Congener-specific accumulation and trophic transfer of polychlorinated biphenyls in spider crab food webs revealed by stable isotope analysis.
Polychlorobiphenyls (PCB) and stable isotopes (delta15N and delta13C) were analyzed in the spider crab (Maja brachydactyla) food web from the Iroise Sea (Western Brittany) and the Seine Bay (Eastern English Channel). PCB concentrations were all significantly higher in organisms from the Seine Bay than those from the Iroise Sea. PCB patterns were strongly related to the feeding mode of the species, and increased influence of higher chlorinated congeners was highlighted with trophic position of the organisms. PCB concentrations (lipid normalized) were significantly related to the isotopically derived trophic level (TL) in spider crab food webs. The highest trophic magnification factors (TMFs) were calculated for the congeners with 2,4,5-substitution, and were lower in the Seine Bay compared to the Iroise Sea. The confrontation of PCB and TL data also revealed biotransformation capacity of decapod crustaceans for specific congeners based on structure-activity relations.
Bodin
N
N
IFREMER, DCN-BE, Technopôle Brest-Iroise, Pointe du Diable, 29280 Plouzané, France. bodin.nathalie@caramail.com
Le Loc'h
F
F
Caisey
X
X
Le Guellec
A-M
AM
Abarnou
A
A
Loizeau
V
V
Latrouite
D
D
D000818:Animals; D049872:Bivalvia; D002247:Carbon Isotopes; D033364:Decapoda / Q000378:metabolism*; D004447:Echinodermata; D004784:Environmental Monitoring / Q000379:methods*; D056890:Eukaryota; D020387:Food Chain; D005602:France; D049851:Gastropoda; D005843:Geography; D009587:Nitrogen Isotopes; D011078:Polychlorinated Biphenyls / Q000032:analysis* / Q000737:chemistry; D013329:Structure-Activity Relationship; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry; D015048:Zooplankton
D002247:Carbon Isotopes; D009587:Nitrogen Isotopes; D014874:Water Pollutants, Chemical; D011078:Polychlorinated Biphenyls