Bioaccumulation of polychlorinated dibenzo-p-dioxins, dibenzofurans, and dioxin-like polychlorinated biphenyls in fishes from the Tittabawassee and Saginaw Rivers, Michigan, USA.
Characterizing biological factors associated with species-specific accumulation of contaminants is one of the major focuses in ecotoxicology and environmental chemistry studies. In this study, polychlorinated dibenzo-p-dioxins (PCDDs), dibenzofurans (PCDFs), and non- and mono-ortho-substituted polychlorinated biphenyl (PCB) congeners were analyzed in various fish species from the Tittabawassee and Saginaw Rivers (12 fish species; n=314 individuals), Michigan, USA. Due to their migratory habits, greater delta(13)C stable isotope values were found in walleye and white sucker among 12 fish species. Meanwhile, the delta(15)N values indicated that the trophic status was least in carp and greatest in largemouth bass. The greatest total concentrations of dioxins were found in fishes with the lowest trophic status (carp (n=50) followed by channel catfish (n=49)), and concentrations of SigmaPCDD/Fs (20-440pg/g ww (wet weight)), SigmaPCBs (16-690ng/g ww), and TEQs (6.8-350pg/g ww) in carp were also greater than the least mean concentrations in other fishes. Contributions of various biological factors to the species accumulation were assessed. Body weight and lipid content were found to be the most significant factors influencing accumulation of SigmaPCDD/Fs. Lipid content and trophic level seemed to be dominant factors determining accumulation of SigmaPCB and TEQs, but negative correlations between trophic status and concentrations of SigmaPCBs and TEQs were observed possibly due to the great concentrations in benthivorous fishes such as carp occupying lower trophic levels. These factors can be used to predict the contaminant levels of dioxins and health risks of the fishes in the river ecosystem.
Wan
Yi
Y
Department of Veterinary Biomedical Sciences and Toxicology Centre, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 5B3. yi.wan@usask.ca
Jones
Paul D
PD
Holem
Ryan R
RR
Khim
Jong Seong
JS
Chang
Hong
H
Kay
Denise P
DP
Roark
Shaun A
SA
Newsted
John L
JL
Patterson
William P
WP
Giesy
John P
JP
D000818:Animals; D001572:Benzofurans / Q000032:analysis / Q000378:metabolism*; D002247:Carbon Isotopes; D004781:Environmental Exposure / Q000032:analysis; D004784:Environmental Monitoring; D005399:Fishes / Q000378:metabolism*; D020387:Food Chain; D008824:Michigan; D009587:Nitrogen Isotopes; D000072317:Polychlorinated Dibenzodioxins / Q000031:analogs & derivatives* / Q000032:analysis / Q000378:metabolism*; D045483:Rivers / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000378:metabolism*
D001572:Benzofurans; D002247:Carbon Isotopes; D009587:Nitrogen Isotopes; D000072317:Polychlorinated Dibenzodioxins; D014874:Water Pollutants, Chemical