Uptake of sediment-bound bioavailable polychlorobiphenyls by benthivorous carp (Cyprinus carpio).
It is unclear whether accumulation of sediment-bound chemicals in benthivorous fish depends on the degree of sequestration in the sediment like it does for invertebrates. Here, we report on the potential of slow and fast desorbing sediment-bound polychlorobiphenyl (PCB) fractions for accumulation in carp (Cyprinus carpio) in lake enclosures treated with different nutrient doses. Routes of PCB uptake were quantitatively evaluated for 15 PCBs (log Kow range 5.6-7.8) using model analysis. Fast-desorbing PCB fractions in the sediment were defined as the ratio of 6-h Tenax-extractable to (total) Soxhlet-extractable concentrations. These fractions varied between 4 and 22% and did not show a clear trend with log Kow. However, bioaccumulation of PCBs in carp correlated much better with Tenax-extractable concentrations than with total-extractable concentrations. Nutrient additions in the enclosures had a positive effect on PCB accumulation. Model results showthat PCB uptake in carp can be explained from (1) uptake through invertebrate food, (2) uptake from fast-desorbing fractions in ingested sediments, and (3) uptake from water, where PCBs are in partitioning equilibrium with fast-desorbing fractions. The main implication of this research is that fast-desorbing PCB fractions in sediments have great predictive potential for bioaccumulation in benthivorous fish.
Aquatic Ecology and Water Quality Management Group, Wageningen University, P.O. Box 8080, 6700 DD Wageningen, The Netherlands. caroline.moermond@wur.nl
Caroline T A
CT
Moermond
Frank C J M
FC
Roozen
John J G
JJ
Zwolsman
Albert A
AA
Koelmans
D000327:Adsorption; D000818:Animals; D001682:Biological Availability; D002347:Carps / Q000378:metabolism*; D020387:Food Chain; D005618:Fresh Water; D019015:Geologic Sediments / Q000737:chemistry*; D007448:Invertebrates / Q000737:chemistry / Q000378:metabolism; D008954:Models, Biological; D009426:Netherlands; D011078:Polychlorinated Biphenyls / Q000032:analysis* / Q000737:chemistry / Q000378:metabolism; D011108:Polymers; D015203:Reproducibility of Results; D014874:Water Pollutants, Chemical / Q000032:analysis*
D011108:Polymers; D014874:Water Pollutants, Chemical; C010514:tenax; D011078:Polychlorinated Biphenyls