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In situ measurement of tissue turnover and energy conversion efficiencies in lake trout (Salvelinus namaycush) using a novel toxicokinetic approach

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Abstract:

We determined polychlorinated biphenyl (PCB) elimination patterns in lake trout (Salvelinus namaycush) from Lake Ontario using biomonitoring data collected from 1977 to 1993. The in situ elimination rates of these persistent pollutants were found to describe tissue turnover rates in lake trout. A model relating tissue turnover rates and endogenous energy conversion efficiencies revealed that chemical elimination in larger organisms is primarily regulated by food limitation and bioenergetic mechanisms rather than chemical kinetics. Lake trout approximately 2500 g and larger were observed to have higher PCB elimination rates than smaller fish as a result of increased lipid mobilization to supplement metabolic demands due to increased time spent foraging. This study concludes that the growth and production of large predators in Lake Ontario are regulated by the bioenergetic constraints of searching for prey in a food-limited environment. We also demonstrate that persistent organic pollutant kinetics can describe the proportion of endogenous energy required to support metabolism and production, thus providing important in situ measurements of bioenergetic processes.

Des données de surveillance biologique de 1977 à 1993 nous ont servi à déterminer les patrons d'élimination des biphényls polychlorés (BPC) chez le touladi (Salvelinus namaycush) au lac Ontario. Les taux d'élimination sur place des ces polluants persistants représentent les taux de remplacement tissulaire chez le touladi. Un modèle qui met en relation les taux de remplacement tissulaire et les efficacités endogènes de conversion énergétique montre que l'élimination chimique chez les organismes de plus grande taille est principalement contrôlée par la limitation de nourriture et les mécanismes bioénergétiques que par la cinétique chimique. Les touladis d'environ 2500 g et de taille supérieure ont des taux d'élimination de BPC plus élevés que les poissons plus petits à cause d'une mobilisation plus forte des lipides pour assurer les besoins énergétiques requis par un temps plus long passé à la recherche de nourriture. Notre étude conclut que la croissance et la production des grands prédateurs dans le lac Ontario sont contrôlées par les contraintes bioénergétiques reliées à la recherche de proies dans un milieu où la nourriture est limitée. Nous démontrons aussi que la cinétique des polluants organiques persistants peut décrire la proportion de l'énergie endogène qui est requise pour supporter le métabolisme et la production, ce qui fournit des mesures in situ des processus bioénergétiques.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: February 1, 2005

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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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