Factors influencing the bioaccumulation of persistent organic pollutants in food webs of the Scheldt estuary

[en] Concentrations of several persistent organic pollutants (POPs: PCBs, PBDEs, OCPs) in aquatic species from the Scheldt estuary were related with factors (body size, lipids, trophic position), possibly influencing their bioaccumulation. Stable nitrogen isotope ratios (δ15N) were used as a measure for trophic position. A decreasing trend in POP levels towards the sea was observed. For POP concentrations in sediments, this trend could be attributed to a dilution effect from mixing with seawater. However, concentrations in biota more downstream were higher than expected after taking into account the dilution effect, possibly due to differences in bioavailability. Tissue concentrations were correlated with the lipid content in biota, but not with body size. Biomagnification was only significant for some PCB congeners and p,p'-DDE at the most marine sampling location (Terneuzen, L1) and for p,p'-DDD and BDE 100 at the second sampling location (Bath, L2). A significant decreasing relationship was found for ɣ-HCH concentrations with increasing δ15N at Terneuzen. For Antwerpen (L3), no significant relationships were detected. TMFs ranged from 0.64 for ɣ-HCH up to 1.60 for PCB 194. These results suggest that biomagnification was more important in the marine part of the estuary, although the presence of multiple carbon sources at the freshwater side might have led to an underestimation of the influence of trophic position.

Research center :

MARE - Centre Interfacultaire de Recherches en Océanologie - ULiège

Disciplines :

Aquatic sciences & oceanology

Author, co-author :

Van Ael, Evy

Covaci, Adrian

Das, Krishna ; Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Océanologie

Lepoint, Gilles ; Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Océanologie

Blust, Ronny

Bervoets, Lieven

Language :

English

Title :

Factors influencing the bioaccumulation of persistent organic pollutants in food webs of the Scheldt estuary

Publication date :

2013

Journal title :

Environmental Science and Technology

ISSN :

0013-936X

eISSN :

1520-5851

Publisher :

American Chemical Society, Washington, United States - District of Columbia

Peer reviewed :

Peer Reviewed verified by ORBi

Funders :

F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]

Available on ORBi :

since 13 September 2013

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