Biomagnification of polychlorinated biphenyls in a harbor seal ( Phoca vitulina ) food web from the strait of Georgia, British Columbia, Canada

Abstract Polychlorinated biphenyl (PCB) biomagnification was characterized in a harbor seal food web in the Strait of Georgia, British Columbia, Canada. Trophic magnification factors (TMFs) for PCBs averaged 3.6, with a range of 0.7 to 9.4. The TMFs for individual congeners correlated with log K OW...

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Bibliographic Details
Published in:Environmental Toxicology and Chemistry
Main Authors: Cullon, Donna L., Yunker, Mark B., Christensen, Jennie R., Macdonald, Robie W., Whiticar, Michael J., Dangerfield, Neil J., Ross, Peter S.
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 2012
Subjects:
Health, Toxicology and Mutagenesis
Environmental Chemistry
British Columbia
Canada
harbor seal
Phoca vitulina
Online Access:http://dx.doi.org/10.1002/etc.1963
https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fetc.1963
https://setac.onlinelibrary.wiley.com/doi/pdf/10.1002/etc.1963
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Summary:Abstract Polychlorinated biphenyl (PCB) biomagnification was characterized in a harbor seal food web in the Strait of Georgia, British Columbia, Canada. Trophic magnification factors (TMFs) for PCBs averaged 3.6, with a range of 0.7 to 9.4. The TMFs for individual congeners correlated with log K OW ( r 2 = 0.56, p < 0.001), reflecting the role that physicochemical properties play in driving the biomagnification of PCBs in marine food webs. However, TMFs differed among PCB structure activity groups, clearly indicating an additional role for metabolic transformation of certain PCBs. The known feeding preferences of harbor seals enabled the calculation of trophic level‐adjusted biomagnification factors (BMF TL ) for PCBs in this species, which averaged 13.4 and ranged from 0.2 to 150.6. Metabolic transformation in seals explained some of the variation in congener‐specific biomagnification, with lower BMF TL values for PCB congeners with meta‐ and parachlorine unsubstituted positions. Principal components analysis revealed the distinct roles played by trophic level, log K OW , and metabolic transformation in explaining the notable differences in PCB patterns among harbor seals, their pups, and their prey. In the present study, the authors estimate there to be approximately 76 kg of PCBs in the biota of the Strait of Georgia, of which 1.6 kg is retained by harbor seals. Environ. Toxicol. Chem. 2012; 31: 2445–2455. © 2012 SETAC

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