PARENT SESSION
PW13 - Trophic Transfer
Wednesday, 20 November 2002
8:00 AM to 6:30 PM
Exhibit Hall
(P869) Body burden and toxic equivalents (TEQs) of polychlorinated dibenzo-p-dioxins, dibenzofurans and bipheyls in the round goby and smallmouth bass .
Kwon, Tae-Dong*,1,2, Fisher, Susan1, Kim, Jang-Eok2, 1 The Ohio State University, Dept. of Entomology, Columbus, OH2 Kyungpook National University, Dept. of Agricultural Chemistry, Daegu, Rep.of Korea
ABSTRACT- Concentrations of polychlorinated dibenzo-p-dioxins (PCDDs), dibenzofurans (PCDFs), biphenyls (PCBs), and 2,3,7,8-tetrachlorodibenzo-p-dioxin equivalents (TEQs) were determined in round goby (RG) and smallmouth bass (SB) from the Lake Erie drainage basin. Mean concentrations of total PCDD/Fs and TEQ ranged from 11.868 to 31.675 and 10.514 to 31.676 pg/g in RG, from 26.616 to 208.30 and 20.999 to 91.306 pg/g in the head of smallmouth bass (SBH), and from 45.248 to 217,54 and 29.122 to 76.984 pg/g in smallmouth bass tissue, wet weight, respectively. Concentrations of total PCDD and TEQ between species were not significantly different, but total PCDF was significant. The lipid-normalized trophic transfer factor (TTFlip) values in both RG and SB of total PCDD were not significantly different compared to PCB and PCDF. It suggests that total PCDD has little potential of accumulating through the RG and SB food web. The percentage of TEQ contributed by PCDD, PCDF, and PCB was significantly different. The highest contributor of these congeners was 2,3,7,8-tetrachlorodibenzo-p-dioxin while 2,3,7,8-tetrachlorodibenzofuran showed the highest concentration in the Grand River harbor. Concentrations of total PCB and total PCDF or TEQ were significant, but poorly correlated ( r2=0.07 and 0.06 in total PCDF vs PCB and TEQ vs PCB, respectively).
Key words: TEQs, Trophic transfer, PCDD/F, Smallmouth bass