential of this species to achieve steady state within their lifetime. In contrast, PCB bioaccumulation patterns in cisco demonstrated that biomagnification and non-steady state kinetics better reflect the capacity of this species to bioaccumulate PCBs. These results demonstrated that for pollutants of logKow< 6.8, growth dilution and age-specific metabolic rates are critical for understanding their bioaccumulation by freshwater fish. However, for increasingly hydrophobic pollutants, their bioaccumulation reflects the biology and ecology of these species in their respective warm- and cold-water habitats.

Nous étudions les patrons de bioconcentration des biphényles polychlorés (BPC) au sein des différentes classes d’âge chez des crapets arlequins (Lepomis macrochirus) et des ciscos de lac (Coregonus artedi) récoltés au lac Sharbot en Ontario. Chez le crapet arlequin, les concentrations normalisées par rapport aux lipides des congénères des BPC de logKow< 6,8 n’affichent aucune augmentation significative parmi les individus d’âges 2–5. Chez les ciscos de lac de même âge, on observe des augmentations significatives en fonction de l’âge des concentrations normalisées de BPC par rapport aux lipides pour la majorité de ces mêmes congénères. Pour les BPC de logKow> 6,8, ces congénères affichent des augmentations significatives de la fugacité reliées à l’âge et semblables chez les deux espèces. Ces patrons indiquent que la bioconcentration des congénères des BPC moins hydrophobes chez les crapets laissent croire à une cinétique de croissance plus rapide et démontrent le potentiel qu’a cette espèce d’atteindre l’état d’équilibre au cours de sa vie. En revanche, les patrons de bioconcentration chez les ciscos de lac démontrent que la bioamplification et une cinétique sans état d’équilibre représentent mieux la capacité de cette espèce à accumuler biologiquement les BPC. Nos résultats démontrent que, pour les polluants de logKow< 6,8, la dilution de la croissance et les taux métaboliques spécifiques à l’âge sont essentiels pour comprendre leur bioconcentration chez les poissons d’eau douce. Cependant, dans le cas des polluants de plus en plus hydrophobes, leur bioconcentration reflète la biologie et l’écologie des espèces dans leurs habitats respectifs d’eau chaude et froide.

Document Type: Research Article

Publication date: December 1, 2009

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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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