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Inter-species differences for polychlorinated biphenyls and polybrominated diphenyl ethers in marine top predators from the Southern North Sea: Part 1. Accumulation patterns in harbour seals and harbour porpoises |
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| Authors: | Weijs Liesbeth Dirtu Alin C Das Krishna Gheorghe Adriana Reijnders Peter J H Neels Hugo Blust Ronny Covaci Adrian |
| Institution: | a Laboratory of Ecophysiology, Biochemistry and Toxicology, Department of Biology, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium b Toxicological Centre, University of Antwerp, Universiteitsplein 1, 2610 Wilrijk, Belgium c Department of Inorganic and Analytical Chemistry, “Al. I. Cuza” University of Iassy, Carol I Bvd. No 11, 700506 Iassy, Romania d Laboratory for Oceanology-MARE Center, University of Liège B6C, 4000 Liège, Belgium e Department of Analytical Chemistry, Faculty of Chemistry, University of Bucharest, Soseaua Panduri 90-92, 050663 Bucharest, Romania f Institute for Marine Resources and Ecosystem Studies, Department of Ecology, PO Box 167, 1790 AD Den Burg, The Netherlands |
| Abstract: | Harbour porpoises (Phocoena phocoena) and harbour seals (Phoca vitulina) are two representative top predator species of the North Sea ecosystem. The median values of sum of 21 polychlorinated biphenyl (PCB) congeners and sum of 10 polybrominated diphenyl ether (PBDE) congeners were 23.1 μg/g lipid weight (lw) and 0.33 μg/g lw in blubber of harbour seals (n = 28) and 12.4 μg/g lw and 0.76 μg/g lw in blubber of harbour porpoises (n = 35), respectively. For both species, the highest PCB concentrations were observed in adult males indicating bioaccumulation. On the contrary, the highest PBDE concentrations were measured in juveniles, likely due to better-developed metabolic capacities with age in adults. A higher contribution of lower chlorinated and non-persistent congeners, such as CB 52, CB 95, CB 101, and CB 149, together with higher contributions of other PBDE congeners than BDE 47, indicated that harbour porpoises are unable to metabolize these compounds. Harbour seals showed a higher ability to metabolize PCBs and PBDEs. |
| Keywords: | PCBs PBDEs Profiles Accumulation Harbour seal Harbour porpoise Marine mammals Southern North Sea |
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